Clarifying the deformation modes and strengthening mechanisms of Mg-11Gd-5Y-2Zn-0.7Zr with outstanding high-temperature mechanical properties

被引：16

作者：

Zhou, Jianxin ^{[1
,2
]}

Yang, Hong ^{[1
,2
]}

Jiang, Bin ^{[1
,2
,3
,5
]}

He, Chao ^{[1
,2
]}

Dong, Zhihua ^{[1
,2
]}

Liu, Lintao ^{[1
,2
]}

Luo, Xiaojun ^{[1
,2
]}

Liu, Ying ^{[1
,2
]}

Huang, Dehui ^{[4
]}

Xu, Junyao ^{[1
,2
]}

Huang, Guangsheng ^{[1
,2
]}

Zhang, Dingfei ^{[1
,2
]}

Pan, Fusheng ^{[1
,2
,3
]}

机构：

[1] Chongqing Univ, Natl Engn Res Ctr Magnesium Alloys, Chongqing 400044, Peoples R China

[2] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China

[3] Chongqing Inst Adv Light Met, Chongqing 400030, Peoples R China

[4] Chongqing Changan New Energy Automobile Technol Co, Chongqing, Peoples R China

[5] Sha Zheng St 174, Chongqing, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2023年 / 866卷

基金：

中国国家自然科学基金;

关键词：

Mg alloys; High temperature; Mechanical properties; Microstructure; Deformation mode; STACKING ORDERED STRUCTURES; MAGNESIUM ALLOY; MG ALLOYS; ZR ALLOY; GD; MICROSTRUCTURE; 14H; PRECIPITATION; EXTRUSION; BEHAVIOR;

D O I：

10.1016/j.msea.2023.144638

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The mechanical properties of as-extruded Mg-11Gd-5Y-2Zn-0.7Zr (GWZ1152) alloy were systematically studied with respect to their microstructures at room and high temperatures. It exhibited excellent ultimate tensile strength (UTS) of 365 MPa at room temperature (RT), while it maintained relatively high UTS as the temperatures increased to 250 degrees C (342 MPa), 300 degrees C (337 MPa) and 350 degrees C (278 MPa) with a strain rate of 1.85 x 10-3 s- 1. The microstructural characterizations revealed that such outstanding heat resistance is mainly attributed to (i) the fine dynamic recrystallized (DRXed) grains and strongly textured un-DRXed grains, (ii) the block-shaped LPSO phase and the nano-scale beta precipitates, (iii) the nano-spaced basal LPSO/SFs. Compared to other heatresistant Mg alloys, our intrinsic chemistry properties contribute to the superior high-temperature mechanical properties of GWZ1152 alloy. For the deformation modes at RT, the dislocations were mainly generated and accumulated on the block-shaped LPSO, followed by cracking and propagation. At 250 degrees C and 300 degrees C, non-basal slip inside the coarse un-DRXed was generated, the cracks and fractures were initiated along the slip trace. The main deformation mechanism of GWZ1152 alloy at 350 degrees C was grain boundary sliding, cracks usually occurred at grain boundaries.

引用

页数：13

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