【作者】 胡津； 徐丽新； 姚忠凯；

【Author】 Hu jin Xu Lixin Yao Zhongkai (School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001)

【机构】 哈尔滨工业大学材料科学与工程学院；

【摘要】 采用双悬臂梁试验方法研究了经时效处理的SiC_w/2024Al复合材料在3.5%NaCl溶液中的应力腐蚀行为,利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,采用扫描电子显微镜观察应力腐蚀试样的裂纹扩展形貌。研究结果表明,在三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,从而引起三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。更多还原

【Abstract】 The stress corrosion cracking behavior of SiCw/2024A1 composite was studied by double cantilever beam test in 3.5 % NaCl solution. Transmission electronic microscopy observation was carried out on the sample to examine the mi-crostructures of SiCw/2024Al composite after ageing treatment. The crack propagation characteristics of stress corrosion were examined by scanning electron microscopy. The results indicated that the microstructures of the aged composite are different which led lo the stress corrosion cracking behavior of ageing composite changed. The morphologies of crack tips are also different.更多还原