流变挤压铸造Mg-6Zn-3RE-1.4Y镁合金的组织  

Microstructure of Mg-6Zn-3RE-1.4Y Alloy Produced by Rheo-Squeeze Casting

作　　者：方晓刚 吴树森[1] 赵立[1] 吕书林[1] 安萍[1] 

机构地区：[1]华中科技大学材料成形与模具技术国家重点实验室

出　　处：《特种铸造及有色合金》2015年第1期39-43,共5页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51275183);高等学校博士学科点专项科研基金资助项目(20120142110002)

摘　　要：采用超声振动制备了Mg-6Zn-3RE-1.4Y新型镁合金的半固态浆料,并对半固态浆料进行直接挤压铸造。研究了流变挤压铸造Mg-6Zn-3RE-1.4Y镁合金的组织和相组成。结果表明,Mg-6Zn-3RE-1.4Y合金流变挤压铸件组织中存在两种细小圆整但尺寸差异较大的α1-Mg和α2-Mg晶粒,α1-Mg平均晶粒尺寸和形状系数分别为22μm和0.74,α2-Mg为浆料中剩余液相形成的以球形为主的细小晶粒。合金的相组成主要为α-Mg基体、α-Zr以及沿晶界分布的Mg12Ce、Mg12La以及I-Mg3Zn6Y相。The semi-solid slurry of a novel Mg-6Zn-3RE-1.4Yalloy was prepared by ultrasonic vibration（USV）.Then the slurry was formed by direct squeeze casting（SC）.The microstructure and phase constitutent of Mg-6Zn-3RE-1.4Yalloy produced by rheo-squeeze casting were investigated.The results show that there exist two-type fine and spherical particles（α1-Mg andα2-Mg）different in size.The average diameter and shape coefficient ofα1-Mg particles reach 22μm and 0.74,respectively,andα2-Mg grains are mainly spherical and fine particles formed from the remaining liquid of the slurry.The phase constitutent of the alloy are mainly not onlyα-Mg matrix、α-Zr but also Mg12Ce、Mg12La and I-Mg3Zn6 Y which distributed along the crystal interface.

关 键 词：流变挤压铸造 超声振动 Mg-6Zn-3RE-1.4Y合金 组织 

分 类 号：TG292[金属学及工艺—铸造] TG146.22[一般工业技术—材料科学与工程]