Effect of Sr on microstructure and mechanical properties of Mg-9Li-3Al alloy

摘要：

Mg-9Li-3Al-xSr alloys were prepared in vacuum furnace under the protection of argon atmosphere. Effects of Sr content on microstructure and mechanical properties of as-cast Mg-9Li-3Al alloys were investigated. The results indicate that α-Mg and β-Li phases exist in all alloys. The addition of Sr causes grain refinement of the test alloys and new Al4Sr phase is formed in the alloys. The mechanical properties of alloys initially increase and then decrease with the increase of Sr content. Sr has obvious refining effect on the alloys and the distribution of Al4Sr phase is much more uniformly when Sr content is 2.5wt％,. The as-cast Mg-9Li-3Al-2.5Sr alloy exhibits an optimum combination of mechanical properties with the ultimate strength, yield strength and elongation of 186MPa, 149MPa and 11％ respectively, improving obviously compared with Mg-9Li-3Al alloy. With the continuing increase of Sr content, the mechanical properties of the test alloys decrease.

关键词： Mg-Li alloys Sr microstructure mechanical properties

作者: YANG Yan PENG Xiaodong XIE Weidong WEI Qunyi CHEN Gang SU Zhonghua

作者单位: College of Materials Science and Engineering, Chongqing University, Chongqing400045, China College of Materials Science and Engineering, Chongqing University, Chongqing400045, China National

会议类型: 国际会议

会议名称: 11th IUMRS International Conference in Asia(第十一届国际材联亚洲材料大会 IUMRS-ICA 2010)

会议地点: 青岛

会议语种:英文

页码: 84-89

在线出版日期: 2010-09-25（万方平台首次上网日期，不代表论文的发表时间）