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The use of new technologies in language teaching has a positive effect both on the teaching process itself and on the motivation of students. Today’s students are not satisfied with the teaching material they use in class, they need additional support and motivation, additional engagement within their field of interest, which is the digital world. If we offer them appropriate platforms, applications and opportunities for their improvement outside of institutional learning (which is the basis for any further advancement), it is possible to achieve exceptional results. The aim of the paper is to examine students’ attitudes about the use of additional materials in Romanian as a foreign language teaching both in Serbia and Romania, at the University of Novi Sad and the “Alexandru Ioan Cuza” University of Iași. In the course of the winter semester of the academic year 2021/2022, students used the Campster platform and the courses on it, which were free to use. Two groups of students, one from each country, participated in the survey of students’ attitudes.

The mechanical properties and microstructure of copper base shape memory alloys are relatively well known, while data on thermal properties (thermal conductivity, specific heat, and temperature conductivity) are not available. In the frame of our investigation work thermal properties of rapidly solidified Cu-Al-Ni-Mn alloy were determined. As the first part of the work, a study and evaluation of the operation of the device for determining the thermal properties of Hot Disk TPS 2200, today one of the more modern and high-quality instruments for determining thermal properties has been carried out. In the second part of the work, the measurements and analysis of thermal properties of rapidly solidified Cu-Al-Ni-Mn shape memory alloy in accordance with the standard ISO 22007-2 at ambient and elevated temperatures have been done.

Čelik je najvažniji metalni materijal. Po količini proizvodnje i potrošnje čelik je odmah iza betona i drveta. Primarna sirovina za proizvodnju čelika je bijelo sirovo željezo, dok je čelični otpad (staro željezo) sekundarna sirovina. U ovom radu prikazan je pregled svjetske potrošnje čeličnog otapada kao sekundarne sirovine za proizvodnju sirovog čelika. Objašnjene su vrste, kvaliteta i priprema čeličnog otpada. Prema dostupnim podacima izračunat je i stupanj recikliranja čelika u svijetu za 2019. godinu (34, 6%). Utvrđeno je da je stupanj recikliranja čelika u industrijski visokorazvijenim državama ili regijama znatno viši od svjetskog prosjeka. U 2019. godini u SAD je reciklirano 69, 1%, a u EU 55, 7% čelika.

Čelik je najvažniji metalni materijal kojeg prati gotovo stalni porast proizvodnje u 20. i 21. stoljeću. Primarna sirovina za proizvodnju čelika je sirovo željezo koje se dobiva na temelju redukcije pripremljene rude željeza u visokoj peći. Sekundarne sirovine za proizvodnju čelika su staro željezo (čelični otpad), proizvodi direktne redukcije i redukcijskog taljenja („vrući metal“) rude željeza. Gotovo svake godine raste eksploatacija i potrošnja rude željeza za izradu sirovog željeza, proizvoda direktne redukcije i redukcijskog taljenja. Navedeno je doprinijelo da je ukupna svjetska proizvodnja čelika u 2020. godini, u odnosu na 2000. godinu povećana za 2, 2 puta. To potvrđuju i podaci da je u 2020. godini proizvedeno 1877, 5 Mt čelika. U razdoblju od 2000. do 2020. godine ukupna svjetska proizvodnja čelika iznosila je 28, 5 Gt. U ovom je radu prikazan pregled potrošnje osnovnih sirovina, nositelja željeza kao osnovnog metala potrebnog za proizvodnju sirovog čelika (rude željeza, sirovo željezo, staro željezo, direktno reducirano željezo, itd.) u svijetu u prva dva desetljeća 21. stoljeća.

The electrochemical behavior of CuAlMn alloy in 0.5 mol dm-3 NaCl solution and in the presence of 0.1, 0.3 and 0.5 mol dm-3 Na2SO4 at T = 20 oC and pH = 7 was investigated. Conventional electrochemical techniques were used including open circuit potential, linear and potentiodynamic polarization measurements. The electrochemical measurements showed that the presence of sulfate ions in the chloride solution leads to a decrease in corrosion current density values and to an increase in polarization resistance values for the SO42- ion concentrations of 0.1 and 0.3 mol dm-3. At the highest concentration of sulfate, corrosion current density increases again, and the value of the polarization resistance decreases, probably due to the dissolution of the surface layer of corrosion products. The effect of electrolyte exposure time on 0.5 mol dm-3 NaCl and 0.5 mol dm-3 NaCl + 0.5 mol dm-3 Na2SO4 was examined by measuring with linear polarization method over a period of 24 hours, with the polarization resistance values increasing with time in both NaCl and NaCl + Na2SO4 solution, and these values being significantly higher in the solution with sulphate ions. After electrochemical measurements, the corroded electrode surfaces were examined with an optical and scanning electron microscope.

