Enhancing the corrosion resistance of titanium alloys in hot nitric acid environments is imperative for advancing spent fuel reprocessing. Here, we explored the impact of Al alloying on microstructure and corrosion resistance of Ti-Al alloys via experimental assessments and theoretical computations. Results indicated that Al alloying induced a comparable Widmanstatten structure and increased hardness. Electrochemical findings demonstrated the optimal corrosion resistance for the alloy with 4 wt% Al. DFT computation presented the highest and the lowest for Ti-4Al alloy, indicative of superior thermodynamic stability. Eventually, a mechanistic understanding of Al alloying on nitric acid corrosion resistance was proposed.

中文翻译：

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探讨Al合金化对Ti-xAl(x=0,1,2,3,4,5)合金显微组织和耐热硝酸腐蚀性能的影响

提高钛合金在热硝酸环境中的耐腐蚀性对于推进乏燃料后处理至关重要。在这里，我们通过实验评估和理论计算探讨了Al合金化对Ti-Al合金显微组织和耐腐蚀性的影响。结果表明，铝合金产生了类似的魏氏组织并增加了硬度。电化学研究结果表明，含 4 wt% Al 的合金具有最佳的耐腐蚀性。 DFT 计算显示 Ti-4Al 合金最高和最低，表明其具有优异的热力学稳定性。最终，提出了铝合金对硝酸腐蚀性能的机理理解。