【摘要】 研究了本积分数为１５％和２８％ＳｉＣＷ／６０６１Ａｌ基复合材料的同相和反相热机械疲劳寿命和损伤机制．结果表明：在小应变范围时，同相比反相疲劳寿命长，而在大应变时，同相疲劳寿命接近（对于２８％ＳｉＣＷ）、甚至短于（对于１５％ＳｉＣＷ）反相热机械疲劳寿命；１５％ＳＩＣＷ／６０１６Ａｌ基复合材料的反相热机械疲劳寿命高于２８％ＳｉＣＷ／６０１６Ａｌ基复合材料的寿命．两种材料的同相热机械疲劳寿命曲线存在交叉点，寿命高低取决于应变水平；同相和反相热机械疲劳的损仿均为空洞在ＳｉＣ晶须周围基体中形核、长大和连接．更多还原

【Abstract】 The In- phase (IP) and out-of-phase (OP) thermo-mechanical fatigue (TMF) life and damage mechanism were studied on 15% SiCw (volume fraction) and 28%SiCw/6061Al. The result indicates that in small strain range, the IP TMF life is longer than that of the OP-TMF; in large strain range it is close to(for 28%SiCw) or even shorter tIlan the OP TMF life (for 15%SiCw). A comparison of the fatigue lives between the two composites illustrates that in the case of the OP-TMF, 15%SiCw/6061Al shows longer life than 28% SiCw/6061Al, however, in the case of IP-TMF, there is a crossover between the fatigue life curves of the two composites, meaning that the life being longer or shorter depends on strain level. Their damage processes are all related to initiation, growth and coalescence of voids in the matrix around whiskers.更多还原