Na zahtjev ljevaonice Proizvodnja OSO provedena je metalografska analiza uzorka RG5 bronce u svrhu određivanja utjecaja optimizacije proizvodnog procesa na razvoj mikrostrukture.

Na zahtjev tvrtke Proizvodnja OSO, Velika Gorica provedena je metalografska priprema i analiza uzorka RG 5 bronce u različitim fazama taljenja i obrade taline. Ispitivanje je provedeno u svrhu otkrivanja uzroka gubitka bakra i legirajućih elemenata tijekom obrade taline.

Znanje postaje sve važniji resurs gospodarskog razvoja. Republika Hrvatska suočena je s izazovima svjetskog gospodarstva prema kojima, između ostalog, mora ispuniti određene zahtjeve u oblikovanju obrazovnog sustava. Osiguranje jamstva kvalitete obrazovnog sustava samo je jedan od zahtjeva koje Metalurški fakultet ima postavljen kao kontinuiranu misiju. Kako stupanj obrazovanja stanovništva utječe na napredak gospodarstva, za Republiku Hrvatsku iznimno je važno povećati udio visokoobrazovanih upravo u strateškom polju Metalurgije u području Tehničkih znanosti. S potrebom za profilom stručnjaka iz polja metalurgije suočavamo se na tjednoj bazi. Stoga je nužno promijeniti poimanje filozofije struke metalurgija. Današnja moderna metalurgija je specifično polje koje se bavi dizajnom, razvojem i karakterizacijom metalnih materijala od onih svakodnevnih koji nas okružuju u našim domovima, na radnim mjestima do materijala s naprednim svojstvima i za specifične primjene poput onih za automobilsku ili svemirsku industriju, medicinu, ali i atraktivnu IT industriju. Metal čini osnovu svake sigurnosno-kritične komponente koja nas okružuje i čini našu svakodnevicu funkcionalnom, sigurnom i udobnom. Sve dosadašnje industrijske i tehnološke revolucije, kao i današnja Industrija 4.0 potpuno su nezamislive i neprovedive bez metalne platforme. Proizvodne djelatnosti i obrazovanje čine temelj razvoja svake države te je i strategiju razvoja nužno osloniti upravo na izvrsne mlade ljude koji stjecanjem znanja te istraživačkim pristupom obogaćuju Republiku Hrvatsku rijetkim znanjima, vještinama i kompetencijama. Sve se to ogleda u strateškim pravcima Metalurško inženjerstvo, Metalni materijali te Sigurnost, zdravlje na radu i radni okoliš. Izvrsnost se temelji na ulaganju u visokosofisticiranu opremu kao potencijal postizanja novih i/ili inovativnih znanja, kreativnosti te prepoznatljivosti na europskoj istraživačkoj karti. Potencijal ulaganja zasniva se na infrastrukturnim projektima Centar za ljevarstvo – SIMET (KK.01.1.1.02.0020) u partnerstvu sa Sisačko-moslavačkom županijom, vrijednosti od 40.401.494, 36 HRK te VIRTULAB – Integrirani laboratorij za primarne i sekundarne sirovine (KK.01.1.1.02.0022) u partnerstvu s Rudarsko-geološko-naftnim fakultetom, Prehrambeno-biotehnološkim fakultetom, Geotehničkim fakultetom i Fakultetom kemijskog inženjerstva i tehnologije Sveučilišta u Zagrebu, vrijednosti za Metalurški fakultet 3.038.562, 92 HRK. Oba projekta financirana su iz Europskog fonda za regionalni razvoj, Operativnog programa Konkurentnost i kohezija (2014-2020.). Ulaganje u opremu nije samo sebi cilj. Uspostavljeni znanstvenoistraživački potencijal čini temelj za ulaganje u znanje, vještine i kompetencije djelatnika i studenata, ali i otvara mogućnost ciljanih djelatnosti kroz spin off poduzeće budući da je u društvenom poretku koji danas