电磁搅拌对Mg-Al-Si合金组织的影响  

Effects of Electromagnetic Stirring on Microstructure of Mg-Al-Si Alloy

作　　者：杨必成[1] 杜东朝[1] 朱学新[1] 徐骏[1] 谢丽君[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》2004年第3期26-28,共3页Special Casting & Nonferrous Alloys

基　　金：国家重点基础研究发展规划 ("973")项目 (G2 0 0 0 0 672 0 2 )

摘　　要：研究了不同电磁搅拌频率和不同冷却速度对MgAl9Si合金凝固组织的影响 ,比较了搅拌和不搅拌两种工艺下得到的不同组织。结果表明 ,电磁搅拌能完全抑制树枝晶的形成 ,提高搅拌频率能使α Mg趋于等轴化 ;延长搅拌时间不能改变晶粒形貌 ,只能使组织变得更加粗大 ;此外 ,电磁搅拌还能促进凝固过程中Mg2 Si相的形核。The effects of varying stirring frequency and cooling rate on the microstructure of Mg-Al-Si alloy were examined. The comparison of the stirred microstructure with the non-stirred microstructure was conducted. The results showed that the electromagnetic stirring can completely restrain the formation of dendrites.α-Mg tended to equiaxed grain with the increase in stirring frequency while the grain morphology remained un-change and the microstructure became more coarse with extending the stirring time.In addition,the electromagnetic stirring can promote the nucleation of Mg_2Si phase during solidification.

关 键 词：Mg-Al-Si 电磁搅拌 半固态浆料 组织形貌 

分 类 号：TG27[金属学及工艺—铸造]