Microstructure and Mechanical Properties of Mg-9Li-1Zn Alloy with RE Elements Multi-micro Alloying

Wang Hongliang; Xie Shengzhong; Lin Jianguo

doi:10.15980/j.tzzz.2021.03.018

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Microstructure and Mechanical Properties of Mg-9Li-1Zn Alloy with RE Elements Multi-micro Alloying
Vol. 41, Issue 3, Pages: 344-348(2021)
Published： 2021 ，
DOI： 10.15980/j.tzzz.2021.03.018

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[1]王红亮,谢圣中,林建国.稀土微合金化对Mg-9Li-1Zn合金组织性能的影响[J].特种铸造及有色合金,2021,41(03):344-348.

Wang Hongliang, Xie Shengzhong, Lin Jianguo. Microstructure and Mechanical Properties of Mg-9Li-1Zn Alloy with RE Elements Multi-micro Alloying. [J]. Special Casting & Nonferrous Alloys 41(3):344-348(2021)
[1]王红亮,谢圣中,林建国.稀土微合金化对Mg-9Li-1Zn合金组织性能的影响[J].特种铸造及有色合金,2021,41(03):344-348. DOI： 10.15980/j.tzzz.2021.03.018.

Wang Hongliang, Xie Shengzhong, Lin Jianguo. Microstructure and Mechanical Properties of Mg-9Li-1Zn Alloy with RE Elements Multi-micro Alloying. [J]. Special Casting & Nonferrous Alloys 41(3):344-348(2021) DOI： 10.15980/j.tzzz.2021.03.018.

摘要

通过复合添加0.2%的Y+0.1%的Nd+0.05%的Gd（质量分数

下同）制备了轻质高强Mg-9Li-1Zn-RE合金（LZ91-RE）

随后对其进行锻造和冷轧。采用OM、SEM、EDS、XRD、TEM对锻造态和冷轧态LZ91合金和LZ91-RE合金进行组织及物相分析

同时利用拉伸试验机进行力学性能测试。结果表明

LZ91合金组织由α-Mg和β-Li两相组成

添加多元稀土元素后LZ91合金中α相体积分数减少了26.5%

晶粒得到显著细化

同时原位析出了富Y、富Nd、Mg

Nd及Mg

RE稀土强化相

但存在局部偏聚现象;LZ91-RE合金经过大应变冷轧变形

稀土强化相被破碎细化且分布更加均匀。此外

与LZ91合金相比

锻造态的LZ91-RE合金抗拉强度比LZ91合金提高了13.9%。冷轧态的LZ91-RE合金的抗拉强度比LZ91合金提高了19%

而伸长率只下降了4.4%。

Abstract

The multiple trace rare earth elements RE（0.2%Y+0.1%Nd+0.05%Gd）（mass percentage）were added to prepare light and high-strength Mg-9Li-1Zn-RE alloy（LZ91-RE）

which was subsequently forged and cold rolled.The microstructure and phase of the as-forged and as-rolled LZ91 alloy and LZ91-RE alloy were analyzed by means of OM

SEM

EDS

XRD

TEM.Meanwhile

the mechanical properties of the alloy prepared were tested by the tensile testing machine.The results reveal that the microstructure of LZ91 alloy consists of two phases ofα-Mg andβ-Li.After the addition of multiple rare earth elements

the volume fraction ofαphase in LZ91 alloy is reduced by 26.5%

and the grains are significantly refined.Y-rich

Nd-rich

Nd and Mg

RE rare earth strengthening phases are in-situ precipitated

however there exists a local segregation.After deformation of the LZ91-RE alloy by cold rolling with large strain

the rare earth strengthening phases in the alloy are broken and refined with more uniform distribution.In addition

compared with that of the LZ91 alloy

the tensile strength of the as-forged LZ91-RE alloy is increased by 13.9%.The tensile strength of the cold-rolled LZ91-RE alloy is increased by 19%

while the elongation is only reduced by 4.44%.