Effects of Solution and Aging Treatment on Microstructure and Properties of As-extruded Mg-10Li-3Al-1Zn-0.3Mn Alloy

Liu Xuhe; Liu Xidong; Shao Fengxiang; Sun Mengmeng

doi:10.15980/j.tzzz.2020.07.003

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Effects of Solution and Aging Treatment on Microstructure and Properties of As-extruded Mg-10Li-3Al-1Zn-0.3Mn Alloy
Vol. 40, Issue 7, Pages: 710-713(2020)
Published： 2020 ，
DOI： 10.15980/j.tzzz.2020.07.003

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[1]刘旭贺,刘希东,邵凤翔,孙盟盟.固溶及时效对挤压态Mg-10Li-3Al-1Zn-0.3Mn合金组织及性能的影响[J].特种铸造及有色合金,2020,40(07):710-713.

Liu Xuhe, Liu Xidong, Shao Fengxiang, et al. Effects of Solution and Aging Treatment on Microstructure and Properties of As-extruded Mg-10Li-3Al-1Zn-0.3Mn Alloy. [J]. Special Casting & Nonferrous Alloys 40(7):710-713(2020)
[1]刘旭贺,刘希东,邵凤翔,孙盟盟.固溶及时效对挤压态Mg-10Li-3Al-1Zn-0.3Mn合金组织及性能的影响[J].特种铸造及有色合金,2020,40(07):710-713. DOI： 10.15980/j.tzzz.2020.07.003.

Liu Xuhe, Liu Xidong, Shao Fengxiang, et al. Effects of Solution and Aging Treatment on Microstructure and Properties of As-extruded Mg-10Li-3Al-1Zn-0.3Mn Alloy. [J]. Special Casting & Nonferrous Alloys 40(7):710-713(2020) DOI： 10.15980/j.tzzz.2020.07.003.

摘要

对挤压态Mg-10Li-3AL-1Zn-0.3Mn合金进行了不同温度的固溶和时效处理

通过OM、XRD以及硬度测试

分析了合金的显微组织及力学性能的变化。结果表明

挤压态合金组织由α-Mg相、β-Li相以及MgLiAl

相组成

α-Mg相呈大小不等的块状分布在合金中

硬度较低（46.8HV）。在不同温度下分别固溶30min后

均发生α相固溶。随着固溶温度升高

α相的固溶程度增大

合金的硬度逐渐提高

在460℃固溶后合金硬度（HV）最高为110

与挤压态合金相比提高了135%;在460℃分别固溶30、60和90min

发现随着固溶时间增加

硬度下降。时效后合金硬度降低

在70℃时效1h和人工时效20天后

硬度（HV）最终均稳定在75左右

较挤压态提高约60%。

Abstract

An as-extruded Mg-10Li-3Al-1Zn-0.3Mn alloy was treated by solution and aging at different temperatures.The microstructure and mechanical properties of the alloy were analyzed by OM

XRD and hardness testing.The results show that the as-extruded alloy is composed ofα-Mg

β-Li and MgLiAl

phase.α-Mg phase is distributed in the alloy in blocks of different sizes with low hardness（46.8 HV）.The hardness of the alloy is increased gradually with the increase of solution temperature.α-Mg phase is dissolved into the matrix alloy with solid solution at different temperatures for 30 min

and the hardness of the alloy is increased with increasing of solution temperature which result in the increase ofα-Mg phase solution.The hardness of the alloy reaches up to 110 HV after solution at 460℃ for 30 min

which is 135% higher than that of extruded alloy.The hardness of the alloy is decreased with the increase of solution time at 460℃ for 30

60 and 90 min.After artificial aging and natural aging

the hardness of the alloy is decreased.After aging at 70℃ for 1 hour or artificial aging for 20 days

the hardness of the alloy is finally stabilized at about 75 HV

which is about 60%higher than that of the extruded alloy.