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OALib Journal期刊
ISSN: 2333-9721
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喷射沉积SiCp/Al-7Si复合材料的疲劳裂纹扩展
DOI: 10.3724/SP.J.1037.2010.00315, PP. 102-108
Keywords: Al-Si合金,SiC颗粒,复合材料,喷射沉积,裂纹扩展,裂纹闭合
Abstract:
采用紧凑拉伸试样进行恒载和降K控制的拉--拉疲劳实验,研究了喷射沉积SiCp/Al-7Si复合材料及其基体的疲劳裂纹扩展行为.通过金相显微镜和扫描电镜观察了复合材料及其基体的组织和疲劳裂纹扩展形貌,研究了SiC颗粒对复合材料疲劳裂纹扩展机制的影响.结果表明复合材料在任何相同的ΔK水平下其抗疲劳裂纹扩展能力优于基体材料,并表现出较高的疲劳门槛值.其原因是复合材料中裂纹裂尖遇到增强颗粒时,裂纹发生偏转,特别是SiC颗粒自身微裂纹萌生有效降低了裂纹尖端的应力强度因子,复合材料的裂纹闭合效应也随之增大.去除裂纹闭合效应的影响,当有效应力因子ΔKeff作为裂纹扩展的驱动力时,复合材料的裂纹扩展速率却高于基体.
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