Influence of Ca and Mn Microalloying on Microstructure and Mechanical Properties of Mg-14Li-3Al-0.5Y Alloy

Liu Wencai; Sun Jiawei; Zhang Quanda; Gao Zhankui; Wu Guohua; Ding Wenjiang

doi:10.15980/j.tzzz.2021.07.003

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Influence of Ca and Mn Microalloying on Microstructure and Mechanical Properties of Mg-14Li-3Al-0.5Y Alloy
Vol. 41, Issue 7, Pages: 808-813(2021)
Published： 2021 ，
DOI： 10.15980/j.tzzz.2021.07.003

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Liu Wencai, Sun Jiawei, Zhang Quanda, et al. Influence of Ca and Mn Microalloying on Microstructure and Mechanical Properties of Mg-14Li-3Al-0.5Y Alloy. [J]. Special Casting & Nonferrous Alloys 41(7):808-813(2021)
DOI：

Liu Wencai, Sun Jiawei, Zhang Quanda, et al. Influence of Ca and Mn Microalloying on Microstructure and Mechanical Properties of Mg-14Li-3Al-0.5Y Alloy. [J]. Special Casting & Nonferrous Alloys 41(7):808-813(2021) DOI： 10.15980/j.tzzz.2021.07.003.

摘要

通过在强度较高而塑性不足的Mg-14Li-3Al-0.5Y合金基础上分别添加微量Ca、Mn元素

以研究Ca和Mn微合金化对铸态合金微观组织和力学性能的影响。结果发现

添加微量Ca使合金中生成了分布于β-Li晶界的半连续网状Al

Ca相

消耗了具有固溶强化效果的Al元素

β-Li显著细化。微量Mn的加入使合金中生成了弥散分布于β-Li基体的含Mn相和Al

相

显著抑制了β-Li的长大。开发了具有超低密度（1.36 g/cm

）、高伸长率（11%）的新型Mg-14Li-3Al-0.5Y-0.2Mn合金

其屈服强度和抗拉强度分别达到144 MPa和175.5 MPa。

Abstract

The influence of Ca and Mn microalloying on microstructure and mechanical properties of Mg-14 Li-3 Al-0.5 Y alloy with high strength and low density was investigated. The results indicate that the addition of Ca leads to the formation of semi-continuous netlike Al

Ca phase distributed in the β-Li grain boundary in the alloy

which consumes the Al element with solid solution strengthening effect and significantly refines the β-Li. The addition of Mn can generate the Mn phase and Al

phase dispersed in the β-Li matrix in the alloy

which inhibits the growth of β-Li. The superlight Mg-14 Li-3 Al-0.5 Y-0.2 Mn alloy with ultra-low density（1.36 g/cm

） and high elongation（11%） was developed

of which the strength and tensile strength reach 144 MPa and 175.5 MPa

respectively.