通过高速挤压开发新型低合金化高强塑Mg–RE合金

谢金书; 张志; 刘淑娟; 张景怀; 王军; 何玉莹; 卢立伟; 焦云雷; 巫瑞智

doi:10.1007/s12613-022-2472-x

Volume 30 Issue 1

Jan. 2023

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文章导航 > 矿物冶金与材料学报（英文） > 2023 > 30(1): 82-91

Jinshu Xie, Zhi Zhang, Shujuan Liu, Jinghuai Zhang, Jun Wang, Yuying He, Liwei Lu, Yunlei Jiao, and Ruizhi Wu, Designing new low alloyed Mg–RE alloys with high strength and ductility via high-speed extrusion, Int. J. Miner. Metall. Mater., 30(2023), No. 1, pp. 82-91. https://doi.org/10.1007/s12613-022-2472-x

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Jinshu Xie, Zhi Zhang, Shujuan Liu, Jinghuai Zhang, Jun Wang, Yuying He, Liwei Lu, Yunlei Jiao, and Ruizhi Wu, Designing new low alloyed Mg–RE alloys with high strength and ductility via high-speed extrusion, Int. J. Miner. Metall. Mater., 30(2023), No. 1, pp. 82-91. https://doi.org/10.1007/s12613-022-2472-x

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研究论文

通过高速挤压开发新型低合金化高强塑Mg–RE合金

1)
哈尔滨工程大学材料科学与化学工程学院，超轻材料与表面技术教育部重点实验室，哈尔滨 150001, 中国
2)
哈尔滨工业大学材料科学与工程学院，哈尔滨 150001，中国
3)
中国兵器科学研究院宁波分院，宁波 315103，中国
4)
湖南科技大学材料科学与工程学院，湘潭 411201，中国

通讯作者:
张景怀    E-mail: zhangjinghuai@hrbeu.edu.cn

王军    E-mail: nafion412@163.com

卢立伟    E-mail: cqullw@163.com

文章亮点

(1) 新型低合金化Mg–RE合金可在相对高的挤压速度下大规模生产。

(2) 新型低合金化Mg–RE的室温力学性能明显高于AZ31合金。

(3) 新型合金具有良好的高温强度，远高于AZ31合金。

中文摘要

镁合金绝对强度强度低、室温塑性差，耐热性差等问题严重影响了其进一步广泛应用。在现今国家“碳达峰、碳中和”战略下，大力开发轻质低合金化镁合金大势所趋。在本工作中，开发了两种新的低合金化Mg–2RE–0.8Mn–0.6Ca–0.5Zn (wt%，RE = Sm或Y)合金，可通过相对高速挤压在工业规模上生产。这两种合金不仅在可挤压性方面与商业AZ31合金相当，而且具有优异的机械性能，特别是在屈服强度(YS)方面。优异的可挤压性与两种铸态合金的较粗的第二相颗粒和较高的初始熔点有关。高强度–韧性主要来自细晶粒、纳米间距亚微米/纳米沉淀和弱织构的形成。此外，值得注意的是，两种合金的YS在250°C的高温下可保持在160 MPa以上，显著高于AZ31合金(YS: 45 MPa)。晶界处的Zn/Ca溶质偏析、RE固溶以及高熔点的强化颗粒(Mn, MgZn₂, Mg–Zn–RE/Mg–Zn–RE–Ca) 是镁合金获得优异高温强度的主要原因。

关键词:

Research Article

Designing new low alloyed Mg–RE alloys with high strength and ductility via high-speed extrusion

+ Author Affiliations

1)
Key Laboratory of Superlight Material and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
2)
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
3)
Ningbo Branch, Ordnance Science Institute of China, Ningbo 315103, China
4)
School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan 411201, China

Corresponding authors:
Jinghuai Zhang    E-mail: zhangjinghuai@hrbeu.edu.cn

Jun Wang    E-mail: nafion412@163.com

Liwei Lu    E-mail: cqullw@163.com
Received: 18 February 2022; Revised: 4 March 2022; Accepted: 10 March 2022; Available online: 11 March 2022

Abstract

Abstract

Two new low-alloyed Mg–2RE–0.8Mn–0.6Ca–0.5Zn (wt%, RE = Sm or Y) alloys are developed, which can be produced on an industrial scale via relatively high-speed extrusion. These two alloys are not only comparable to commercial AZ31 alloy in extrudability, but also have superior mechanical properties, especially in terms of yield strength (YS). The excellent extrudability is related to less coarse second-phase particles and high initial melting point of the two as-cast alloys. The high strength–ductility mainly comes from the formation of fine grains, nano-spaced submicron/nano precipitates, and weak texture. Moreover, it is worth noting that the YS of the two alloys can maintain above 160 MPa at elevated temperature of 250°C, significantly higher than that of AZ31 alloy (YS: 45 MPa). The Zn/Ca solute segregation at grain boundaries, the improved heat resistance of matrix due to addition of RE, and the high melting points of strengthening particles (Mn, MgZn₂, and Mg–Zn–RE/Mg–Zn–RE–Ca) are mainly responsible for the excellent high-temperature strength.
- magnesium alloys;
- high-speed extrusion;
- high strength;
- high ductility;
- solute segregation

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