Effect of Y content on microstructure and mechanical properties of as-cast Mg–8Li–3Al–2Zn alloy with duplex structure
Effect of Y content on microstructure and mechanical properties of as-cast Mg–8Li–3Al–2Zn alloy with duplex structure
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DOI：
10.1016/j.msea.2015.10.067
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发表时间：
2016-01
期刊：
影响因子：
6.4
通讯作者：
Jiong Zhao;Jie Zhang;Wencai Liu;Guohua Wu;Liang Zhang
中科院分区：
文献类型：
--
作者：
Jiong Zhao;Jie Zhang;Wencai Liu;Guohua Wu;Liang Zhang
研究了Y对铸态Mg-8Li-3Al-2ZN合金组织和性能的影响。结果表明，Mg-8Li-3Al-2ZN合金的显微组织主要由α-Mg相、β-Li相、AlLi相和MgLiAl2相组成。随着Y的加入，Al2Y化合物逐渐形成并增多，AlLi相减少，β-Li相增多，组织明显细化和等轴化。当Y的加入量为1wt%时，晶粒度最小。Mg-8Li-3Al-2ZN-0.5Y合金具有最佳的拉伸性能组合，其极限抗拉强度、屈服强度和延伸率分别为153.0、218.5和16.9%，分别比Mg-8Li-3Al-2ZN合金的143.8、193.0和14.9%提高了6.4%、13.2%和13.4%。其改善机制与细化晶粒和第二相强化有关。
In this study, effect of Y on microstructure and mechanical properties of as-cast Mg–8Li–3Al–2Zn alloy was investigated. The results show that microstructure of the Mg–8Li–3Al–2Zn alloy mainly consists ofα-Mg,β-Li, AlLi and MgLiAl2phases. With addition of Y, the Al2Y compound forms and increases gradually, the AlLi phase decreases and theβ-Li phase increases, meanwhile, the microstructure is significantly refined and equiaxed. The addition of 1 wt% Y produces the smallest grain size. Mg–8Li–3Al–2Zn–0.5Y alloy exhibits an optimum combination of tensile properties with the ultimate tensile strength, yield strength and elongation of 153.0 MPa, 218.5 MPa and 16.9%, which are improved by about 6.4%, 13.2% and 13.4% compared with those of Mg–8Li–3Al–2Zn alloy (143.8 MPa, 193.0 MPa and 14.9%), respectively. The mechanisms of improvement are related to grain refinement and second phase strengthening.