Solidification Behavior of in situ TiB_(2)/Cu Composite Powders during Reactive Gas Atomization

作     者：JIANG Yihui ZHANG Mingshu LI Yufa HE Jiangtan CAO Fei LIANG Shuhua 姜伊辉;ZHANG Mingshu;LI Yufa;HE Jiangtan;CAO Fei;梁淑华

作者机构：Shaanxi Province Key Laboratory for Electrical Materials and Infiltration TechnologyXi'an University of TechnologyXi'an 710048China 

出 版 物：《Journal of Wuhan University of Technology(Materials Science)》 (武汉理工大学学报（材料科学英文版）)

年 卷 期：2021年第36卷第2期

页      面：203-208页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：Funded by the National Natural Science Foundation of China(Nos.U1502274 and 51834009) 

主　　题：composite powder reactive gas atomization solidification microstructure evolution 

摘      要：2wt%TiB_(2)/Cu composite powders were fabricated in situ by reactive gas *** fabricated composite powder exhibits high sphericity,and the powder sizes range from 5μm to 150μ*** morphology of the Cu matrix and the distribution of the TiB2 particles in the composite powders vary with the powder *** critical transitions of interface morphologies from dendritic-to-cellular and cellular-to-planar interfaces occurs when the composite powder sizes decrease to 34μm and 14μm,*** with pure Cu droplets,the composite droplets undergo critical transition of the interface morphologies at a smaller droplet size corresponding to a higher cooling rate because the existence of TiB2 particles can cause instability in the advancing solidification front and heterogeneous *** decreasing powder size,the extent of the TiB_(2) particle interdendritic segregation decreases as the result of enhanced engulfment of TiB2 particles by the advancing solidification front.