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The as-extruded Mg-xLi-3Al-1Zn (x = 1, 3, 5; wt%) sheets (LAZ131, LAZ331 and LAZ531 respectively) were performed with different reductions in multi-pass cold-rolling process. The changed mechanical behaviors of cold-rolled AZ31 alloys with Li additions were investigated via the electron-backscattered diffraction (EBSD) and texture. The results indicated that the main deformation modes of LAZ131 alloy were twinning and basal slip during cold rolling process. However, for the LAZ331 and LAZ531 alloy, the prismatic slip, { 11 2 2 } pyramidal slip, {10 1 2} extension twining, {10 1 1} contraction twinning sequentially dominated in the deformation with increased rolling reduction. Then, the theoretical critical shear strength ( τ max ) (reflecting the critical resolved shear stress, CRSS) of Mg and Mg-Li crystal was characterized by first-principles calculation. The direct consequences from calculations indicated that the value of τ max decreased from 1571 MPa to 1276 MPa in pyramidal slip systems, while that increased from 114 MPa to 177 MPa in basal slip, due to doping Li to Mg single crystal. The decrease in τ max ratio between non-basal and basal may promote an easy activation of non-basal slip and show different deformation modes of cold-rolled AZ31 alloys with different Li additions.

To investigate the deformation behavior of Mg-X(X=Zn, Y) binary solid solution, the strain-stress curve of crystal cell along [0001] for Mg-1.85at.%X(X=Zn, Y) alloy were simulated using first-principles calculations in this study. The simulation presents directly the critical resolved shear stress for pyramidal plane slip systems for Mg-1.85at.%X(X=Zn, Y) alloy. The results show that the minimum critical resolved shear stress (CRSS) of Mg, Mg-1.85at. %Zn and Mg-1.85at. %Y for pyramidal plane slip systems is 2.24, 2.72, 2.96 GPa respectively.

Photocatalyst coatings on alumina (Al2O3) balls had been successfully fabricated by mechanical coating technique, with titanium carbide (TiC) powder and subsequent heat treatment in carbon powder. The effect of heat treatment conditions in carbon powder on the formed compounds, surface morphology and photocatalytic activity of photocatalyst coatings was investigated. XRD results show that the formed compounds change with increasing the heat treatment temperature in carbon powder, and rutile TiO2 on the surface of TiC coatings at 1073 K and 1173 K. The generated oxygen vacancies confirmed by XPS measurement, are in favor of narrowing band gap to enhance the visible-light photocatalytic activity of photocatalyst coatings. The photocatalytic activity of photocatalyst coatings has been effectively enhanced, and the samples fabricated at 1073 K and 1173 K for 2 h show higher activity. The fabrication strategy provides us a facile preparation procedure of visible-light responsive photocatalyst coatings.

The microstructures, texture and mechanical behaviors of as-extruded Mg- x Li sheets ( x = 1, 2, 3; wt%) were investigated by the optical microscope, X-ray diffraction (XRD), electron back scattered diffraction (EBSD) and uniaxial tension test. The results showed that the as-extruded Mg-3Li sheet possessed a bimodal microstructure with two different grain sizes of 9.6 µm and 3.7 µm, respectively. Even the coarse grains of Mg-3Li were finer than the grains of Mg-(1,2)Li sheets. Meanwhile, the as-extruded Mg-3Li sheet showed higher strength and ductility compared to other two sheets. Especially, as the Li content increased from 2 wt% to 3 wt%, the ultimate tensile strength (UTS), the elongation to failure and the strain hardening exponent ( n -value) along the transverse direction (TD) were enhanced by ~ 16%, 70% and 17%, respectively. The macro-texture and the orientation distribution characteristic implied that large amounts of prismatic and pyramidal slips were activated in the Mg-3 Li alloy during the extrusion process, while only basal slip was observed in the Mg-(1,2) Li alloys. The non-basal slips led to more potential nucleation sites and a better coordination for the deformation, resulting in the bimodal fine microstructure and better comprehensive mechanical properties of the as-extruded Mg-3Li sheet.

