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用微电极法和 pH 试纸法直接测定了 Ti-5 Al-2.5Sn 和 Ti-5 Al-4V 在近中性3.5%wt.NaCl 水溶液中应力腐蚀裂纹顶端溶液的 pH 值,结果在1.7到2.0范围内。模拟实验的结果与上述结果一致。金相跟踪观察证明上述钛合金应力腐蚀裂纹的扩展过程是首先在裂纹前端的塑性区中形成若干小裂纹,然后主裂纹与小裂纹相对扩展并最后连通。用扫描电镜检查了应力腐蚀开裂(SCC)断口形貌。基于这些结果,作者提出并讨论了钛合金 SCC 的模型。
The pH value of Ti-5 Al-2.5Sn and Ti-5Al-4V solution in the near-neutral solution of 3.5% wt.NaCl stress corrosion cracking solution was measured directly by microelectrode method and pH paper method. The results showed that in the range of 1.7 to 2.0 Range. The simulation results are in accordance with the above results. Metallographic tracking observation shows that the above-mentioned titanium alloy stress corrosion cracking process is the expansion of the first crack in the plastic zone in the formation of a number of small cracks, and then the main crack and small crack relative expansion and finally connected. The morphology of stress corrosion cracking (SCC) fracture was examined by scanning electron microscopy. Based on these results, the author proposed and discussed the model of titanium alloy SCC.