Effect of Sn content on microstructure and tensile properties of as-cast and as-extruded Mg-8Li-3A1-(1,2,3)Sn alloys

被引：40

作者：

Chen, Xiao-yang ^{[1
]}

Zhang, Yang ^{[1
]}

Cong, Meng-qi ^{[1
]}

Lu, Ya-lin ^{[1
]}

Li, Xiao-ping ^{[1
]}

机构：

[1] Jiangsu Univ Technol, Key Lab Adv Mat Design & Addit Mfg Jiangsu Prov, Changzhou 213001, Peoples R China

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2020年 / 30卷 / 08期

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

Mg-Li-Al-Sn alloy; as-cast state; recrystallization; microstructure; tensile properties; MECHANICAL-PROPERTIES; DEFORMATION-BEHAVIOR; CORROSION BEHAVIOR; RECENT PROGRESS; EXTRUSION; PHASE; PARAMETERS; EVOLUTION; HARDNESS; TEXTURE;

D O I：

10.1016/S1003-6326(20)65362-6

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The effects of Sn content on microstructure and tensile properties of as-cast and as-extruded Mg-8Li-3Al-(1,2,3)Sn (wt.%) alloys were investigated by X-ray diffractometry (XRD), optical microscopy (OM), scanning electron microscopy (SEM) and tensile test. It is found that, as-cast Mg-8Li-3Al-(1,2,3)Sn alloys consist of alpha-Mg+beta-Li duplex matrix, MgLiAl2 and Li2MgSn phases. Increasing Sn content leads to grain refinement of alpha-Mg dendrites and increase in content of Li2MgSn phase. During hot extrusion, complete dynamic recrystallization (DRX) takes place in beta-Li phase while incomplete DRX takes place in alpha-Mg phase. As Sn content is increased, the volume fraction of DRXed alpha-Mg grains is increased and the average grain size of DRXed alpha-Mg grains is decreased. Increasing Sn content is beneficial to strength but harmful to ductility for as-cast Mg-8Li-3Al-(1,2,3)Sn alloys. Tensile properties of Mg-8Li-3Al-(1,2,3)Sn alloys are improved significantly via hot extrusion and Mg-8Li-3Al-2Sn alloy exhibits the best tensile properties.

引用

页码：2079 / 2089

页数：11

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