Improving the mechanical and corrosion properties of pure magnesium by parts-per-million-level alloying
Improving the mechanical and corrosion properties of pure magnesium by parts-per-million-level alloying
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通过百万分之一级合金化提高纯镁的机械和腐蚀性能
DOI：
10.1016/j.actamat.2022.118393
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发表时间：
2022
期刊：
影响因子：
9.4
通讯作者：
Chino Yasumasa
中科院分区：
文献类型：
--
作者：
Bian Mingzhe;Nakatsugawa Isao;Matsuoka Yusuke;Huang Xinsheng;Tsukada Yuhki;Koyama Toshiyuki;Chino Yasumasa
冷成形性差、耐腐蚀性差和合金元素的高成本是最轻的结构金属即镁（Mg）广泛使用的长期障碍。在这里，我们报告说，室温（RT）的拉伸成形性和耐腐蚀性的商业使用的纯镁可以显着提高通过添加微量的铜（Cu）和钙（Ca）。通过杯突法和拉伸试验对材料的力学性能进行了表征，通过盐水浸泡法对材料的腐蚀性能进行了评价。RT拉伸成形性的显着增强与弱化的基底织构和细化的显微组织相关，而耐腐蚀性的大幅改善与主要由Ca添加和形成富含Cu和Ca的保护性表面膜引起的强Fe去除能力有关。由于微量的合金元素，所得合金还显示出优异的导热率，其比最常用的Mg合金（AZ 31：Mg-3Al-1 Zn，以重量%计）的导热率高几乎两倍。这些发现有望刺激可用于便携式电子设备、汽车电子和家用电器的高性能镁合金的开发。
Poor cold formability, poor corrosion resistance, and high cost of alloying elements are longstanding barriers to the widespread use of the lightest structural metal, viz. magnesium (Mg). Here, we report that both the room-temperature (RT) stretch formability and corrosion resistance of the commercially used pure Mg could be significantly improved by adding trace amounts of copper (Cu) and calcium (Ca). The mechanical properties were characterized by Erichsen cupping and tensile tests, while the corrosion properties were evaluated by immersion in saline solution. The significant enhancement in the RT stretch formability is associated with the weakened basal texture and refined microstructure, whereas the substantial improvement in the corrosion resistance is related to the strong Fe-removal ability induced mainly by Ca addition and formation of a protective surface film enriched with Cu and Ca. Owing to the trace amounts of the alloying elements, the resultant alloy also showed excellent thermal conductivity, which was almost two times higher than that of the most commonly used Mg alloy (AZ31: Mg–3Al–1Zn in wt.%). These findings are expected to stimulate the development of high-performance Mg alloys that can be used in portable electronic devices, automobile electronics, and household appliances.