The influence of cooling rate (1.5, 0.3 and 0.1 °C/s) on the hot tearing susceptibility (HTS) of Mg-9Al-1Zn-0.8Ce alloy was investigated by taking advantage of numerical simulation and experimental methods. Filling and solidification processes were observed directly using AnyCasting software. The results demonstrated that the reduction of cooling rate increases the residual melt modulus, deteriorate strain and stress concentration at last stage of solidification, and decrease the hot tearing resistance of alloy finally. The maximum value of HTS was obtained at the average cooling rate of 0.1 °C/s owing to the coarse microstructures and bulk Al11Ce3. The minimum value of HTS appeared at the rate of 1.5 °C/s thanks to the finest microstructures and a large amount of eutectic. With the increase of cooling rate, hot tearing susceptibility of the alloy shows a rapid reduction at beginning, and a slow decline followed. Besides, morphology of fracture surface and distribution of secondary phase were further discussed.

Mg-5Y-3Ni-0.2Zr (wt. %) and Mg-5Y-3Zn-0.2Zr (wt. %) alloys with LPSO structure have been designed and fabricated. The microstructure and mechanical property of both the extruded alloys have been comparatively studied. The results showed that the alloy with enough Ni exhibited higher elongation due to the high volume fraction of LPSO structure with excellent compatible deformation capability. The presence of deformation kinks with high kink angle demonstrated the capability of LPSO structure to accommodate the deformation, which could greatly increase the ductility and the toughness of the alloy.

Spherical Sm2O3 nanoparticles have been successfully synthesized by microwave-assisted hydrothermal technique in the condition of different microwave radiation power. The microstructure, morphology and optical properties of the samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), field emission transmission electron microscope (FETEM) and ultraviolet-visible (UV-vis) spectrophotometry. The results showed that the precursors Sm (OH)3 nanorods and SmOHCO3 nanoparticles were obtained during microwave-assisted hydrothermal reaction and decomposed into spherical Sm2O3 nanoparticles after heat treatment. A potential mechanism of the formation of Sm2O3 nanoparticles is proposed. The UV-vis absorption spectra indicated that the samples had high ultraviolet absorption capacity and the energy gap was only 4.83 eV as the radiation power increased to 550 W.

This is the first systematic report on the preparation and thermoelectric properties of n-type Pb1–x Fe x Te alloys. Iodine-doped n-type Pb0.85Fe0.15Te polycrystalline was prepared by melting and hot-pressing techniques. The morphology and phase structure of the prepared materials were analyzed by scanning electron microscopy and x-ray diffraction, which indicated that the samples possessed a rock-salt crystal structure and showed a biphase structure. The major phase was the polycrystalline PbTe compound and the second phase was the FeTe compound. The FeTe nano-/micro-precipitates were homogeneously distributed in the PbTe matrix, which is beneficial for the reduction of the lattice thermal conductivity. The effects of the iodine content on the thermoelectric properties of I-doped Pb0.85Fe0.15Te have been investigated. The measurement results of electrical resistivity, carrier concentration, Seebeck coefficient, and thermal conductivity in the temperature range of 300–850 K indicate that the thermoelectric transport properties of the obtained samples are sensitive to the iodine content. When the concentration of iodine is about 0.6 at.%, the maximum dimensionless figure-of-merit value of ∼0.65 at 800 K was obtained.

Interfacial heat transfer, as an important factor in rolling process, can significantly affect the roll conditions and the product qualities. However, the heat transfer behavior at the roll-strip interface is highly unclear because of various factors including material properties, contact conditions, surface qualities, etc. It is important to gain an insight into the interfacial heat transfer to clarify the heat transfer characteristics in the work zone along the rolling direction. In this paper, a computational analysis of interfacial heat transfer of strip rolling has been carried out based on the heat transfer theory and the mixed lubrication model, which takes the changes of the real contact area and oil film thickness into account. Also, the effects of oxide scale with and without extruded metal on the interfacial heat transfer are discussed. The results of this research suggest that the interfacial heat transfer coefficient (IHTC) at different positions can be determined based on the local contact conditions, and the theoretical calculation is shown to be an effective way to understand the interfacial heat transfer in the work zone under different rolling conditions.

