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

Experimental and numerical investigation into rectangular tube extrusion of high-strength magnesium alloy
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高强镁合金矩形管挤压实验及数值研究

DOI:
10.1016/j.ijlmm.2019.11.001
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发表时间:
2020-06
影响因子:
--
通讯作者:
Fang G.
Fang G.
中科院分区:
--
文献类型:
--
作者:
Bai S.;Fang G.

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为了减轻航空和地面车辆的重量,空心镁合金型材受到广泛关注。采用分流模挤压新开发的Mg-Al-Zn-RE高强合金管材。通过对挤压过程的有限元模拟,在优化的挤压工艺条件下挤压出镁合金矩形截面管材。显微组织观察表明,镁合金在热挤压过程中发生了完全动态再结晶。此外,大量细小的颗粒从镁基体中动态析出,分布在晶界上。挤压态镁合金的组织发生了剧烈的演变,细小的晶粒和颗粒显著强化了挤压态镁合金。拉伸试验表明,在最佳挤压工艺条件下,挤压管的最大抗拉强度为406 ± 7 MPa,伸长率为21.8 ± 1.0%。
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.
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