High strength BCC magnesium-Lithium alloy processed by cryogenic rolling and room temperature rolling and its strengthening mechanisms

被引：24
|
作者：
Ji, Qing [1 ]
Zhang, Shun [1 ]
Wu, Ruizhi [1 ,2 ]
Jin, Siyuan [1 ]
Zhang, Jinghuai [1 ]
Hou, Legan [1 ]
机构：
[1] Harbin Engn Univ, Minist Educ, Key Lab Superlight Mat & Surface Technol, Harbin 150001, Peoples R China
[2] Heihe Univ, Coll Sci, Heihe 164300, Heilongjiang, Peoples R China
来源：
MATERIALS CHARACTERIZATION | 2022年 / 187卷
基金：
中国国家自然科学基金; 中央高校基本科研业务费专项资金资助;
关键词：
Mg-Li-Zn-Er alloy; BCC-structured; Cryogenic-rolling; Grain refinement strengthening; Dislocation strengthening; DYNAMIC RECRYSTALLIZATION; AB-INITIO; MG; MICROSTRUCTURE; INTERFACES; PLUS; ZN;
D O I：
10.1016/j.matchar.2022.111869
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Based on high Li content, optimizing the mechanical properties of Mg-Li alloy can bring about the good com-bination of ultra-low density and high strength, causing high specific strength. Reducing the deformation tem-perature can effectively maintain the strength improvement of deformed beta-based Mg-Li alloy. In this work, the microstructures and mechanical properties of room-rolled (RR) and cryogenic-rolled (CR) Mg-16Li-4Zn-1Er (LZE1641) alloy were investigated. Results show that cryogenic temperature delays the dynamic recovery (DRV) and dynamic recrystallization(DRX). A tensile strength of 267 MPa can be obtained at CR60%, which is attributed to the nanocrystalline grains and the significantly higher dislocation density than that of the RR alloy. Further CR with 80% reduction makes the form of some alloying elements transform from solid state to pre-cipitation phases, causing relatively decreased strength
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页数：12
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