首页|(111709)Microstructural evolution and mechanical property of Al-Mg-Mn alloys with various solidifcation cooling rates
(111709)Microstructural evolution and mechanical property of Al-Mg-Mn alloys with various solidifcation cooling rates
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NSTL
Elsevier
In the present work, the microstructural evolution and mechanical property of as-cast Al-6 Mg-0.8Mn alloys with respect to the solidifcation cooling rate was investigated. The results demonstrate that as the cooling rate increases from 0.5 K/s to 46.9 K/s, the average grain size decreases frstly and then increases slightly; the average secondary dendrite arm spacing, the average length of Al6Mn and Al3Mg2 phases decreases. A high cooling rate (21.3 K/s and 46.9 K/s) causes the increase in the solute segregation/shrinkage porosities, and a low cooling rate (0.5 K/s) leads to the formation of casting defects, thus deteriorating the mechanical properties of alloys. The alloy with the cooling rate of 5.4 K/s shows an optimum mechanical property i.e., the tensile strength, yield strength, and elongation are 298.7 MPa, 133.8 MPa, and 30.5%, respectively. The enhanced strength-ductility synergy is mainly attributed to the refned secondary dendrite arm spacing and reduced casting defects. This work provides a reference for the fabrication of as-cast Al-Mg-Mn alloys with excellent mechanical performance.
NSTL
Elsevier