živimo nužno doseći samodostatnost. Ciljane aktivnosti otvorile bi vrata cjeloživotnom obrazovanju zainteresiranih vanjskih dionika koji bi kroz znanstvenoistraživačke i stručne projekte te fokusiranom edukacijom o mogućnostima istraživanja te osposobljavanjem za kritičko i inovativno promišljanje prateći moto od ideje do gotovog proizvoda, bili sposobni osnovati start up poduzeće temeljeno na realizaciji jedinstvenih i specifičnih ideja u polju Metalurgija. Konkurentnost je moguće temeljiti isključivo na suvremenoj tehnologiji, učinkovitim proizvodnim postupcima, ali isto tako i na visokokvalificiranoj radnoj snazi. Razvoj aktualnih studijskih programa obuhvatio je sve tri razine obrazovanja pa tako Metalurški fakultet pronalazi niše u skladu sa znanjem, vještinama i kompetencijama oslonjenim na polje Metalurgija, njegujući pritom inter- i multidisciplinarnu suradnju unutar i izvan institucije. Sve to zahtijeva ulaganje u infrastrukturu i obrazovne studijske programe koje Metalurški fakultet usmjerava ka stjecanju prije svega praktičnih znanja i vještina s naglaskom na razvoj i primjenu suvremenih materijala i tehnologija. Aktivnosti istraživanja i razvoja te prijenosa znanja koje aktivno provodimo, uz inovativnost, kreativnost i fleksibilnost, neophodne su da bi gospodarstvo postalo konkurentnije. Industrijska strategija Republike Hrvatske utvrđuje strateškim ciljevima djelatnosti iz područja proizvodnje i prerade metala koje spadaju u skupinu tzv. „pokretača“, velikih izvozno orijentiranih poddjelatnosti koje ostvaruju dobit i zapošljavaju značajan broj djelatnika. Ukupno metaloprerađivačka industrija temeljem ishoda ključnih poddjelatnosti u pandemijskoj 2020. godini čini 15, 5% industrijske proizvodnje RH. Budući da je metaloprerađivačka industrija izrazito izvozno orijentirana, navedeno ukazuje da je i opseg proizvodnje orijentiran potrebama inozemnih proizvođača gotovih proizvoda. Tome u prilog ide i visoki udio djelatnosti metalske industrije u ukupnom robnom izvozu RH čiji je udio u 2020. iznosio gotovo 24%. Razvoj društva moguće je temeljiti isključivo na čvrstoj neraskidivoj poveznici visokoobrazovnog sustava i proizvodnih djelatnosti. Dosadašnje modele suradnje Metalurškog fakulteta s gospodarskim dionicima nužno je unaprijediti osnivanjem Gospodarskog savjeta Metalurškog fakulteta kao savjetodavnog tijela za poticanje umrežavanja kroz razvoj studijskih programa te znanstvenoistraživačkih i stručnih projekata. Potporu razvoju svakako je nužno osigurati osnivanjem Ureda za međunarodnu suradnju, suradnju s gospodarstvom, projektne prijave i projekte. Sve je to na tragu novog poimanja struke i polja Metalurgija te potencijalne modernizacije naziva Metalurškog fakulteta Sveučilišta u Zagrebu budući da smo posljednji fakultet u EU koji se nije nametnuo takvim pristupom. Novi naziv svakako treba obuhvatiti specifična područja istraživanja poput Metalurškog inženjerstva i metalnih materijala, industrijske ekologije i radnog okoliša, ali i sigurnosti te zdravlja na radu povezanih s proizvodnim procesima. Suvremeni metalni materijali i inženjerstvo & ekologija i primjena sekundarnih sirovina & sigurnost čine okosnicu razvoja bazne industrije, prepoznavanje i priznavanje važnosti struke na lokalnoj, ali i globalnoj razini, ali i poboljšanja društva u cjelini.

