SiC晶须增强6061Al基复合材料的热机械疲劳性能 Ⅱ.疲劳寿命与损伤机制  

THERMO-MECHANICAL FATIGUE OF SiC WHISKER REINFORCED 6061Al COMPOSITES Ⅱ. Fatigue Life and Damage Mechanism

作　　者：钱立和[1] 王中光[1] 户田裕之 小林俊郎 

机构地区：[1]中国科学院金属研究所材料疲劳与断裂国家重点实验室,沈阳110016 [2]日本丰桥技术科学大学生产系统工程系

出　　处：《金属学报》2001年第11期1203-1207,共5页Acta Metallurgica Sinica

基　　金：国家重点基础研究资助项目G19990650

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．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.

关 键 词：热机械疲劳 疲劳寿命 碳化硅晶须 铝基复合材料 

分 类 号：TB333[一般工业技术—材料科学与工程]