This study investigated the microstructure and thermal conductivity of as-cast and as-extruded binary Mg–Mn alloys. The large grains and fine α-Mn particles contained in the as-cast alloys were observed. After extrusion, the average grain sizes significantly decreased, typical basal fibre texture was generated and high amount of nano particles precipitated from the α-Mg matrix. The thermal conductivity of both as-cast and as-extruded Mg–Mn alloys gradually decreased with the increase in Mn concentration. As-extruded alloys exhibited lower thermal conductivity than as-cast alloys except for the as-extruded alloys containing higher Mn concentrations (>1.2 wt-% Mn). Compared with binary as-extruded Mg–Al and Mg–Zn alloys reported in literatures, thermal conductivity of the as-extruded Mg–Mn alloys was higher when the solute content was greater than 0.5 at.-%.

The effect of 0–2 wt-% Sn addition on AZ80 magnesium alloys after 350°C extrusion has been studied by analysing microstructure and mechanical properties. The results indicated that dynamically recrystallised grains were fine and homogeneous with less than 1 wt-% Sn addition. In AZ80–0.5Sn alloy, a large number of Mg17Al12 precipitated phases formed in grains and at grain boundaries during extrusion process. With more than 1 wt-% Sn addition, the size of dynamically recrystallised grains increased and the number of Mg17Al12 phases decreased. The strength of as-extruded AZ80–0.5Sn alloy enhanced largely as compared with that of the as-extruded AZ80 alloy. AZ80–0.5Sn alloy had the outstanding tensile and compressive properties.

The microstructural stability in three as-extruded Mg alloys (Mg–0.6Ca, Mg–1.9Sn and Mg–1.9Sn–0.6Ca) at high temperature (673 K) is studied by optical microscope (OM), scanning electron microscopy (SEM), and its effect on the mechanical properties is tested by tensile test. The grain size of Mg–1.9Sn–0.6Ca alloy is retained at high temperature, while grains in Mg–0.6Ca grow at some degree and in Mg–1.9Sn they coarsen seriously. Additionally, the tensile strength of Mg–1.9Sn–0.6Ca is also most thermally stable. The outstanding microstructural and mechanical stability of as-extruded Mg–1.9Sn–0.6Ca alloy is attributed to the strong pinning effect of stable CaMgSn secondary phase. The poor performances of Mg–0.6Ca and Mg–1.9Sn are due to the dissolution of Mg2Ca and Mg2Sn particles, respectively.

In this study, an Mg-air battery based on air cathode with different content of Na2SO4 was prepared to study the effect of Na2SO4 on the performance of Mg-air battery. The electrochemical performance of the air cathode was studied by potentiodynamic polarization and electrochemical impedance spectroscopy. The results indicated that the electrochemical activity of the electrode enhanced with the increasing Na2SO4. The discharge performance of the battery was investigated by constant-current discharge test, and the results showed that the discharge potential of the battery also improved with the increasing of Na2SO4. However, the forming of air cathode became difficult gradually with the increasing content of Na2SO4. What is worse, the oversize pore produced in the moisture barrier when the content of Na2SO4 was too high and the moisture barrier would lose resistance to water. So the content of Na2SO4 should not be too high.

Mg–Al–Sn alloys are being developed as a new series of magnesium alloys due to their good creep resistance, ductility and high temperature properties. The Mg–Al–Sn alloys containing low Al/Sn-content may have potential as a high-ductility wrought magnesium alloy. However, the effect of composition on the microstructure and mechanical properties of wrought Mg–xAl–ySn alloys have received little attention. In the present work, Mg–xAl–ySn–0.3Mn (x = 1, 3, 6 and y = 1, 3) alloys have been prepared by hot extrusion at temperatures from 523 K to 623 K. The experimental results reveal that the yield strength of the as-extruded alloys is sensitive to Al content and extrusion temperature, but insensitive to Sn content. The yield strength increases with decrease Al content or extrusion temperatures. The Mg–1Al–ySn–0.3Mn (y = 1, 3) alloys extruded at the temperatures ≤573 K exhibit the relative higher yield strength in this paper (the yield strength exceed 250 MPa with elongation of about 20%). The relative high strength is mainly attributed to the formation of fine recrystallized grains and high fraction of coarse un-recrystallized grain regions which show strong (10-10) and (0001) textures. The orientation relationship between the precipitated Al8Mn5 phase and the Mg matrix in the Mg–1Al–1Sn–0.3Mn alloy is also determined. And the strengthening mechanism of the alloys is discussed.

