Microstructure and enhanced mechanical performances of dissimilar Mg alloys fabricated by pulse current-assisted friction stir welding (PCaFSW)

IF 2.9 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Science and Technology of Welding and Joining Pub Date : 2023-02-02 DOI:10.1080/13621718.2023.2172651

Ziqian Wang, Yongyong Liu, T. Yuan, Lei Wang, Shujun Chen, Qiang Gao

引用次数: 1

Abstract

The dissimilar AZ31B/AZ61 Mg alloy joints were fabricated by pulse current-assisted friction stir welding (PCaFSW). The maximum tensile strength and elongation were 314.28 MPa and 13.66%, respectively. A micro interlocking structure was formed and the grain refinement effect was enhanced by the PCaFSW process, which was improved relative to that in the conventional FSW. The enhanced strength and plasticity with increasing pulse current were attributable to the grain refinement, weakening of texture strength, formation of nano-scale precipitates and increase of short dislocation lines. The fracture mode was transformed from a brittle fracture mode to a combined fracture mode of brittle and ductile fractures.

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脉冲电流辅助搅拌摩擦焊（PCaFSW）制备的异种镁合金的组织和增强的力学性能

采用脉冲电流辅助搅拌摩擦焊（PCaFSW）制备了AZ31B/AZ61镁合金异种接头。最大抗拉强度和伸长率为314.28 MPa和13.66%。PCaFSW工艺形成了微互锁结构，并增强了晶粒细化效果，与传统FSW工艺相比有所改善。随着脉冲电流的增加，强度和塑性的增强归因于晶粒细化、织构强度减弱、纳米级沉淀物的形成和短位错线的增加。断裂模式由脆性断裂模式转变为脆性和韧性断裂的复合断裂模式。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Science and Technology of Welding and Joining 工程技术-材料科学：综合

CiteScore

6.10

自引率

12.10%

发文量

审稿时长

1.7 months

期刊介绍： Science and Technology of Welding and Joining is an international peer-reviewed journal covering both the basic science and applied technology of welding and joining. Its comprehensive scope encompasses all welding and joining techniques (brazing, soldering, mechanical joining, etc.) and aspects such as characterisation of heat sources, mathematical modelling of transport phenomena, weld pool solidification, phase transformations in weldments, microstructure-property relationships, welding processes, weld sensing, control and automation, neural network applications, and joining of advanced materials, including plastics and composites.