Experimental and numerical investigation into rectangular tube extrusion of high-strength magnesium alloy

被引：6

作者：

Bai S. ^{[1
]}

Fang G. ^{[1
]}

机构：

[1] State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing

来源：

International Journal of Lightweight Materials and Manufacture | 2020年 / 3卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Finite element simulation; Magnesium alloy; Mechanical properties; Tube extrusion;

D O I：

10.1016/j.ijlmm.2019.11.001

中图分类号：

学科分类号：

摘要：

In order to reduce weight in air and ground vehicles, hollow magnesium alloy profiles are widely concerned. This research was aimed to extrude the tubes of newly developed high-strength alloy Mg–Al–Zn-RE by the porthole die. The magnesium alloy tubes with rectangular sections were extruded at the conditions optimized through the finite element simulations of extrusion processes. The microstructure observation indicated that the magnesium alloy underwent complete dynamic recrystallization (DRX) during the hot extrusion. Moreover, plenty of fine particles dynamically precipitated from the magnesium matrix were distributed on the grain boundaries. Undergoing the dramatical evolution of microstructure, the fine grains and particles significantly strengthened the extruded magnesium alloy. The tensile test demonstrated that extruded tubes possessed maximum ultimate tensile strength 406 ± 7 MPa and elongation 21.8 ± 1.0% at the optimal extrusion parameters. © 2020 The Authors

引用

页码：136 / 143

页数：7

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