Mo-30Cu合金轧制变形组织及性能研究  

Deformation,Microstructures and Properties of Rolled Mo-30Cu Alloy

作　　者：雷虎[1] 崔舜[1] 林晨光[1] 李增德[1] 周增林[1] 胡晓康[1] 

机构地区：[1]北京有色金属研究总院粉末冶金及特种材料研究所,北京100088

出　　处：《稀有金属》2011年第6期945-949,共5页Chinese Journal of Rare Metals

基　　金：国家863计划资助项目(2006AA03A220)

摘　　要：对粉末冶金法制备的Mo-30Cu合金板材,在不同工艺条件下进行轧制试验,采用金相显微镜及扫描电镜对轧制变形后的组织进行观察,并采用维氏硬度计对经过不同道次变形量的材料进行硬度测试,研究合金的轧制变形性能及组织演变。研究发现,热轧温度为900℃、变形量达到50%时,板材试样轮廓清晰,Mo颗粒被压扁拉长,呈椭球状,烧结态组织转变为变形组织。总变形量为98%的Mo-30Cu合金箔材组织中,Mo相与Cu相均被压成纤维状,两相成均匀层叠分布,Mo层与Mo层、Mo与Cu层间界面清晰,彼此结合紧密。Mo-30Cu合金的轧制变形行为分为3个阶段:总变形量小于50%时,Mo颗粒在Cu相中滑移及Cu相变形;变形量介于50%～90%时,Mo相和Cu相协调变形;变形量大于90%时,Mo相变形。经热轧变形后的Mo-30Cu合金,当冷轧变形量为0%～25%时,由于加工硬化,维氏硬度呈直线上升;当冷轧变形量大于25%时,随着变形量的增加,钼骨架和铜相逐渐变形形成纤维组织,位错密度的增长趋势逐渐减弱,加工硬化效应也会逐渐低于线性增长规律,同时晶格畸变能增加,产生变形热效应,促使材料中产生回复过程,材料的硬度增加缓慢。The plate of Mo-30Cu alloy prepared by powder metallurgy was rolled under different techniques parameters.The deformation property and microstructure evolution of the alloy were deserved by using optical microstructure and scanning electron microscope.The hardness of the materials with different deformation was tested.The results showed that under 900℃ with 50% deformation,the sample still had perfect surface profile,the Mo particles were squashed and elongated to ellipsoids and the sintered structure turned into deformation microstructure.The Mo phase and the Cu phase in the Mo-30Cu alloy with 98% total deformation were pressed into fibrous,uniformly distributed as layered stacks.The interfaces between the Mo-Mo layers,Mo-Cu layers,were clear and combined tightly.The deformation behavior of rolled Mo-30Cu alloy was divided into three stages： less than 50% deformation rate,Mo particles slipped in the Cu phase and the Cu phase deformed;from 50% to 90%,the Mo phase and the Cu phase were coordinately deformed;more than 90%,the Mo phase distorted.After the Mo-30Cu alloy was hot-rolled,when the cold reduction was between 0% to 25%,the Vickers hardness increased as linearity due to work-hardening;when the deformation quantity of cold rolling exceeded 25%,the molybdenum skeleton and Cu phase gradually deformed to fibrous tissue with the increase of the deformation,the work-hardening effect would be lower than the linear growth law for the growth trend of the dislocation density gradually weakened,besides the deformation heat effect occurred for the energy increase of the lattice distortion so as to generate reversion in the material,as a result,the hardness of the alloy increased slowly.

关 键 词：变形性能 组织演变 硬度 

分 类 号：TG335.12[金属学及工艺—金属压力加工]