Materijali s prisjetljivosti oblika su „pametni“ materijali koji se vraćaju prethodno definirano stanje ili oblik, pri određenom postupku toplinske i/ili mehaničke obrade. Postoje razne vrste materijala s prisjetljivosti oblika poput legura, polimera, keramika i gelova s prisjetljivosti oblika. Zbog iznimnih svojstava pronalaze primjenu u mnogim industrijskim granama poput strojarske industrije, elektroindustrije, ali i medicine, mode, umjetnosti i dekoracije itd. U ovom radu bit će dan pregled upotrebe pametnih materijala u svakodnevnom životu.

U ovom radu prikazani su rezultati zavarivanja cijevi iz niskougljičnog čelika St 35.8 (Č.1214, DIN17175, W. Nr. 1.0305, EN-P235GH) TIG postupkom. Nakon zavarivanja provedena je analiza mikrostrukture pomoću optičkog mikroskopa. Mikrostrukturna analiza je provedena na osnovnom materijalu, zoni utjecaja topline i zoni taljenja. Utvrđeno je da osnovni materijal ima feritno-perlitnu mikrostrukturu s tvrdoćom 148, 3 HV10, dok je u zoni utjecaja topline prisutna također feritno-perlitna mikrostruktura s mjestimično prisutnim Widmanstattenovim feritom i tvrdoćom 176, 0 HV10. U zoni taljenja zamijećena je lijevana mikrostruktura koja se sastoji od ferita i bainita s tvrdoćom (228, 7 HV10).

The objective of this study was to investigate the influence of chloride ion concentration (from 0.1 to 1.5%) and temperature (from 20 to 40 °C) on corrosion behavior of CuAlMnZn alloy in NaCl solution stirred with a magnetic stirrer (150 rpm). Electrochemical techniques such as open circuit potential measurement, linear, potentiodynamic polarization and cyclic voltammetry methods have been applied. The results have been shown that increase in concentration and temperature of NaCl solution leads to a lowering open circuit potential values of alloy, increase in corrosion current density and a decrease in values of the polarization resistance. After polarization measurements, corroded electrode surfaces, were examined with an optical microscope.

CuAlNi alloy has been evaluated for its corrosion behaviour in the 0.5 mol dm-3 H2SO4 stirred solution at the rotation rate of magnetic stirrer of 150 and 450 rpm, at 20 and 40 oC. Investigations were performed using open circuit potential measurements, linear and polarization measurements. After polarization measurements corroded surfaces were evaluated using light microscopy analysis. It was found that increasing in electrolyte temperature leads to higher corrosion damages of alloy while increase in rotation rate of stirrer has smaller impact on corrosion. The presence of intergranular corrosion on the electrode surfaces was clearly seen with optical microscope.

In this work microstructure analysis and microhardness testing was carried out on duplex stainless steel X2CrNiMoN22-5-3 after welding and annealing. Investigated stainless steel was welded using two welding procedures. The root of weld join was performed with TIG process and for filling SMAW process was used. Analysis of microstructure and microhardness was carried out before and after annealing. Annealing of welded joint was performed at temperature of 850 °C in duration for 60 minutes followed by cooling in air. After annealing, the samples were metallographic prepared. Optical microscopy and scanning electron microscopy with energy dispersive spectrometer were used for characterization of microstructure. Results shows that before annealing microstructure was consisted of ferrite and austenite, and after annealing presence of sigma phase was determined in weld metal. Microhardness values of samples before and after annealing was determined by Vickers method. A significant increase in microhardness values was observed in weld metal after annealing (from 294.9 HV1 to 357.0 HV1).

In this paper, the influence of temperature on corrosion behaviour of CuAlMnZn alloy in 0.5 M Na 2 SO 4 solution (pH = 7) was investigated. Investigations have been performed using electrochemical methods, such as open circuit potential, linear and potentiodynamic polarization, cyclic voltammetry and electrochemical impedance spectroscopy. After corrosion measurement, alloy surfaces were examined with a light microscope. The results have shown that investigated alloy has good corrosion resistance towards sulphate anions in neutral solution, which is manifested with relatively low corrosion densities and relatively high values of polarization resistance. By increasing the temperature of the electrolyte, corrosion susceptibility becomes higher. Also, prolonged time of immersion in electrolyte have a negative impact on alloy corrosion stability.

In this work preliminary results of the heat treatment effect on microstructure and microhardness of Cu-8.5Al-10Mn-(0.25-1.00)Zr alloys were presented. Ingots (8 mm in diameter and 15 mm in length) were produced by melting and casting process. Production of investigated alloys was performed in laboratory electric arc furnace. Melting was carried out using the heat produced by electric arc and by a water-cooled, specially constructed copper anode that also served as a casting mould. The samples were analysed in as-cast state and after heat treatment at 900 °C/15 min/water. Microstructural analysis was performed by optical microscopy (OM), scanning electron microscopy (SEM) equipped by device for energy dispersive spectroscopy (EDS). Preliminary optical microscopy analysis of investigated alloys confirmed that microstructure was consisted of martensite only in Cu-8.5Al-10Mn- 0.25Zr alloy in as-cast and heat treated state. SEM analysis show the start of martensite formation in some places at all investigated alloys in both, as-cast and heat treated state. A microhardness measurement was performed by Vickers method. Microhardness values of Cu- 8.5Al-10Mn-(0.25-1.00)Zr alloys were up to 215.8 HV1 after casting and up to 224.5 HV1 after heat treatment.

