异步轧制Mg-3Zn-2(Ce/La)-1Mn合金的微观组织及织构演变

doi:10.13251/j.issn.0254-6051.2020.02.001

金属热处理 ›› 2020, Vol. 45 ›› Issue (2): 1-6.DOI: 10.13251/j.issn.0254-6051.2020.02.001

• 组织与性能 • 下一篇

异步轧制Mg-3Zn-2(Ce/La)-1Mn合金的微观组织及织构演变

宋旭东^1,2, 袁鸽成¹, 黎小辉², 奉隆彪^1,2

1. 广东工业大学材料与能源学院, 广东广州 510006;
2. 广东省材料与加工研究所, 广东广州 510650

收稿日期:2019-08-17 出版日期:2020-02-25 发布日期:2020-04-03
通讯作者: 袁鸽成,教授,联系电话:13660196782,E-mail:gchyuan@gdut.edu.cn
作者简介:宋旭东(1994—),男,硕士研究生,主要从事稀土镁合金的异步轧制变形机理的研究,E-mail:songxudong_gdut@163.com。
基金资助:
国家自然科学基金(51404079);广东省科技计划项目(2015A030313902,2014B010105009,2017A010103018)

Microstructure and texture evolution of differential speed rolled Mg-3Zn-2(Ce/La)-1Mn alloy

Song Xudong^1,2, Yuan Gecheng¹, Li Xiaohui², Feng Longbiao^1,2

1. Faculty of Materials and Energy, Guangdong University of Technology, Guangzhou Guangdong 510006, China;
2. Guangdong Institute of Materials and Processing, Guangzhou Guangdong 510650, China

Received:2019-08-17 Online:2020-02-25 Published:2020-04-03

摘要/Abstract

摘要：

为了研究镁合金经异步轧制后的微观组织及织构演变,使用4种不同异速比对挤压态的Mg-3Zn-2(Ce/La)-1Mn合金进行异步轧制试验。结果表明:相对于初始的挤压态样品,异步轧制后的组织更均匀细小;随着异速比的增大,再结晶晶粒数量增多,第二相破碎,晶粒和第二相粒子的尺寸减小,组织的均匀化程度提高;样品中主要存在两种第二相,即α-Mn相和Mg_xZn_y-Mn-(Ce/La)相;锥面<c+a>滑移及基面<a>滑移在异步轧制过程中扮演着重要的角色,且基面取向出现了从RD向TD的30°~45°偏转,织构逐渐趋于随机化。强剪切应变的引入、<c+a>锥面滑移以及基极的偏转对织构的随机化具有显著的影响。

关键词: 镁合金, 异步轧制, 微观组织, 织构

Abstract:

In order to investigate the microstructure and texture evolution of magnesium alloy subjected to differential speed rolling (DSR) with different speed ratios, four different speed ratios were carried out on extruded Mg-3Zn-2(Ce/La)-1Mn alloys. The results indicate that the more uniform and finer microstructure is obtained after DSR compared to the initial extruded specimen. With the increment of SR, the amount of recrystallized grains increases, the size of grains and secondary phase particles are reduced, then the extent of homogenization of microstructure is improved. There are mainly two kinds of second phases in the sample, namely α-Mn phase and Mg_xZn_y-Mn-(Ce/La) phase. The <c+a> pyramidal slip and the basal <a> slip both play a major role during DSR. The basal plane orientation is inclined by 30°-45° from the RD toward the TD, and the texture gradually trends to be randomized. The introduction of intensive shear strain, trigger of the <c+a> pyramidal slip and tilting of basal poles have a significant effect on the randomization of the texture.

Key words: Mg alloy, differential speed rolling, microstructure, texture

中图分类号:

TG339

宋旭东, 袁鸽成, 黎小辉, 奉隆彪. 异步轧制Mg-3Zn-2(Ce/La)-1Mn合金的微观组织及织构演变[J]. 金属热处理, 2020, 45(2): 1-6.

Song Xudong, Yuan Gecheng, Li Xiaohui, Feng Longbiao. Microstructure and texture evolution of differential speed rolled Mg-3Zn-2(Ce/La)-1Mn alloy[J]. HTM, 2020, 45(2): 1-6.

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异步轧制Mg-3Zn-2(Ce/La)-1Mn合金的微观组织及织构演变

Microstructure and texture evolution of differential speed rolled Mg-3Zn-2(Ce/La)-1Mn alloy

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