Cu对准晶增强MgZn_6 Y_1合金组织和高温性能的影响

Effects of Cu on Microstructure and Elevated Temperatures Properties of Mg-6Zn-1Y Alloy Containing Icosahedral Quasicrystals Phase

在准晶增强MgZn_6 Y_1合金中添加Cu元素,考察Cu添加量对合金铸态组织和高温性能的影响。结果表明,随着Cu添加量的增加,MgZn_6 Y_1合金的铸态组织逐步细化。但当添加量超过1.5%(摩尔分数)后,合金组织反而有粗化的趋势。随着Cu添加量的增加,合金的高温(200℃)力学性能呈先上升后下降的趋势。当Cu添加量为1.5%时,合金的高温抗拉强度和伸长率相比未处理合金分别提高了26.4%和49.3%。添加Cu后,合金的高温蠕变性能得到显著增强。

Effects of Cu on microstructure containing icosahedral quasicrystals phase and elevated temperature properties of as-cast Mg-Zn-Y alloy were investigated. The results reveal that, with increasing in Cu content, microstructure of the MgZn6Y1 alloy can be further refined. However, with Cu content more than 1.5% （in atom）, the grain size of alloy is coarsened. The addition of Cu can improve the ele- vated temperature mechanical properties of MgZn6Y1 alloy. The tensile strength and elongation of Mg- Zn6Y1Cul.s alloy reach 153 MPa and10.6% ,compared with those of MgZn6Y1 alloy,increased by 26.4% and 49.3 %, respectively. The creep resistance of MgZn6Y1Cu1.5 alloy is superior to that of MgZn6 Y1 under the same creep conditions.