A comparison between DCCAE and conventional extrusion of Mg-9.5Li-3Al-1.6Y alloy
来源期刊：Journal of Rare Earths2016年第6期
论文作者：刘军威 彭晓东 王宝 魏国兵 谢卫东 杨艳 刘明朴
文章页码：626 - 631
摘 要：Double change channel angular extrusion（DCCAE） was performed in dual-phase Mg-9.5Li-3Al-1.6Y（wt.%） alloy to develop fine-grained microstructures. The microstructure evolution during DCCAE and conventional extrusion（CE） was investigated. The microstructure of the extruded dual-phase Mg-Li alloy consisted of recrystallized β-Li grains, banded α-Mg phases, and Al2Y phases distributed in β-Li phases and phase-interface uniformly. Compared with CE, the specimens after DCCAE had smaller β-Li grain size（3–5 μm by the DCCAE and 6–10 μm by the CE） and the α-Mg phases were refined during the DCCAE. The distribution of the Al2 Y phases was improved a lot by DCCAE. Furthermore, the specimens after DCCAE had better tensile strength than conventional extrusion ones.
刘军威1，彭晓东1,2，王宝1，魏国兵1,2，谢卫东1，杨艳1，刘明朴3
1. College of Materials Science and Engineering Chongqing University2. National Engineering Research Center for Magnesium Alloys3. Zhengzhou Coal Mining Machinery Group Co. Ltd.
摘 要：Double change channel angular extrusion（DCCAE） was performed in dual-phase Mg-9.5Li-3Al-1.6Y（wt.%） alloy to develop fine-grained microstructures. The microstructure evolution during DCCAE and conventional extrusion（CE） was investigated. The microstructure of the extruded dual-phase Mg-Li alloy consisted of recrystallized β-Li grains, banded α-Mg phases, and Al2Y phases distributed in β-Li phases and phase-interface uniformly. Compared with CE, the specimens after DCCAE had smaller β-Li grain size（3–5 μm by the DCCAE and 6–10 μm by the CE） and the α-Mg phases were refined during the DCCAE. The distribution of the Al2 Y phases was improved a lot by DCCAE. Furthermore, the specimens after DCCAE had better tensile strength than conventional extrusion ones.
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