Microstructures and Mechanical Properties of As-cast and Extruded Mg-11Li-3Al-xZr Alloy

Liu Xuhe; Xie Haitao; Liu Yang; Xiao Yang

doi:10.15980/j.tzzz.2017.08.002

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Microstructures and Mechanical Properties of As-cast and Extruded Mg-11Li-3Al-xZr Alloy
Vol. 37, Issue 8, Pages: 816-820(2017)
Published： 2017 ，
DOI： 10.15980/j.tzzz.2017.08.002

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[1]刘旭贺,解海涛,刘洋,肖阳.铸态及挤压态Mg-11Li-3Al-xZr合金的组织及性能[J].特种铸造及有色合金,2017,37(08):816-820.

Liu Xuhe, Xie Haitao, Liu Yang, et al. Microstructures and Mechanical Properties of As-cast and Extruded Mg-11Li-3Al-xZr Alloy. [J]. Special Casting & Nonferrous Alloys 37(8):816-820(2017)
[1]刘旭贺,解海涛,刘洋,肖阳.铸态及挤压态Mg-11Li-3Al-xZr合金的组织及性能[J].特种铸造及有色合金,2017,37(08):816-820. DOI： 10.15980/j.tzzz.2017.08.002.

Liu Xuhe, Xie Haitao, Liu Yang, et al. Microstructures and Mechanical Properties of As-cast and Extruded Mg-11Li-3Al-xZr Alloy. [J]. Special Casting & Nonferrous Alloys 37(8):816-820(2017) DOI： 10.15980/j.tzzz.2017.08.002.

摘要

通过真空感应熔炼及挤压变形制备了铸态及挤压态的Mg-11Li-3Al-xZr（x=0、0.1）合金

采用OM、XRD、SEM、EDS观察并分析了合金的显微组织

测试了不同状态合金的力学性能。结果表明

Mg-11Li-3Al-xZr合金均含有β-Li、α-Mg、θ-MgLi

Al、AlLi相

Mg-11Li-3Al-0.1Zr合金中还存在Al

Zr相。铸态合金晶粒粗大

挤压变形过程中发生动态再结晶使晶粒细化。Zr的添加能明显细化晶粒

尤其在挤压后Mg-11Li-3Al-0.1Zr合金晶粒尺寸仅为Mg-11Li-3Al合金的1/4左右。铸态时两种合金力学性能相近

Mg-11Li-3Al-0.1Zr合金伸长率略低;挤压变形后两种合金伸长率较高

而且由于加工硬化和细晶强化作用

强度明显提高

Mg-11Li-3Al-0.1Zr合金的强度达到194 MPa

较铸态提高32.8%。

Abstract

Mg-11Li-3Al-xZr（x=0

0.1）alloys were prepared by vacuum induction melting and extrusion

and microstructure of the as-cast and as-extruded alloys was observed and analyzed by OM

XRD

SEM and EDS

meanwhile

mechanical properties of the alloys were tested by tensile testing.The results indicate that the Mg-11Li-3Al-xZr（x=0

0.1）alloys consist ofβ-Li

α-Mg

θ-MgLi

Al and AlLi phase.In addition

Zr phase exists in Mg-11Li-3Al-0.1Zr alloy.The grain size of the as-cast alloy exhibits coarse

while dynamic recrystallization occurs during the extrusion deformation.The addition of Zr can refine grain size obviously

where the grain size of Mg-11Li-3Al-0.1Zr alloy is only about 1/4of Mg-11Li-3Al alloy after extrusion.Mechanical properties of the two as-cast alloys are similar

while the elongation of Mg-11Li-3Al-0.1Zr is lower than that of the Mg-11Li-3Al alloy.After extrusion

the two alloys still have the high elongation

and the strength is increased obviously due to working hardening and fine grain strengthening effect.The strength of the Mg-11Li-3Al-0.1Zr alloy reaches 194 MPa

which is increased by 32.8% compared with that of the cast alloy.