错距旋压AZ31镁合金管材的微观组织演变及耐蚀性能

郑凡林; 陈洪胜; 张媛琦; 王文先; 聂慧慧

doi:10.1007/s12613-021-2396-x

Volume 29 Issue 7

Jul. 2022

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文章导航 > 矿物冶金与材料学报（英文） > 2022 > 29(7): 1361-1372

Fanlin Zheng, Hongsheng Chen, Yuanqi Zhang, Wenxian Wang, and Huihui Nie, Microstructure evolution and corrosion resistance of AZ31 magnesium alloy tube by stagger spinning, Int. J. Miner. Metall. Mater., 29(2022), No. 7, pp. 1361-1372. https://doi.org/10.1007/s12613-021-2396-x

Cite this article as:

Fanlin Zheng, Hongsheng Chen, Yuanqi Zhang, Wenxian Wang, and Huihui Nie, Microstructure evolution and corrosion resistance of AZ31 magnesium alloy tube by stagger spinning, Int. J. Miner. Metall. Mater., 29(2022), No. 7, pp. 1361-1372. https://doi.org/10.1007/s12613-021-2396-x

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研究论文

错距旋压AZ31镁合金管材的微观组织演变及耐蚀性能

1)
太原理工大学机械与运载工程学院，太原 030024，中国
2)
先进镁基材料山西省重点实验室，太原 030024，中国
3)
太原理工大学材料科学与工程学院，太原 030024，中国

通讯作者:
陈洪胜 E-mail: chenhongsheng@tyut.edu.cn

文章亮点

(1) 系统地研究了AZ31镁合金管材变形过程中的微观组织的演变规律。

(2) 讨论了多道次旋压变形AZ31镁合金管材的晶粒细化机制。

(3) 分析了错距旋压AZ31镁合金管材耐蚀性能的变化规律及影响机制。

中文摘要

本文采用强力错距正旋技术制备了AZ31镁合金管材，结合电子背散射衍射和透射电镜研究了其微观结构演变，并通过电化学腐蚀试验分析了管材的耐蚀性能。结果表明：经第三道次旋压后，沿AZ31镁合金管壁厚方向的晶粒明显更均匀且更细小。随着旋压道次的增加，孪晶数量先增加后减少，而小角度晶界的变化趋势则与孪晶的相反。随着总旋压变形量的增加，变形织构先增加且{0001}晶面的c轴逐渐向管材的轴向偏转，然后变形织构降低且晶粒的取向变得更随机。在第一道次和第二道次旋压过程中，晶粒细化的主要机制为孪晶诱导的动态再结晶和晶界弓出形核长大；而第三道次变形中管材的晶粒细化机制则为高温动态回复，其微观组织以亚结构为主。经过旋压变形后，由于孪晶和高密度位错的共同作用，AZ31合金管的耐蚀性降低。

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Research Article

Microstructure evolution and corrosion resistance of AZ31 magnesium alloy tube by stagger spinning

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Abstract

Abstract

This study fabricates an AZ31 magnesium alloy tube by spinning technology-power stagger forward spinning. The microstructure evolution of the tube is investigated by combining electron backscatter diffraction and transmission electron microscopy analysis, and the corrosion resistance is measured by an electrochemical corrosion test. Results show that the grains are obviously more uniform and finer along the wall thickness’s direction of the AZ31 alloy tube after the third spinning pass. The number of twins ascends first and then descends, while the varying trend of low-angle grain boundaries (LAGBs) is opposite to that of the twins as the spinning pass increases. With the increase of the total spinning deformation, the deformation texture initially increases and the c-axis of the {0001} crystal plane gradually rotates to the axial direction of the tube; the deformation texture then decreases and the orientation of grains becomes more random. The main mechanism of grain refinement is dynamic recrystallization by the twin-induced way and bowing out of the nucleation at grain boundaries during the first and second pass. However, the dominant mechanism of the refined grain is the high-temperature dynamic recovery in the third pass, and the microstructure mainly consists of substructured grains. After the spinning deformation, the corrosion resistance of the AZ31 alloy tube decreases due to the combined effect of twins and high density-dislocations.
- AZ31 magnesium alloy;
- power stagger forward spinning;
- microstructure evolution;
- corrosion resistance

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