Zn-5Al合金的等径弯曲通道变形  

Equal Angular Channel Processing for Zn-5Al Alloy

作　　者：卢庆亮[1] 闵光辉[1] 王常春[1] 于化顺[1] 

机构地区：[1]山东大学

出　　处：《特种铸造及有色合金》2005年第7期394-396,共3页Special Casting & Nonferrous Alloys

基　　金：教育部留学回国人员科研启动基金资助项目(2003.406)

摘　　要：研究了等径弯曲通道变形过程中Zn5Al合金的组织变化及其显微硬度变化。在变形过程中晶粒首先被拉长,分裂成条带组织,条带组织与晶粒内部缠结的位错发生作用形成位错胞,胞内位错进一步变形后在胞壁集结变为二维晶界,进而形成小角度的亚晶界或者大角度的晶界,使组织细化。TEM结果表明,在150℃的温度下,经过7道次变形后,Zn5Al合金的微观组织得到细化,平均晶粒尺寸在1.0μm以下。同时,合金的维氏硬度从72.5增加到83.8。Microstructure and micro-hardness of Zn-5Al alloy in equal angular channel processes were observed.Firstly,grain was drawn to wear out the ribbon structure,and the dislocation cell was formed by reaction of the ribbon structure with tangle dislocation in grain.Further,dislocation in the cell was deformed to form three dimensional grain boundary to create sub-crystal boundary with small angle and grain boundary with large angle,resulting in the refinement of the microstructure in equal angular channel process.TEM determination indicated that microstructure of the Zn-5Al alloy was refined,average grain size lower than 10μm,and Vickes hardness increases from 72.5 to 83.8 after seven times of deformation at 150 ℃.

关 键 词：Zn-5Al合金 等径弯曲通道变形(ECAP) 维氏硬度 

分 类 号：TG386.31[金属学及工艺—金属压力加工]