双峰组织ZA21镁合金棒材的拉–压不对称性及变形机制研究

王玉娇; 张韵; 江海涛

doi:10.1007/s12613-021-2388-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): 92-103

Yujiao Wang, Yun Zhang, and Haitao Jiang, Tension–compression asymmetry and corresponding deformation mechanism in ZA21 magnesium bars with bimodal structure, Int. J. Miner. Metall. Mater., 30(2023), No. 1, pp. 92-103. https://doi.org/10.1007/s12613-021-2388-x

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Yujiao Wang, Yun Zhang, and Haitao Jiang, Tension–compression asymmetry and corresponding deformation mechanism in ZA21 magnesium bars with bimodal structure, Int. J. Miner. Metall. Mater., 30(2023), No. 1, pp. 92-103. https://doi.org/10.1007/s12613-021-2388-x

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研究论文

双峰组织ZA21镁合金棒材的拉–压不对称性及变形机制研究

1)
北京科技大学工程技术研究院，北京 100083，中国
2)
北京机械设备研究所，北京 100854，中国

通讯作者:
张韵 E-mail: zhangyun@ustb.edu.cn

江海涛 E-mail: jianght@ustb.edu.cn

文章亮点

(1) 制备了具有完全再结晶晶粒且织构特征相同的双峰组织镁合金棒材，研究了其轴向拉-压不对称性。

(2) 揭示了拉伸孪晶变体选择的决定性因素。

(3) 通过改进的霍尔-佩奇公式提出了双峰组织强化屈服强度的条件。

中文摘要

本文通过挤压及热处理分别制备了两种具有完全再结晶晶粒的ZA21镁合金棒材，分别为晶粒尺寸成大小两种状态分布的双峰组织以及晶粒尺寸均匀的均匀组织，对这两种棒材沿轴向分别进行了拉伸及压缩试验，旨在研究具有双峰组织和均匀组织特征的ZA21镁合金棒材的拉伸−压缩不对称性（拉−压不对称性），并揭示相应变形机制。结果表明，拉伸和压缩状态下双峰组织的屈服强度分别为206.42和140.28 MPa,高于均匀组织在拉伸和压缩状态的屈服强度，分别为183.71和102.86 MPa。变形过程中，拉伸状态下的柱面滑移和拉伸孪生、压缩状态下的基面滑移和拉伸孪生主导了屈服行为，导致了轴向拉−压不对称性。然而，由于拉伸状态下细晶中基面滑移的激活以及压缩状态下细晶对拉伸孪生的抑制作用，相较于均匀组织较高的拉-压不对称性（0.56），双峰组织的拉−压不对称性（0.68）明显降低。变形过程中出现了多种拉伸孪晶，孪晶变体的选择取决于母晶可能激活的六种变体的施密特因子。此外，通过改进的霍尔−佩奇公式，发现双峰组织对屈服的强化作用取决于平均晶粒尺寸以及粗晶和细晶的占比。

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Research Article

Tension–compression asymmetry and corresponding deformation mechanism in ZA21 magnesium bars with bimodal structure

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Abstract

Abstract

We investigated the asymmetric tension–compression (T–C) behavior of ZA21 bars with bimodal and uniform structures through axial tension and compression tests. The results show that the yield strengths of bars having bimodal structure are 206.42 and 140.28 MPa under tension and compression, respectively, which are higher than those of bars having uniform structure with tensile and compressive yield strength of 183.71 and 102.86 MPa, respectively. Prismatic slip and extension twinning under tension and basal slip and extension twinning under compression dominate the yield behavior and induce the T–C asymmetry. However, due to the basal slip activated in fine grains under tension and the inhibition of extension twinning by fine grains under compression, the bimodal structure possesses a lower T–C asymmetry (0.68) compared to the uniform structure (0.56). Multiple extension twins occur during deformation, and the selection of twin variants depends on the Schmid factor of the six variants activated by parent grains. Furthermore, the strengthening effect of the bimodal structure depends on the grain size and the ratio of coarse and fine grains.
- bimodal structure;
- deformation mechanism;
- Hall–Petch relationship;
- tension–compression asymmetry;
- twin variant selection

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