采用双悬梁试验方法，研究了不同温度的退火处理对纯铝基复合材料及LY12铝基复合材料应力腐蚀开裂行为的影响。应力测试及透射电镜观察结果表明，不同温度的退火处理通过松弛复合材料的残余应力腐蚀裂纹稳态扩展速率降低；临界应力场强度因子K ISCC增高；复合材料的应力腐蚀敏感性显著改善。
The aluminum matrix composite reinforced by SiC whisker have been extensively studied because of their excellent properties.But little was known about the stress corrosion cracking (SCC)behavior of SiCw/Al composite.In the present research,the effect of annealing treatment on the SCC behavior of SiCw /Al and SiC/2024 composites was investigated using Double-Cantilever-Beam(DCB)specimen in 3.5%NaCl solution.The results indicated that annealing treatment improved the SCC behavior of the two composites by residual stress and changing matrix microstructure.With the increase in annealing temperature,the SCC propagation rate of the two composites decreased and the K ISCC increased.The TEM observation showed that dislocation density in matrix of the composites decreased greatly after annealing treatment.As a result,the sensibility to SCC of the composites was improved.
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