钴磷镀层表面热疲劳裂纹的萌生及扩展机理  

Initiation and Propagation Mechanism of Thermal Fatigue Crack on the Surface of Co-P Coating

作　　者：陈丽娜[1] 尤显卿[1] 杨庆海[1] 刘宝[1] 张焱[2] 

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009 [2]安徽职业技术学院,安徽合肥230051

出　　处：《稀有金属与硬质合金》2010年第1期25-29,共5页Rare Metals and Cemented Carbides

基　　金：安徽高校省级自然科学研究项目(KJ2008B276)

摘　　要：在自约束型热疲劳试验机上对化学镀钴磷合金镀层进行了热疲劳试验,采用光学显微镜、扫描电子显微镜研究了在热应力作用下镀层表面热疲劳裂纹萌生、扩展的方式和形态。结果表明:200次冷热循环后,V型缺口处发生塑性变形,并且随冷热循环的进行,热疲劳裂纹由缺口底部萌生并沿着循环方向扩展。重点分析了钴磷合金镀层表面热疲劳裂纹的萌生及扩展机理。The thermal fatigue tests of Co-P alloy coating prepared by electrolytic plating were performed on a self-restraint thermal fatigue testing machine. The initiation and propagation mode of the thermal fatigue cracks, which were on the surface of the coating and caused by thermal stress, and their morphology were investigated by optieal microscopes and scanning electron microscopes. The results show that there is plas- tic deformation near V-notch after 200 thermal cycles, and the thermal fatigue cracks initiate at the bottom of V-notch and propagate in the thermocycling direction. The initiation and propagation mechanism of the cracks are emphatically analyzed.

关 键 词：化学镀 钴磷镀层表面 热疲劳 裂纹 机理 

分 类 号：TG115.57[金属学及工艺—物理冶金]