Effects of combined additions of Li and Al–5Ti–1B on the mechanical anisotropy of AZ31 magnesium alloy
Effects of combined additions of Li and Al–5Ti–1B on the mechanical anisotropy of AZ31 magnesium alloy
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DOI：
10.1016/j.matdes.2012.11.032
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发表时间：
2013-04
影响因子：
8.4
通讯作者：
Rui-hong Li;F. Pan;B. Jiang;Qingshan Yang;A. Tang
中科院分区：
文献类型：
--
作者：
Rui-hong Li;F. Pan;B. Jiang;Qingshan Yang;A. Tang
将含有Li和/或Al-5Ti-1B的AZ31镁合金铸造挤压成厚度为2mm的板材。研究了合金的显微组织、拉伸性能和各向异性行为。结果表明：在铸态和挤压态条件下，Li和Al-5Ti-1B均能使AZ31合金的晶粒尺寸减小；AZ31-1Li-0.3 （Al-5Ti-1B）合金具有较好的拉伸性能和改善的各向异性，应变硬化指数为n ~ 0.28。这可以通过织构演变和细化的组织来解释。Li的加入降低了Mg的轴向比（c/a）， Al-5Ti-1B的加入使挤压过程中动态结晶细化晶粒。
AZ31 magnesium alloys with Li and/or Al–5Ti–1B were cast and extruded to sheets with a thickness of 2mm. The microstructure, tensile properties and anisotropy behavior of these alloys were investigated. The results showed that the grain sizes of AZ31 alloys were reduced by combined addition of Li and Al–5Ti–1B both in the as-cast and the extruded conditions. AZ31–1Li–0.3(Al–5Ti–1B) Alloy was found to exhibit better tensile properties and improved anisotropy with a modest strain hardening exponent n∼0.28. This was explained via the texture evolution and the refined microstructure. Li addition decreased the axial ratio (c/a) of Mg and the addition of Al–5Ti–1B refined the grain size through dynamic crystallization during extrusion.