Densification and grain growth during isothermal sintering of Mo and mechanically alloyed Mo–TZM
Densification and grain growth during isothermal sintering of Mo and mechanically alloyed Mo–TZM
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DOI：
10.1016/j.actamat.2009.05.013
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发表时间：
2009-08
期刊：
影响因子：
9.4
通讯作者：
S. Majumdar;S. Raveendra;I. Samajdar;P. Bhargava;I. Sharma
中科院分区：
文献类型：
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作者：
S. Majumdar;S. Raveendra;I. Samajdar;P. Bhargava;I. Sharma
研究了纯钼和机械合金化Mo-TZM（Mo-0.6Ti-0.2Zr-0.02C）在1000-1800°C范围内的等温烧结行为。密度增量的对数与时间呈线性关系。虽然体积扩散已被发现是主要的烧结机制，晶界扩散的显着贡献也被确定。从收缩数据获得的扩散系数（Dv）和晶粒生长过程中的晶界迁移率（Mb）被发现是较低的Mo-TZM由于在显微组织中的碳化物的存在。由于显微组织中碳化物和孔隙的存在，晶界迁移受到限制。
Isothermal sintering behavior of pure molybdenum (Mo) and mechanically alloyed Mo–TZM (Mo–0.6Ti–0.2Zr–0.02C) has been investigated in the temperature range 1000–1800°C. A linear relationship has been found to exist between logarithms of increment in density and time. Although the volume diffusion has been found to be the dominant sintering mechanism, a significant contribution from grain boundary diffusion is also identified. Both the diffusion coefficients (Dv) obtained from shrinkage data and the grain boundary mobility (Mb) during grain growth are found to be lower for Mo–TZM due to the presence of carbides in the microstructure. The grain boundary migration is restricted due to the presence of carbides and porosities in the microstructure.