Grain refinement and β phase dispersion of AZ91D magnesium alloy by accumulative back extrusion: microstructure and mechanical properties

被引：0

作者：

Chen, Chen ^{[1
,4
]}

Xu, Yan ^{[2
]}

Zhang, Hongyun ^{[1
]}

Zhang, Min ^{[1
]}

Jia, Jianbo ^{[2
]}

Li, Jingwei ^{[3
]}

Chen, Shoudong ^{[1
]}

Wang, Fan ^{[1
,4
]}

机构：

[1] Tongling Univ, Sch Mech Engn, New Copper Based Mat Ind Gener Technol Res Ctr Anh, Tongling 244061, Peoples R China

[2] Yanshan Univ, Sch Mech Engn, Qinhuangdao 066004, Peoples R China

[3] Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Peoples R China

[4] Chizhou Univ, Sch Mat & Environm Engn, Anhui Engn Res Ctr Highly React Micronano Powders, Chizhou 247000, Peoples R China

来源：

JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2025年 / 37卷

关键词：

Accumulative back extrusion; Magnesium alloy; Mg; 17; Al; 12; phase; Grain refinement; Mechanical properties; MG ALLOY; DYNAMIC RECRYSTALLIZATION; TEXTURE EVOLUTION; BEHAVIOR; DEFORMATION; HOMOGENEITY;

D O I：

10.1016/j.jmrt.2025.07.112

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this study, the effect of accumulative back extrusion (ABE) on the microstructure and tensile properties of AZ91D alloy was investigated under different conditions. The results reveal that the deformation temperature and solid solution time exerted significant influences on the microstructure. In a 24h sample (solution treatment), the average grain size of the 280 degrees C/3 passes sample was refined to 2.93 mu m, which was associated with the deformation accumulation during the alternating loading process and the dispersion of the /I-Mg17Al12 phase. The coarse /I phase gradually transforms into continuous precipitation (CP) and discontinuous precipitation (DP) ways through solution treatment. Microstructure analysis reveals that the /I phases were mainly distributed along the grain boundaries, contributing to inhibiting the migration of grain boundaries. The plasticity of the AZ91D alloy was remarkably improved under the ABE process. In the 310 degrees C/3 passes sample, the ultimate tensile strength (UTS) of the AZ91D alloy reached 239.37 MPa, and the elongation was 24.35 %. Compared with the initial as-cast sample, its strength and elongation increased by 177.9 % and 324.7 %, respectively, attributed to the transformation of deformed AZ91D alloys from the typical brittle fracture to the ductile fracture mode. The significantly elevated grain boundaries in fine-grained magnesium alloys served to coordinate deformation. This work provides a new processing technology for the design of high-strength and high-ductility bulk materials of AZ91D alloy, as well as scientific guidance for the development of fine-grained magnesium alloy.

引用

页码：4176 / 4188

页数：13