Technological advances in glaucoma have challenged the traditional treatment paradigm. Historically incisional surgery has been used in cases of advanced disease and/or uncontrolled intraocular pressures resistant to medical or laser interventions. More recently, perhaps due to advancements in imaging, surgery has been suggested to be beneficial earlier in the treatment paradigm. Despite these trends, surgical manipulation of the tissues and unpredictability of wound healing continue to result in surgical failure. Magnesium is an essential element for human body and plays a critically important role in maintaining the functional and structural integrity of several tissues, including the eye. Due to several of its advantageous properties such as non-toxicity, biodegradability, and high biological compatibility, magnesium alloy has attracted great attention as a novel biomaterial. Biodegradable cardiovascular stents made of magnesium alloy have already been introduced into clinical practice. The purpose of this review is to determine if bioabsorbable magnesium alloys can be utilized as a promising candidate for the development of a new generation of glaucoma surgical assistive devices.

Wrought magnesium alloys commonly exhibit strong texture, which significantly affects the properties of alloys. The effect of texture on the electromagnetic shielding property of these alloys as promising shielding materials is rarely reported. In the present study, the electromagnetic interference shielding effectiveness (SE) of AZ31 sheets with different texture intensities was investigated by coaxial cable method within the testing frequency range of 30–1500 MHz. Results indicated that the SE of the sheets gradually increased with the strengthening of the basal texture intensity. The SE increment was mainly attributed to the improvement in the reflection attenuation of the incident electromagnetic wave, which was induced by the expansion of the impedance mismatch between the air and sheet surface. Furthermore, the relationship among texture, conductivity, and impedance was also discussed.

In the present work, in order to investigate the grain refinement mechanism of AM containing Sn alloys, the as-cast AM60, AM90 alloys, and the alloys with addition of 1 wt.% Sn were fabricated by traditional casting, respectively. During the solidification of AM + Sn alloys, the morphology of divorced eutectic Mg17Al12 was refined by Mg2Sn intermetallic that served as the heterogeneous nucleation cores. The modified Mg17Al12 effectively restricted the grain growth and resulted in a grain refinement. As a result, the yield strength of as-cast AM alloys was significantly enhanced by addition of Sn, while the ductility also improved. Moreover, the edge-to-edge model was employed to predict the orientation relationship between Mg17Al12 and Mg2Sn.

Magnesium alloy sheets were processed by cold rolling without lubrication and with SiO2 nanolubricant so as to investigate cold rolling performance by measuring rolling force as well as the surface roughness of the sheets. A series of ball on disc tests without lubrication and with SiO2 nanolubricant conditions were carried out to simulate the contact and sliding during the cold rolling process. The results indicate that the SiO2 nanolubricant effectively reduced the rolling force and improved the surface quality of sheets by SiO2 nanolubricant during cold rolling process. The excellent cold-rolling performances of AZ31 Mg alloy with SiO2 nanolubricant were attributed to the friction-reducing and the anti-friction mechanism was based on the deposition of nanoparticles on the magnesium alloy surfaces.

AZ31 magnesium alloy and its alloy with 5% lithium were extruded to 1mm in thickness sheets at 380 oC with extrusion ratio of 101. Microstructure evolution and mechanical behavior of the extruded Mg alloy sheets were examined. The microstructure and texture evolution were investigate by electronic backscattered diffraction (EBSD) and X-ray diffraction (XRD). Mechanical performance was carried out by tensile tests at room temperature. In addition, the evolution of neutral layer and microstructure was also examined by V-bending. It was found that Li addition resulted in the strong divergence of the grain orientation. (0002) basal texture of AZ31 alloy sheets with 5% lithium has been weakened. The room temperature ductility of these textural sheets was enhanced owing to the tilted weak basal texture. Moreover, it exhibits superior ductility during V-bending process at room temperature.

