摘要
在氨基磺酸镍镀液中电铸制备了两种不同SiC微粒含量的复合材料,研究了热处理对复合材料的抗拉强度和微观组织的影响.研究表明,300℃热处理提高了两种复合材料的强度;但600℃热处理却降低了强度.基体金属Ni与SiC颗粒在600℃完全反应后,界面反应产物是Ni3Si、游离石墨和少量的Ni31Si12,并且产生相当于SiC微粒体积8%的微孔.断裂过程经历微裂纹萌生、长大和聚集,以基体断裂、界面脱粘和微粒断裂三种方式进行.
Ni-SiC metal matrix composites with two kinds of SiC content were prepared by electroforming in a nickel sulphamate bath. The effect of heat treatment on tensile strength and microstructure of Ni-SiC composites were investigated. The heat treatment at 300℃ increases tensile strength, but the heat treatment at 600℃ decreases the tensile strength. The complete reaction between nickel and SiC particles can produce shrinkage pores in the interface. In addition, the volume of shrinkage pores is equal to 8% of that of SiC particles in the composites. The interfacial reaction products are composed of Ni3Si and a little amount of Ni31Si12 at 600℃. The fracture process includes microcracks initiation, growth, and coalescence. The cracking of the matrix, debonding of Ni-SiC interface and cracking of particles are three types of cracking modes.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2006年第1期120-123,128,共5页
Journal of Shanghai Jiaotong University
基金
国家高技术研究发展计划(863)项目(2002AA334010)
上海市科委重点新材料项目(035211037)
上海市科技发展基金项目(0211nm052)
