摘要
采用等离子喷涂工艺,制备了Mo丝增强的NiAl基单层复合材料。系统地研究了该复合材料的显微组织,Mo丝/NiAl界面的结合特性以及在不同热处理状态下复合材料的界面行为。研究表明:制备态单层复合材料的基体由强烈变形(扁平化)和高速结晶的NiAl熔滴颗粒形成的层状结构构成,颗粒间有较多的分界面,Mo丝/基体的界面结合强度不高,其结合为非冶金结合。800℃,3h退火后,Mo丝/基体界面的结合情况得到改善,复合材料的性能提高。更高温长时处理后,基体元素Ni在Mo丝中形成扩散层,在界面处基体一侧和基体中结晶的熔滴颗粒分界面处的铝的氧化物层明显增厚。
A plasma sprayed monolayer NiAI composite reinforced with Mo fibers was prepared and the microstructure and the interface of Mo/NiAl after various heat treatments were studied. The result showed that the matrix of as-sprayed composite was composed of many NiAl melt droplets of intensive deformation by quick crystallization in layered structure with lots of interfaces between crystallized NiAl-droplets. The Mo/NiAl interface of as-sprayed composite was not metallurgically bonded. After annealing at 800℃ for 3 h, the bonding of Mo/NiAl interface turned better and the performance of composite was improved. After annealing at 1200℃ for 48 h, the Ni-diffusion layer was formed in Mo fiber and the aluminum oxide layers were obviously thickened in the matrix side of Mo/NiAl interface and the interface of crystallized NiAl-droplets in the matrix.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2007年第8期1386-1389,共4页
Rare Metal Materials and Engineering
基金
国家自然科学基金(50420130032和50571005)