Mg batteries have received increasing attention mainly because of their high volumetric capacity (3832 mAhcm−3). In order to form type NO.5 cell packing for Magnesium battery the finite element simulation by Deform 3D was carried out. Then backward extrusion was conducted on an AZ31 magnesium alloy at 300°C. The results show that battery cell packing with the wall of 0.35 mm can be formed through backward extrusion with an AZ31 Mg alloys. A significant grain size refining was resulted from hot BE, however, the microstructure in different positions of the Mg cell packing was inhomogeneous. At bottom of the packing, the microstructure was formed by equiaxial and relatively coarse grains. The wall of the Mg cell packing was made of much finer grains.

In the present work, the microstructure evolution of Mg-4Al-2.5Ca alloy during solidification was investigated by means of scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and differential scanning calorimetry (DSC). The results showed that the as-cast microstructure was typical dendritic structure, consisting of α-Mg and the Al2Ca with a C15 structure formed at inter-dendritic regions. But during slow solidification, the sequence of phase formation of this alloy consisted of following stages: L→ L + α-Mg → L + α-Mg + (Mg, Al)2Ca → α-Mg + (Mg, Al)2Ca + Al2Ca → α-Mg + Al2Ca. Thermal analysis showed that the (Mg, Al)2Ca and Al2Ca phase separation temperature was about 520°C and 510°C respectively, which is different from thermodynamic calculation. With the temperature decreasing, the liquid (Mg, Al)2Ca phase with thick and continuous morphology transformed into lamellar-shaped eutectic phase, and parts of (Mg, Al)2Ca phase translated into Al2Ca phase with bone-shaped and needle-like.

The rare earth element Ce was added in Mg-2.0Zn-1.0Mn magnesium alloys. And the homogenizing treatment and the extrusion deformation tests for the alloy were carried out. The effects of the Ce addition and homogenization on the microstructure and mechanical properties of Mg-2.0Zn-1.0Mn magnesium alloys were studied in the present investigation. The results showed that the addition of Ce can effectively refine the grain size of ZM21 alloy, improve the mechanical properties of magnesium alloy ZM21 and reduce the latent heat and solidification temperature range of the alloy. Homogenizing annealing treatment slightly affected the microstructure and mechanical properties of ZM21 alloy extrusion products but significantly affected the ZM21+Ce magnesium alloy. The fracture analysis indicated that the fracture of the two alloys was mixed fracture, while the fracture of magnesium alloy ZM21+Ce showed more ductile fracture feature.

After 5% lithium was added to AZ31 magnesium alloy, the alloy was extruded at 380oC with the extrusion ratio of 101. Mechanical responses and microstructure evolution were investigated. The microstructure and texture evolution were examined by electronic backscattered diffraction (EBSD) and X-ray diffraction (XRD). Tensile tests in the tensile directions of 0o, 45oand 90owere carried out at room temperature. Lithium addition brought about the strong divergence of the grain orientation and triggered the spread of the (0002) basal texture. The room temperature ductility of the extruded Mg alloy sheets was improved due to the tilted weak basal texture.

For the study of the weldability of new-typed Mg-1Al-xSn-0.3Mn (x=1,3) magnesium alloys, the plates of extruded Mg-1Al-xSn-0.3Mn (x=1,3) magnesium alloys with a thickness of 2.8 mm were friction stir welded by butt. And the microstructure and properties were tested and analyzed by X-ray non-destructive test, OM, SEM, EDS, microhardness and tensile test. The results show that the above-mentioned magnesium alloys could be successfully butt-welded without any defect by friction stir welding, the microstructure in the NZ was fine and equiaxed, and some grains in the TMAZ were elongated in the form of bars. Moreover, the tensile strength of the friction stir weld could reached over 85% that of the base material and the HAZ at advancing side of the weld had the lowest hardness.

