Laser shock peening (LSP), as a post-treatment process, was employed to improve the corrosion resistance of Ti45Al8Nb alloy fabricated via laser melting deposition (LMD). Microstructure analysis indicated that nanograins and nanotwins structures were formed on the surface layer of LSP-treated Ti45Al8Nb alloy, accompanied by high-density dislocations and stacking faults. Electrochemical results showed that LSP improves the corrosion resistance of Ti45Al8Nb alloy. The formation of nanograins, nanotwins and compressive residual stress during LSP was conductive to dense oxidation films, thus improving the corrosion resistance of the as-deposited Ti45Al8Nb alloy.

中文翻译：

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激光熔化沉积TiAl合金的激光冲击喷丸增强其耐腐蚀性能

激光冲击喷丸（LSP）作为一种后处理工艺，用于提高激光熔化沉积（LMD）制备的Ti45Al8Nb合金的耐腐蚀性能。显微组织分析表明，LSP处理的Ti45Al8Nb合金表层形成纳米晶和纳米孪晶结构，并伴有高密度位错和堆垛层错。电化学结果表明LSP提高了Ti45Al8Nb合金的耐腐蚀性能。 LSP过程中纳米晶、纳米孪晶和残余压应力的形成有利于形成致密的氧化膜，从而提高沉积态Ti45Al8Nb合金的耐腐蚀性能。