In this work the results of microstructural analysis and impact energy testing of austenitic stainless steel AISI 316L were carried out. Investigations were performed before and after annealing at 850 °C. Annealing time in this investigation varied from 30 to 90 minutes. After annealing, the samples were cooled in room temperature air. Microstructural analysis of initial rolled and different annealed states was performed by optical microscopy (OM) and scanning electron microscopy (SEM) equipped with device for energy dispersive spectroscopy (EDS). Impact tests were performed on Charpy V-notch specimens at room temperature. Initial rolled state of investigated steel showed the presence of typical elongated polygonal grains austenite and delta ferrite while annealed states showed the presence and evolution of sigma phase in microstructure. Impact energy value of initial rolled state was 260 J and by increasing annealing time it decreases.

Cavitation erosion testing of Cu-12.8 Al-4.1 Ni (wt.%) shape memory alloy samples was investigated. Samples for analysis were produced by continuous casting procedure obtaining CuAlNi bar of 8 mm in diameter. Microstructural and cavitation erosion testing were carried out on samples in as-cast and after solution annealing at 885 C for 60 minutes following room temperature water quenching. Metallographic analysis using optical microscope (OM) and scanning electron microscope (SEM) was performed. Examination of microstructure reveals martensite in both investigated samples. Cavitation erosion resistance testing was applied using standard ultrasonic vibratory cavitation set up with stationary specimen. Weight loss and image analysis were used for determination of the effects of cavitation erosion. Based on obtained results, very low values of mass loss were measured for both samples, after an exposure time of 420 minutes. Further image analysis of the samples and pits characteristics at the end of the experiment pointed out very low cavitation erosion.

Tehnologija oko nas sve više i više napreduje, a tehnološki razvoj i tehnološka postignuća iznimno su značajna za ugodniji i lakši život. Prije samo dvadesetak godina mobilni telefoni nisu izgledali kako izgledaju danas...poprilično pametno, rekli bismo. Pametni telefoni nam omogućuju da budemo dostupni cijelo vrijeme svima te da uvijek budemo on-line i u toku sa svim događanjima. No što se to pametno krije u pametnim telefonima i kakve to veze ima s metalima...saznat ćete u ovom zanimljivom znanstveno-popularnom predavanju.

Niomol 490 K steel belongs to the group of High Strength Low Alloy Steel (HSLA). The aim of this study was to determine the transition temperature of the Charpy impact toughness of welded Niomol 490 K steel. The samples for testing of the Charpy impact toughness were heat treated in order to obtain different microstructures. Metallographic samples were prepared according to the classical procedure. For microstructure analysis an optical microscope and scanning electron microscope were used. Heating that appears at the deposition of the next welding layer was simulated by short heating into the two-phase region (austenite and ferrite). It is found that impact toughness is highly dependent on steels microstructure. The transition temperature of the Niomol 490 K steel in the initial state was about -67 ° C. After water quenching from 920 °C, the Charpy impact toughness of the upper level was reduced to about a half of the value than that of the steel in the initial state. After reheating to 750 °C, the toughness was reduced by approximately half of the value that in water quenched sample. The fracture surface in the region of a completely ductile fracture shows the areas of shear decohesion. The transition from the brittle to the ductile fracture shows that the crack propagation path expands with the plane slip to the first tiny dimples.

The corrosion behavior of different CuAlMn shape memory alloys (Cu-12%Al-4%Mn, Cu-12.3%Al-5.2%-Mn and Cu-12%Al-6%Mn) in 0.9% NaCl solution at pH = 7.4 and T = 37°C was investigated using open circuit potential measurements, polarization and electrochemical impedance spectroscopy methods. It has been found that the corrosion resistance of the tested samples at open circuit potential increases with increasing Mn content in the alloy, i.e. growing in the order of: Cu-12%Al-4% Mn < Cu- 12.3%Al-5.2%Mn < Cu-12%Al-6% Mn. Namely, the corrosion current decreases in same order, while the polarization resistance and the resistance, thickness and compactness of the surface oxide layer increase. However, at high anodic potentials (E > 0.1 V), the corrosion rate increases with Mn content in the alloy, and light microscopy investigations reveal pits on the surface of Cu- 12.3%Al-5.2%-Mn and Cu-12%Al- 6%Mn alloys, while Cu-12%Al-4%Mn surface is almost clear of any corrosion damage.

