镁合金铸态组织的影响
(1. 重庆大学 材料科学与工程学院，重庆400030；
2. 重庆大学 国家镁合金材料工程技术中心，重庆400030；
3. 重庆工学院 材料科学与工程学院 重庆400050)
摘 要: 研究Mg-9Sr中间合金及其处理工艺对AZ31镁合金铸态组织的影响。结果表明：在AZ31镁合金中加入不同状态的Mg-9Sr中间合金(常规铸态、快速凝固态、固溶态和轧制态)对AZ31镁合金均有很好的晶粒细化效果，其中轧制态Mg-9Sr中间合金的细化效果最好，其次依次为固溶态、常规铸态和快速凝态Mg-9Sr中间合金。在Sr加入量0.1%和熔体保温时间80 min条件下，轧制态Mg-9Sr中间合金可使AZ31镁合金获得62 μm的最小平均晶粒尺寸。
关键字: AZ31镁合金；Mg-Sr中间合金；晶粒细化；Mg17Sr2相
microstructure of AZ31 magnesium alloy
（1. College of Material Science and Engineering, Chongqing University, Chongqing 400030, China;
2. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400030, China;
3. College of Material Science and Engineering, Chongqing Institute of Technology, Chongqing 400050, China）
Abstract:The effects of Mg-9Sr master alloys with different states on the as-cast microstructure of AZ31 magnesium alloy were investigated. The results show that adding Mg-9Sr master alloys with different states (conventional as-cast, rapid-solidified, solutionized and rolled) to AZ31 magnesium alloy can effectively refine the as-cast microstructure of the alloy. The refinement efficiency of Mg-9Sr master alloy with rolled state is the best, followed by the solutionized, conventional as-cast and rapid-solidified Mg-9Sr master alloys, respectively. After treated with the rolled Mg-9Sr master alloy for 0.1%Sr and melt holding time of 80 min, the AZ31 magnesium alloy is found to obtain a minimum average grain size of 62 μm.
Key words: AZ31 magnesium alloy; Mg-Sr master alloy; grain refining; Mg17Sr2 phase
