<strong>AZ31</strong>镁合金室温多道次压缩过程微观组织和织构演变的研究

doi:10.11900/0412.1961.2019.00050

金属学报

2019, Vol. 55

Issue (8): 976-986 DOI: 10.11900/0412.1961.2019.00050

本期目录 | 过刊浏览

AZ31镁合金室温多道次压缩过程微观组织和织构演变的研究

邓丽萍¹,崔凯旋²,汪炳叔²(

),向红亮¹,李强²

1. 福州大学机械工程及自动化学院福州 350108
2. 福州大学材料科学与工程学院福州 350108

Microstructure and Texture Evolution of AZ31 Mg Alloy Processed by Multi-Pass Compressing Under Room Temperature

Liping DENG¹,Kaixuan CUI²,Bingshu WANG²(

),Hongliang XIANG¹,Qiang LI²

1. School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350108, China
2. College of Materials Science and Engineering, Fuzhou University，Fuzhou 350108, China

引用本文:

邓丽萍,崔凯旋,汪炳叔,向红亮,李强. AZ31镁合金室温多道次压缩过程微观组织和织构演变的研究[J]. 金属学报, 2019, 55(8): 976-986.
Liping DENG, Kaixuan CUI, Bingshu WANG, Hongliang XIANG, Qiang LI. Microstructure and Texture Evolution of AZ31 Mg Alloy Processed by Multi-Pass Compressing Under Room Temperature[J]. Acta Metall Sin, 2019, 55(8): 976-986.

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摘要:

对AZ31镁合金在室温进行多道次压缩变形，利用EBSD技术研究其微观组织和织构演变，分析孪晶在细化晶粒和调控织构方面发挥的作用。结果表明：多道次压缩过程中的组织和织构演变主要受 ${10 1 ˉ 2}$ 拉伸孪生影响，道次应变量越大，织构变化越明显，每道次压缩后，利于拉伸孪生的晶粒取向发生孪生转到压缩轴附近，从而弱化初始基面织构，而退孪晶的发生则不利于细化晶粒和弱化织构。在多道次压缩过程中，孪生Schmid准则支配着变形中的 ${10 1 ˉ 2}$ 孪晶变体的选择，从而控制织构的演变。残留的基体、预变形产生的孪晶与后续变形中产生的孪晶片层相互交叉，分割细化晶粒；道次变形量会影响多向变形过程每道次孪晶的激活量和孪晶片层的形貌，从而影响晶粒的细化程度。

关键词 ：镁合金, 多道次变形, 孪生, 织构, 晶粒细化

Abstract：

Mg alloy has hexagonal structure and exhibits poor workability at room temperature, which is attributed to the difficulty in activating a sufficient number of independent slips to accommodate the deformation. Twinning plays an important role in plastic deformation of Mg alloys during low and medium temperature to accommodate the imposed strain, especially the strain along the c-axis. Therefore, the microstructure and texture evolutions of AZ31 Mg alloy during multi-pass compressions at room temperature were investigated by EBSD technology. The results show that the microstructure and texture evolutions are mainly controlled by tension twinning during multi-pass compression. And the more the strain passes, the severer the texture transformation. The c-axes of the grains are almost rotated to the compression direction by tension twins. The twins generated during multi-directional compression can separate grains and then refine them. However, the de-twinning can rotate the grains back to the initial orientations, which is against the texture weakening. The Schmid law governs the characteristics of {10 $1 ˉ$ 2} twinning, and thus controls the texture evolution. Both the residual matrix and the pre-deformation induced twins intersect with the twins generated during subsequent deformation. And this can separate the grains and weaken the texture strength. The number and morphology of the activated twin behavior during multi-pass compression would be influenced by the pass reductions, consequently affecting the grain refinement.

Key words： Mg alloy multi-pass deformation twinning texture grain refinement

收稿日期: 2019-02-26

ZTFLH:

TG146.22

基金资助:国家自然科学基金项目((Nos.51301040 and 51601039));中国博士后科学基金项目(No.2016M590591)

作者简介: 邓丽萍，女，1986年生，副教授，博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00050 或 https://www.ams.org.cn/CN/Y2019/V55/I8/976

图1 变形前AZ31镁合金板材的微观组织、织构及压缩试样取样示意图

图2 样品沿TD3.0%-RD3.0%-ND3.1%路径压缩的取向成像图和界面结构图

图3 样品沿TD5.5%-RD5.0%-ND5.2%路径压缩的取向成像图和界面结构图

表2 沿TD5.5%-RD5.0%-ND5.2%路径压缩各道次孪晶体积分数和单位面积孪晶界面长度

表1 沿TD3.0%-RD3.0%-ND3.1%路径压缩各道次孪晶体积分数、平均单位晶粒孪晶片层数和单位面积孪晶界面长度

图4 沿TD3.0%-RD3.0%-ND3.1%和TD5.5%-RD5.0%-ND5.2%路径压缩的织构演变

图5 TD5.5%-RD5.0%-ND5.2%压缩过程中{101ˉ2}孪生的Schmid因子分析示意图

图6 TD3.0%-RD3.0%-ND3.1%样品孪晶细化晶粒行为EBSD取向成像图和{0001}极图分析

图7 TD5.5%-RD5.0%和TD5.5%-RD5.0%-ND5.2%样品孪晶细化晶粒行为EBSD取向成像图和{0001}极图分析

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