MgCO_3添加量及搅拌处理对ZM5合金微观组织的影响  

Effects of MgCO_3 addition and stir processing on microstructure of ZM5 alloy

作　　者：尹冬松[1] 解维生[2] 毛丽贺[3] 高海东[4] 刘军[2] 杨光山[2] 孟凡奇[2] 刘爱莲[4] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院,哈尔滨150001 [2]中航工业哈尔滨东安发动机集团有限公司,哈尔滨150000 [3]天津工业大学先进纺织复合材料教育重点实验室,天津300387 [4]黑龙江科技大学材料科学与工程学院,哈尔滨150022

出　　处：《天津工业大学学报》2016年第1期70-74,共5页Journal of Tiangong University

基　　金：国家自然科学基金项目(51201062)

摘　　要：研究MgCO3加入质量分数(0.25%至1.75%)和搅拌时间对ZM5合金晶粒尺寸的影响规律,结果表明:在ZM5中添加MgCO3质量分数为0.25%时,ZM5合金晶粒尺寸明显降低,MgCO3添加量继续增加,合金晶粒尺寸继续降低,当MgCO3加入质量分数为1.00%时,细化效果最好,晶粒尺寸为240μm;当MgCO3加入质量分数超过1.00%时,晶粒发生粗化现象,合金强度在此时也达到峰值.随着搅拌时间增加,合金晶粒尺寸显著降低,当MgCO3搅拌时间为20 min时,细化效果最好,晶粒尺寸为270μm;继续增加搅拌时间,晶粒不再细化.通过扫描电镜和能谱分析可知,ZM5合金由α-Mg和细小条状晶界相组成,α-Mg为含有Al的过饱和固溶体,晶界相为Al12Mg17.The effects of MgCO3 addition and the time of stir processing on microstructure of ZM5 alloy were investigated. Results show that the grain size decreases obviously when the MgCO3 addition is 0.25%. With the addition amount of MgCO3 increases, the grain size of ZM5 decreases. The optimal refining effect can be obtained when the MgCO3 addition amount is 1.00%, and the grain size is 240 μm. Grain coarsening phenomenon occurs when the MgCO3 addition exceeds 1.00%. The effect of stir processing time on grain size of ZM5 alloy was investigated. Results show that the refining effect is optimal when the stir processing time is 20 min, and the grain size is 270 μm. The refining effect becomes unfavorable when the stir processing time exceeds 20 min. SEM and XRD analyses show that ZM5 alloy is composed of α-Mg and small strips of grain boundary phase. The α-Mg is a supersaturated solid solution containing Al and its grain boundary phase is Al12Mg17.

关 键 词：ZM5合金 MGCO3 微观结构 搅拌处理 细化 

分 类 号：TG146.2[一般工业技术—材料科学与工程]