浇注温度对Mg-10Sm合金凝固组织的影响  

Effects of Pouring Temperatures on Microstructure Evolution of Mg-10Sm Alloy

作　　者：李大全[1] 王光宗[1] 梁小康[1] 许小静[1] 朱强[1] 

机构地区：[1]北京有色金属研究总院

出　　处：《特种铸造及有色合金》2015年第3期248-251,共4页Special Casting & Nonferrous Alloys

基　　金：国家青年自然科学基金资助项目(51101020)

摘　　要：在不同浇注温度下浇注Mg-10Sm合金,研究了浇注温度对Mg-10Sm合金凝固组织的影响。结果表明,随着浇注温度的降低,试样外部粗大柱状树枝晶区逐渐缩小,浇注温度在700℃及以下,外部柱状晶区消失,转化为细小等轴晶;试样心部粗大树枝晶逐渐细化并转变为细小的等轴晶。二次枝晶间距随着浇注温度的降低逐渐减小。浇注温度对合金共晶相体积分数、共晶相分布以及共晶相形貌没有明显的影响。Effects of different pouring temperatures such as 750,730,700,675 and 650 ℃ on microstructure evolution of metal mold casting Mg-10 Sm alloy were investigated.The results reveal that the grain size of the Mg-10 Sm alloy is significantly refined,and the microstructure is transformed from big columnar and quiaxed dentrite grains to small equiaxed grains with decreasing in the pouring temperatures.The second dendrite arm spacing（SDAS）is gradually decreased with decreasing in the pouring temperatures.Effects of pouring temperature on the eutectic volume fraction,eutectic distribution and eutectic morphology can be ignored.

关 键 词：Mg-10Sm 浇注温度 微观组织 共晶相 

分 类 号：TG292[金属学及工艺—铸造]