In the present work, the influence of Al-Sr and Mg-Sr master alloys on the as-cast microstructure of the AZ31 magnesium alloy was investigated,and the refinement efficiencies of both master alloys were also analyzed and compared. The research results indicate that both the Al-Sr and Mg-Sr master alloys have obvious refinement effect on the as-cast microstructure of the AZ31 magnesium alloy, and the refinement efficiency of the Mg-Sr master alloys was better than that of the Al-Sr master alloys. The mechanisms for the differences of grain refinement efficiency between Al-Sr and Mg-Sr master alloys on the AZ31 magnesium alloys were also discussed.

The solid–liquid diffusion between Mg and Mg-10 at.% Ca alloy was studied at a temperature range of 570°C to 630°C for 10, 20, 30min, respectively. Only one compound, Mg2Ca, was observed in the diffusion couples. As the diffusion time increased, the dendritic structure of the diffusion layer became coarser. The thickness of the diffusion layer had an exponential relation to the experimental temperature. The Mg2Ca phase was observed to follow parabolic growth with diffusion time, which suggested that the growth of the Mg2Ca phase was controlled by diffusion mechanism. The activation energy was determined to be 111.28 kJ/mol.

Anisotropic mechanical behavior is one of the key factors restricting the processing procedure of magnesium alloys. This pronounced anisotropy, however, cannot be characterized by classical isotropic or kinematic hardening due to the constant shape of yield surfaces during plastic deformation. Therefore, the shape evolution of yield surfaces, also known as distortional hardening is the main way to capture the anisotropic behavior. Based on elasto-plasticity theory at finite strain, constitutive model with distortional hardening for Mg alloys is proposed. The thermodynamical consistency is proved. The anisotropic mechanical behavior of AZ31 sheet is demonstrated after material parameters calibration.

Mg alloy is a potential material to be used in automobile, especially in the stamping products. Through texture weakening, temperature increasing, strain rate decreasing, blank holder force controlling, lubrication choosing and so on, the formability of AZ31 magnesium alloy is improved so that the cold stamping on some simple products can be conducted. However, on the complicated products, hot stamping should be considered. Temperature has an important effect on the formability of Mg alloy sheet. As the temperature increasing, the strength of Mg alloys sheet decreases while the formability increases. Hot stamping process is an effective way to broaden the using of Mg alloys.

In this paper, Mg-6.0Zn-0.6Zr-1.0Y magnesium alloy for different levels of Zn extrusion test, and after extrusion products for the microstructure and mechanical properties of microscopic analysis, research Zn on Mg-6.0Zn-0.6Zr-1.0Y magnesium alloy extrusion and mechanism of influence of microstructure and mechanical properties, optimize the industrial extrusion products best optimum amount of Zn in Mg-6.0Zn-0.6Zr-1.0Y magnesium alloy.

This article was added to the ZM21 alloy Mg-Ce master alloy containing rare earth Ce get ZM21 slab, and then on the ZM21 and ZM21 + Ce a magnesium alloy extrusion and secondary research Ce on ZM21 alloy secondary squeeze pressure on the deformation microstructure and properties.

The effect of 0–4 wt-% Sn addition on the microstructure and tensile properties of AZ80 alloys was investigated. The results indicated that Mg2Sn particles were barely formed during the extrusion process until the content of Sn is >2 wt-%. The dislocation density in alloys after extrusion declined with the addition of Sn due to the promotion of dynamic recrystallisation after adding Sn. In aging treatment, Mg17Al12 precipitates were promoted by Sn and the phases distributed uniformly at low density level of dislocation. The AZ80-2 wt-% Sn alloy possessed the excellent tensile properties in as extruded and as aged state.