Legure s prisjetljivosti oblika (engl. Shape Memory Alloy-SMA) su „pametni“ i inovativni inženjerski metalni materijali koji pokazuju sposobnost vraćanja u prethodno definirano stanje ili oblik pri određenom postupku toplinske obrade. Najpoznatije legure s prisjetljivosti oblika su legure na bazi nikla i titana te na bazi bakra. Njihov inženjerski razvoj uvelike utječe na razvoj korisnih i inovativnih legura u gotovo svim područjima primjene. Legure s prijetljivosti oblika na bazi bakra imaju sve veći značaj, a osnovna im je prednost njihova niska cijena u odnosu na skupe NiTi legure. Cu-Al-Mn legura s prisjetljivosti oblika je pokazala značajno bolju duktilnost, dobar oporavak oblika te visoku sposobnost prigušenja vibracija naspram drugih poznatih legura na bazi bakra, poput Cu-Al-Zn i Cu-Al-Ni. Mangan kao legirajući element proširuje i stabilizira β-fazno područje, te poboljšava plastičnost legure. Zbog zadovoljavajuće plastičnosti navedene legure, cilj je razviti postupak dobivanja žice Cu-Al-Mn legure s prisjetljivosti oblika za potencijalnu komercijalnu primjenu. Legura je lijevana postupkom vertikalnog kontinuiranog lijevanja u obliku šipke promjera 8 mm, nakon čega je podvrgnuta postupku kombinacije tople i hladne plastične deformacije. Topla plastična deformacija sastojala se od valjanja i kovanja u profiliranom alatu nakon čega je dobivena šipka 4, 80 mm. Tijekom procesa hladnog vučenja iz šipke promjera 4, 80 mm dobivene su žice promjera 4, 47 mm, 3, 22 mm i 1, 80 mm. Uspješnim razvojem postupka deformacije dobivena je deformabilna Cu-Al-Mn žica promjera 1, 80 mm koja zbog iznimnih svojstava može pronaći svoju komercijanu upotrebu u različitim područjima.

This paper presents a review of electrochemical and corrosion investigations on behaviour of CuAlNi and CuAlMn alloys in NaCl solutions, which were carried out within the framework of the project IP-2014-09-3405“ Design of microstructure and functional properties of copper-based shape memory alloys”, supported by the Croatian Science Foundation. The influence of alloys heat treatment on their corrosion behaviour was investigated, as well as the influence of chloride concentration, pH values and electrolyte temperatures. Cu-shape memory alloys were produced by continuous vertical casting and melt spinning method. Investigations were conducted by electrochemical methods such as open circuit current measurement method, electrochemical impedance spectroscopy method, linear and potentiodynamic polarization. Corroded specimens characterization was obtained by optical and scanning electron microscope. Analysis of the corrosion product composition was carried out by EDS method.

The Cu-11.9Al-2.5Mn (wt. %) shape memory alloy was produced by vertically continuous casting technique obtaining bars of 8 mm in diameter which is applicable for plastic deformation. With the process of hot rolling and forging the 4.80 mm bar was produced. Afterwards, the obtained 4.80 mm bar was subjected to cold drawing process. After first run and after fourth run of cold drawing process the wire with diameter of 4.47 mm and 3.22 mm was produced, respectively. Optical microscopy (OM) and scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS) shown the insight in the samples microstructure. The as- cast state sample has two phase (α+β) microstructure. After cold working process the two-phase (martensite+α) microstructure appears. As the result of the cold working process it can be noticed a texture inside the sample depending on cold drawing direction. The microhardness of samples increases as the wires diameter decreases.

Shape memory alloys (SMAs) are a relatively new advanced functional metallic materials used in different industrial fields. Among them CuAlMn alloys can be used due to their ductility. In this work the results of microstructural and dynamic- mechanical properties of Cu-8.3Al-9.4Mn (wt. %) alloy after casting and plastic deformation are presented. After cold rolling of strip the solution annealing at 900 °C holdnig for 30 minutes following water quenching was carried out. Metallographic analysis of the alloy was carried out by an optical microscopy (OM) and scanning electron microscopy (SEM) equipped by device for energy dispersive spectroscopy (EDS). Damping properties of the alloy were carried out by dynamic-mechanical analyzer (DMA) method. It was found that after casting and hot+cold rolling two- phase (alpha+beta) microstructure existed, while after quenching of the strip only martensite microstructure occurred. Dynamic-mechanical analysis results confirmed large energy loss in the investigated samples, as a result of movement of interfaces of martesite structure.