摘要
通过对TZM钼合金中与生成碳化钛相关反应的吉布斯自由能变化的计算,与钼的有关相图比较,分析在粉末冶金TZM钼合金烧结过程中碳化物的形成方式和机制。结果表明:不同于熔炼TZM,在真空烧结过程中TiC是以Ti+C=TiC的方式在粉末颗粒相界面、晶界亚晶界等处原位生成,少量TiC在烧结后的降温过程中在晶内析出;Zr元素部分以单质存在,部分在高温下与Mo形成固溶体,在降温过程中析出Laves相Mo2Zr;在Zr颗粒边缘易于形成ZrC,晶内则不易形成ZrC。
The formation and mechanism of carbide in powder metallurgy TZM molybdenum alloys during the sintering process were analyzed through the calculation of Gibbs free energy in the relative reactions of titanium carbide formation and the comparison of Mo phase diagrams. Results show that different from melt TZM, TiC is in situ produced by the route of Ti+C=TiC during the vacuum sintering process, and it is located at the phase boundaries of powder particles, the grain boundaries and the sub-grain boundaries. And a little TiC precipitates in the cooling process after sintering. Some Zr element exist in the form of simple substance while some forms the solid solution with Mo at high temperature, while precipitates the Laves phase Mo2Zr.ZrC is easily formed in the edge of Zr particles but hard in the grains.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2011年第S2期210-214,共5页
Rare Metal Materials and Engineering
关键词
吉布斯自由能
钼合金
碳化钛
碳化锆
Gibbs free energy
molybdenum alloy
titanium carbide
zirconium carbide
