Mo-Zr合金烧结致密化行为及组织与性能研究  

Sintering Densification Behavior, Microstructure and Property of Mo-Zr Alloys

作　　者：钱昭[1] 范景莲[1] 成会朝[1] 田家敏[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《稀有金属材料与工程》2013年第10期2144-2148,共5页Rare Metal Materials and Engineering

基　　金：国家杰出青年科学基金资助(50925416)

摘　　要：采用粉末冶金方法制备Mo-Zr合金,研究Zr对Mo-Zr合金烧结致密化行为及其组织与性能的影响。结果表明,合金烧结后接近全致密,固相Mo颗粒间的固相烧结是导致合金致密化的主要原因;合金室温抗拉强度相对于纯Mo显著提高,且随Zr含量增加合金强度持续上升;提高压制压力使合金致密度改善,但对合金性能影响并不显著,而提高烧结温度对合金性能产生不利影响,1920℃烧结的合金具有最佳性能。少部分Zr原子固溶进入Mo基体中产生显著固溶强化作用,大部分Zr则吸附坯体中的氧元素形成氧化物二次相粒子弥散分布于晶界和晶粒内部,净化晶界氧的同时,使合金晶粒得以显著细化。Mo-Zr alloys were fabricated via a powder metallurgy method.The effects of Zr on sintering densification behavior,microstructure and property of Mo-Zr alloy were studied.The results indicate that the alloy with Zr addition approach full density after sintering,and the solid phase sintering between Mo particles is the main cause for the densification of the alloy.The tensile strength at room temperature of the alloy is effectively enhanced after adding Zr,and continues to rise with the increasing of Zr content.Enhancing the pressing pressure leads to a better density but not to the tensile strength,while increasing sintering temperature will do harm to the property of the alloy.The microstructure analysis reveals that a little part of Zr solves into Mo matrix,which enhances the tensile strength of the alloys signally,while other part of Zr form oxide second phase particles dispersing throughout grain boundary and inner grain and making the grains to be significantly refined.

关 键 词：Mo-Zr合金 致密化 固溶强化 二次相粒子 

分 类 号：TF12[冶金工程—粉末冶金] TG146.412[冶金工程—冶金物理化学]