This study systematically investigated the hot compression behavior and microstructure evolution of the Mg-9Li-3Al-3Zn (LAZ933) alloy using a series of hot compression experiments. The Arrhenius constitutive equation and hot processing map were established and evaluated for the LAZ933 alloy. The hot compression experiment was conducted at a deformation temperature and strain rate of 160-320 °C and 0.001-5 s-1. The results indicate that the LAZ933 alloy’s true stress-strain curve illustrates dynamic recovery characteristics, and the flow behavior of LAZ933 alloy during hot compression is generally similar in overall trend. The Arrhenius constitutive model established by calculation and fitting can accurately predict the hot deformation behavior of LAZ933 alloy, and the hot working process parameter range with deformation temperature of 270 ~ 320 °C and strain rate of 0.001 ~ 0.1 s-1 was obtained through the hot processing map. The microstructure evolution of LAZ933 alloy was analyzed by combining <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11665_2025_10872_Article_IEq1.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="16" /> </InlineMediaObject> <EquationSource Format="TEX">$Z$</EquationSource> <EquationSource Format="MATHML"><math> <mi>Z</mi> </math></EquationSource> </InlineEquation> parameters. With an increase in the strain rate, the grain size of the LAZ933 alloy first decreases and then increases. The reason for grain growth is that as the strain rate further increases, the heat generated by hot deformation within the grain is not efficiently released quickly, resulting in a local temperature increase. The acquisition of an ideal defect-free microstructure requires reasonable control of the alloy’s <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11665_2025_10872_Article_IEq1.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="16" /> </InlineMediaObject> <EquationSource Format="TEX">$Z$</EquationSource> <EquationSource Format="MATHML"><math> <mi>Z</mi> </math></EquationSource> </InlineEquation> parameters.

Hot Compression Deformation Behavior and Microstructure Evolution of Homogenized Mg-9Li-3Al-3Zn Alloy

期刊论文
发表日期：

2025年2月25日

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Jian Xu,
Mengxian Zhang,
Bin Liu,
Yong Xue

摘要

This study systematically investigated the hot compression behavior and microstructure evolution of the Mg-9Li-3Al-3Zn (LAZ933) alloy using a series of hot compression experiments. The Arrhenius constitutive equation and hot processing map were established and evaluated for the LAZ933 alloy. The hot compression experiment was conducted at a deformation temperature and strain rate of 160-320 °C and 0.001-5 s^-1. The results indicate that the LAZ933 alloy’s true stress-strain curve illustrates dynamic recovery characteristics, and the flow behavior of LAZ933 alloy during hot compression is generally similar in overall trend. The Arrhenius constitutive model established by calculation and fitting can accurately predict the hot deformation behavior of LAZ933 alloy, and the hot working process parameter range with deformation temperature of 270 ~ 320 °C and strain rate of 0.001 ~ 0.1 s^-1 was obtained through the hot processing map. The microstructure evolution of LAZ933 alloy was analyzed by combining $Z$ $Z$ parameters. With an increase in the strain rate, the grain size of the LAZ933 alloy first decreases and then increases. The reason for grain growth is that as the strain rate further increases, the heat generated by hot deformation within the grain is not efficiently released quickly, resulting in a local temperature increase. The acquisition of an ideal defect-free microstructure requires reasonable control of the alloy’s $Z$ $Z$ parameters.