Effects of deep cryogenic treatment on microstructure, mechanical, and corrosion of ZK60 Mg alloy

• DOI: 10.1016/j.jmrt.2023.08.158
• Publication Date: 2023-08-19T07:58:52Z
• Authors: Jiaqi Hu; Guixu Yang; Zheng Liu; Sichao Fu; Hong Gao
• Keywords: Cryogenic Treatment; Galvanic corrosion; Galvanic cell; Elongation

This study aims to investigate the effects of deep cryogenic treatment combined with traditional heat on microstructural characteristics, mechanical properties, and corrosion performance ZK60 magnesium alloy. Quasi-in-situ TEM testing also indicates that induces formation ultra-fine zinc-rich precipitates in matrix. After solid solution treatment, materials will retain significant internal stress, which promotes subsequent precipitation rod-like β'1 during aging. Microstructural analysis reveals before artificial aging can significantly enhance length density precipitates. The treated material shows improved strength while maintaining its original elongation rate. Due nanoscale precipitation-induced micro galvanic effect, aged samples exhibit a higher abundance micrometer-sized second phases untreated sample does not accelerate material's solution-treated show weakest effect best resistance.