摘要
采用粉末冶金法制备了Ti-Nb-Cr-C掺杂钼合金,对其组织形貌、粒度和成分进行分析,并对球磨过程氧化物生成及烧结过程碳化物生成的热力学进行讨论。结果表明,第二相颗粒主要分布于钼晶粒的晶界上,当Nb含量较多时也可分布于晶粒内部,其主要成分是Nb、Ti和C,根据热力学分析可能是Nb和Ti的复合碳化物。第二相颗粒的存在可细化钼合金晶粒,当Nb加入量为3%时晶粒细化最明显。Cr元素主要以固溶态存在于钼合金中。
The Ti-Nb-Cr-C doped molybdenum alloy was prepared by powder metallurgy, and its microstructure, particle size and composition were analyzed. Thermodynamics was discussed of oxide generation during ball milling and carbide formation during sintering. The results show that the second phase particles are mainly distributed on the grain boundary, and also distributed inside the grain when Nb content is eno- ugh. The second phase mainly contains Nb,Ti and C,possibly being composite carbides of Nb and Ti based on the thermodynamics analysis. The second phase particles can refine the grains of molybdenum alloy, and the effect of grain refinement is strongest with Nb content of 3 %. Cr exists in molybdenum alloy mainly in the form of solid solution.
出处
《稀有金属与硬质合金》
CAS
CSCD
北大核心
2013年第5期19-24,共6页
Rare Metals and Cemented Carbides
