Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 24    No. 10    October 2014

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Microstructures and mechanical properties of extruded and aged Mg-Zn-Mn-Sn-Y alloys
Guang-shan HU1,2, Ding-fei ZHANG1,2, Ding-zang ZHAO1,2, Xia SHEN1,2, Lu-yao JIANG1,2, Fu-sheng PAN1,2

1. College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China;
2. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China

Abstract:The microstructures and mechanical properties of Mg-6Zn-1Mn-4Sn and Mg-6Zn-1Mn-4Sn-0.5Y alloys under extrusion and T6 aging conditions were investigated by optical microscopy (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM) and tensile test. The results show that Y element refines the grains and improves the comprehensive mechanical properties of ZMT614-0.5Y both in as-extruded and T6 states. The phase compositions of Mg-6Zn-1Mn-4Sn-0.5Y are α-Mg, MgZn2, Mn, Mg2Sn and MgSnY phases. After T6 treatment, the ultimate tensile strength (UTS) and yield strength (YS) increase while the elongation decreases severely. For both of these alloys, the theoretical results combined with the experimental values demonstrate that the grain boundary strengthening and solid solution strengthening play an important role in enhancing the YS in the as-extruded state, while the precipitation strengthening is the key factor for the enhancement of YS in the T6 state.


Key words: Mg-Zn-Mn-Sn-Y alloy; yttrium; extrusion; T6; microstructure; strengthening mechanism

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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