【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.更多还原

【Abstract】 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.更多还原