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Effects of applied pressure and residual heat quenching on the mechanical and thermal properties of cast Al–Mg–Zn–Mn–Fe alloys.
- Source :
-
Materials Science & Engineering: A . Feb2024, Vol. 892, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
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Abstract
- In this study, the effects of applied pressure (AP) and residual heat quenching (RQ) on the mechanical properties and thermal conductivities of Al-4.6Mg-3.6Zn-0.86Mn-0.48Fe alloys were investigated based on intensively microstructure analysis by scanning electron microscope (SEM), high resolution transmission electron microscopy (HRTEM) and synchrotron X-ray tomography (SXT). The results indicated that AP and RQ did not change the type of intermetallic; instead, they reduced the length and quantity of lath-like Al 6 (Fe,Mn) and significantly refined the grain by increasing the cooling rate. Moreover, η′ precipitation particles were enriched near the grain boundaries, which was beneficial for the yield strength of the alloy; the AP + RQ sample exhibited the best mechanical properties of the ultimate tensile strength, yield strength and elongation of 269 MPa, 164 MPa and 11.4 %, respectively, which were 19 %, 17 %, and 83.8 % higher than those of the gravity cast (GC) sample. Moreover, the thermal conductivity of the AP + RQ sample did not show significant changes, which were attributed to the reduction in solid solute caused by the increased volume fraction of η′ precipitates, thus improving the thermal conductivity; however, the formation of numerous semi-coherent interfaces between η′ and the matrix led to increased lattice distortion, resulting in electron scattering. • Residual heat quenching can improve the strength of cast Al–Mg–Zn alloys. • The 3D morphology of the Fe-rich phases and pores has been significantly improved. • Mechanical properties enhanced by improvement of Al 6 (FeMn) and the presence of η'. • The semi-coherent interfaces between η′ and matrix reduced the thermal conductivity. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09215093
- Volume :
- 892
- Database :
- Academic Search Index
- Journal :
- Materials Science & Engineering: A
- Publication Type :
- Academic Journal
- Accession number :
- 175027305
- Full Text :
- https://doi.org/10.1016/j.msea.2023.146030