挤压对Mg-5Li-5Al-0.6Y合金组织、力学性能和腐蚀行为的影响

doi:10.13251/j.issn.0254-6051.2021.08.017

金属热处理 ›› 2021, Vol. 46 ›› Issue (8): 85-91.DOI: 10.13251/j.issn.0254-6051.2021.08.017

挤压对Mg-5Li-5Al-0.6Y合金组织、力学性能和腐蚀行为的影响

叶佳钰, 冯艳, 贺玉卿, 杨柳忠

中南大学材料科学与工程学院, 湖南长沙 410083

收稿日期:2021-04-04 出版日期:2021-08-25 发布日期:2021-12-09
通讯作者: 冯艳,教授,E-mail:fengyanmse@csu.edu.cn
作者简介:叶佳钰(1994—),女,硕士研究生,主要研究方向为镁合金材料,E-mail:515073313@qq.com。
基金资助:
湖南省高新技术产业科技创新引领计划(2020GK2044)

Effect of extrusion on microstructure, mechanical properties and corrosion behavior of Mg-5Li-5Al-0.6Y alloy

Ye Jiayu, Feng Yan, He Yuqing, Yang Liuzhong

School of Materials Science and Engineering, Central South University, Changsha Hunan 410083, China

Received:2021-04-04 Online:2021-08-25 Published:2021-12-09

摘要/Abstract

摘要： 对铸态Mg-5Li-5Al-0.6Y合金进行了热挤压,采用光学显微镜(OM)、扫描电镜(SEM)和X射线衍射仪(XRD)研究了挤压对铸态合金物相和微观组织的影响。通过对挤压前后的合金进行室温拉伸试验和断口形貌分析,研究了挤压对合金力学性能的影响。通过析氢、质量减少、动电位极化曲线和电化学阻抗分析了挤压对合金腐蚀行为的影响。结果表明,挤压细化了Mg-5Li-5Al-0.6Y合金的晶粒,第二相沿挤压方向破碎成更细小弥散的颗粒,使合金的室温抗拉强度和伸长率分别提高至243.33 MPa和7.31%,合金的腐蚀速率(由质量减少计算得到)从17.60 mm·y^-1降低至8.41 mm·y^-1,提高了合金的耐腐蚀性能。

关键词: Mg-5Li-5Al-0.6Y合金, 挤压, 显微组织, 力学性能, 腐蚀行为

Abstract: Mg-5Li-5Al-0.6Y alloy was prepared by casting and hot extrusion. Effect of extrusion on phase and microstructure of the as-cast alloy was studied by means of optical microscopy, scanning electron microscopy and X-ray diffractometer. Effect of extrusion on mechanical properties of the alloy was studied via tensile testing at room temperature and fracture morphology analysis before and after extrusoin. Effect of extrusion on corrosion behavior of the alloy was analyzed by means of hydrogen evolution, mass loss, potentiodynamic polarization curve and electrochemical impedance spectroscopy (EIS). The results indicate that extrusion refines the grain of the Mg-5Li-5Al-0.6Y alloy and the second phases are broken into finer and dispersed particles along the extrusion direction in the α-Mg matrix. Extrusion improves the ultimate tensile strength and elongation of the Mg-5Li-5Al-0.6Y alloy to 243.33 MPa and 7.31%, respectively. Extrusion declines the corrosion rate (calculated from mass loss) of the Mg-5Li-5Al-0.6Y alloy from 17.60 mm·y^-1 to 8.41 mm·y^-1, improving the corrosion resistance of the alloy.

Key words: Mg-5Li-5Al-0.6Y alloy, extrusion, microstructure, mechanical properties, corrosion behavior

中图分类号:

TG146.2⁺2

叶佳钰, 冯艳, 贺玉卿, 杨柳忠. 挤压对Mg-5Li-5Al-0.6Y合金组织、力学性能和腐蚀行为的影响[J]. 金属热处理, 2021, 46(8): 85-91.

Ye Jiayu, Feng Yan, He Yuqing, Yang Liuzhong. Effect of extrusion on microstructure, mechanical properties and corrosion behavior of Mg-5Li-5Al-0.6Y alloy[J]. Heat Treatment of Metals, 2021, 46(8): 85-91.

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挤压对Mg-5Li-5Al-0.6Y合金组织、力学性能和腐蚀行为的影响

Effect of extrusion on microstructure, mechanical properties and corrosion behavior of Mg-5Li-5Al-0.6Y alloy

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