Huang Xuefei, Han Guomin, Huang Weigang
College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China.
Institute of Applied Physics and Computational Mathematics, Beijing 100094, China.
Materials (Basel). 2018 Apr 19;11(4):628. doi: 10.3390/ma11040628.
The effects of T6 treatment (solid-solution and artificially aging at 200 °C) on the microstructure and corrosion properties of an Mg⁻4Sn⁻4Zn⁻2Al (TZA442) alloy were systematically investigated. The alloy exhibits a double-peak age-hardening behavior, i.e., one is 78 HV after 10 h of aging, and the other is 83 HV after 50 h of aging. The strengthening effect is mainly attributed to the simultaneously and mutually independent precipitation of the dispersively distributed MgZn₂ and Mg₂Sn precipitates. Solid-solution treatment can significantly decrease the corrosion rate of the TZA442 alloy. The following aging treatment can initially further decrease the corrosion rate in the under-aged state, but can afterward slightly increase it after 50 h of aging. The relationship between the microstructure and corrosion properties is also discussed.
系统研究了T6处理（固溶处理并在200°C人工时效）对Mg⁻4Sn⁻4Zn⁻2Al（TZA442）合金微观结构和腐蚀性能的影响。该合金呈现双峰时效硬化行为，即一次是时效10小时后硬度为78 HV，另一次是时效50小时后硬度为83 HV。强化效果主要归因于弥散分布的MgZn₂和Mg₂Sn析出相同时且相互独立地析出。固溶处理可显著降低TZA442合金的腐蚀速率。随后的时效处理最初可在欠时效状态下进一步降低腐蚀速率，但在时效50小时后会使其略有增加。还讨论了微观结构与腐蚀性能之间的关系。
