摘要
采用光学金相显微镜、扫描电镜、能谱分析等方法研究了ZK60-xGd(x=0,1.6,2.0)合金的铸态和热挤压态显微组织.研究发现,ZK60合金铸态组织主要由α-Mg枝晶和分布在其周围的半连续网状或不规则片状MgZn相和颗粒状MgZn_2相组成.加入Gd后,MgZn相变为细小均匀的颗粒状,并且随着Gd含量的增加,α-Mg枝晶细化程度和颗粒相分布均匀度提高.Gd在热挤压过程中诱发了合金动态再结晶的进行,显著地细化ZK60-xGd合金挤压态晶粒尺寸,细化程度随着Gd含量的增加而显著提高.结果表明Gd能够显著地细化ZK60铸态和挤压态晶粒,有利于形变镁合金ZK60的变形.
The microstructure of as-cast and extruded ZK60-xGd is studied using optical microstructure, scanning electron microscopy and energy dispersive x-ray. It is found from the study that the cast microstructure of ZK60 alloy is composed mainly of α-Mg dendrites, discontinuous reticulation or irregular sheet MgZn and granular MgZn2. After Gd is added, the MgZn particles become fine and evenly distributed. The refining degree of α-Mg dendrites and the evenness degree of the particle distribution are enhanced with the increase of Gd content. During the hot extrusion, Gd induces the dynamic recrystallization and remarkably refines grains. Also the refining degree is enhanced noticeably with the increase of Gd content. The result indicates that Gd dramatically refines grains of as-cast and extruded ZK60 magnesium alloys, and enhances the wrought performance.
出处
《西安工业大学学报》
CAS
2007年第2期142-147,共6页
Journal of Xi’an Technological University
基金
国家重大基础研究发展规划资助项目(5133002B2)
关键词
ZK60镁合金
GD
再结晶
显微组织
ZK60 Mg alloy
gadolinium
recrystallizatiommicrostructure
