摘要
对变形AZ31镁合金在连铸过程中有、无施加电磁场和微钙合金化进行试验研究,并对铸锭的表观质量、微观组织和力学性能进行对比分析。结果表明:微钙合金化和电磁场复合作用能连续铸造出表面光滑、无氧化夹杂和偏析瘤的高质量铸锭,合金的微观组织得到改善,合金的晶粒在铸锭内外一致,析出相呈圆点状或近圆点状弥散分布于基体。微钙合金化和电磁场复合作用对合金抗拉强度的提高近15%,对合金延伸率的改善更加有效,相对于普通连铸的AZ31镁合金,在微钙合金化和电磁场复合作用下AZ31镁合金的延伸率提高近90%。
The continuous castings of wrought magnesium alloy AZ31 with or without the effects of electromagnetic field and Ca microalloying were investigated, and the appearances, microstructures and mechanical properties were compared. The results show that the ingots with the electromagnetic field casting （EMC） and Ca microalloying have smooth surface, and the defects, such as segregation, trapped oxide can be eliminated on the ingot surface. Through EMC and Ca microalloying, the microstructure is improved and the grain in the border and center of the ingot has a same size, the β-Mg17Al12 phases with the shape of dot and approximate dot distribute in the basal body uniformly. The yield strength and elongation increase by 15% and 90%, respectively, for the ingot with EMC and Ca microalloying compared to the ingot without EMC and Ca microalloying.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2009年第9期1608-1612,共5页
Rare Metal Materials and Engineering
基金
国家自然科学基金(50475157)
重点基金(50234022)
教育部重点项目(105052)
关键词
AZ31
微钙合金化
电磁场
AZ31
Ca microalloying
electromagnetic field
作者简介
任政，男，1981年生，博士生，大连理工大学材料学院，辽宁大连116024，电话：0411-84706114，E-mail：renzheng1981@163．com；
通讯作者：张兴国，教授，博士生导师，电话：0411-84706183，E-mail：zxgwj@dlut．edu．cn
