A comparison between DCCAE and conventional extrusion of Mg-9.5Li-3Al-1.6Y alloy

详细信息    查看全文

• 作者：Junwei LIU (刘军威)^a ; Xiaodong PENG (彭晓东)^a ; ^b ; ^{pxd@cqu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Bao WANG (王 宝)^a ; Guobing WEI (魏国兵)^a ; Weidong XIE (谢卫东)^a ; ^b ; Yan YANG (杨 艳)^a ; Mingpu LIU (刘明朴)^c
• 关键词：DCCAE ; dual-phase ; Mg-Li alloy ; Al2Y ; fine-grained ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：34
• 期：6
• 页码：626-631
• 全文大小：1510 K

文摘

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 Al₂Y phases was improved a lot by DCCAE. Furthermore, the specimens after DCCAE had better tensile strength than conventional extrusion ones.