采用双悬臂梁试验方法研究了经时效处理的SiCw/2024Al复 合材料在35%NaCl溶液中的应力腐蚀行为，用透射电子显微镜对时效处理后复合材料的微 观组织形貌进行了观察与分析，用扫描电子显微镜观察应力腐蚀试样的裂纹扩展形貌.结果 表明，在3种不同的时效状态下，复合材料内部的微观组织形貌发生了较大的变化，引起3种 时效状态下复合材料的应力腐蚀行为发生变化，相应的裂纹尖端的微观组织形貌也出现了较 大的差别.
〖WT5HZ〗Abstract： 〖WT5BZ〗The stress corrosion cracking behavior of SiCw/2024 Al composite was studied by double cantilever beam test in 3.5%NaCl solution.Tra nsmission electron microscopy observation was carried out on the sample to exa mine the microstructure of SiCw/2024Al composite after ageing treatment.The crac k propagation lengths were measured by optical microscopy.The crack propagation characteristics of stress corrosion were examined by scanning electron microscop y.The results indicated that the microstructures of the aged composite were diff erent,which led to the change of stress corrosion cracking behavior of ageing co mposite.The morphologies of crack tips were also different.The stress corrosion cracking sensibility of SiCw/2024Al composite was the biggest at under ageing st ate.
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