The mechanical behaviour of AZ31 magnesium alloy sheets were evaluated at different directions tilting 0, 45 and 90° to rolling direction. A suitable critical point of pre-stretching has been investigated through the work hardening curve of the magnesium alloy sheets. The microstructure and mechanical properties were examined and compared. The results indicated that the average yield strength of the 0, 45 and 90° pre-hardened 4% specimens followed by annealing decreased 30 MPa and the average uniform elongation increased up to 38% compared with the as received sheet. Pre-hardening process is suggested as a potential technique to improve the ductility and anisotropy of magnesium alloy sheets.

The effect of aging treatment on fracture toughness in Mg–6Zn–1Mn (wt-%) was investigated by optical microscopy, scanning electron microscopy, transmission electron microscopy, scanning transmission electron microscopy, uniaxial tensile and fracture toughness tests, respectively. The results showed that the fracture toughness of Mg–6Zn–1Mn alloy can be enhanced by aging treatment. The fracture toughness and strength showed a reverse trend in single aged and double aged alloy. Synergetic effect of fine grains and precipitates improved the fracture toughness more sharply than aging treatment. The precipitate free zones and grain boundary precipitates made the largest contribution to the reduction of toughness. Under as extruded and aged conditions, the main origins of cracks were elastic incompatibility and plastic deformation.

The ZK60 magnesium alloys add Y were deformed with extrusion simulation system, and extruded products for various heat treatment processes. The mechanism properties of Y element in ZK60 and its effect on microstructure were analyzed. as well as heat treatment process for ZK60 and ZK60 +1.0Y two influence of alloy microstructure and properties were investigated. The results showed that the addition of rare earth Y can effectively refine the grain ZK60 alloy, and can significantly improve the performance of ZK60 alloy plasticity. Artificial aging treatment can improve ZK60 and ZK60 +1.0Y alloy yield strength and ductility, the best artificial aging treatment ZK60 and ZK60 +1.0Y alloy extrusion products for the 180°C×24h.

This work examined the effects of Sc addition of 0·7–1·3 wt.% on the microstructure and tensile properties of ZK60 alloy. The investigation showed that the Sc3Zn17 intermetallic compound was present in the as cast ZK60 alloy with the addition of Sc. After the hot extrusion, the degree of recrystallisation was decreased with the increasing of Sc content and the recrystallised grains were effectively refined due to the presence of Sc solute and particles in the grain boundaries which led to the significant improvement of the ultimate and yield strength of ZK60 alloy with Sc addition at room temperature. Furthermore, the addition of Sc to ZK60 alloy sharpened the extrusion texture.

In this paper, the Back-Propagation neural network (BP network) and the establishment of the AZ61 magnesium alloy high temperature constitutive model and test data obtained for training the neural network, after training the neural network to become a knowledge-based constitutive model formed AZ61 magnesium alloy flow stress and dynamic recrystallization of the neural network model tested by the neural network model with traditional regression methods predict contrast, results showed that the higher the accuracy of the neural network model for dealing with a large number of test data to establish the constitutive relations of materials with high stress and promotion of value.

Magnesium alloys are widely used in various fields. However, their electromagnetic interference (EMI) shielding effectiveness (SE) was rarely reported. In this work, the electrical properties and EMI SE of Mg–xZn (x = 0–5 wt-%) alloys in as-cast, T4 and T6 states were investigated. The SE value was measured in the frequency range 30–1500 MHz by the coaxial cable method at ambient temperature. With increasing content of Zn, the SE value shows variations in as-cast, T4 and T6 states. In the T6 state, Mg–4Zn alloy possesses the highest SE value of 116–95 dB in the whole test frequency range. The EMI shielding of Mg–Zn alloys has been attributed to the contributions from reflection (SER) and absorption (SEA), Zn solubility and also the quantity and distribution of second phases in the Mg–Zn matrix.

The deformation behavior of as-cast AZ61 alloy in the temperature range 300-450°C and in the strain rate range 0.01~5 s−1 has been studied using processing maps. For obtaining the processing map, the variation of the efficiency of power dissipation given by [2m/(m+1)] where ‘m’ is the strain rate sensitivity, is plotted as a function of temperature and strain rate. The map exhibited a domain of dynamic recrystallization (DRX) occurring at 425 °C and 0.1 s−1 which are the optimum parameters for hot working of the alloy.