A novel method for simultaneously improving the strength and ductility of AZ31 friction stir welded joint

Junlei Zhang; Shengli Tao; Xiang Chen; Zulai Li; Weizhang Wang; Guangsheng Huang

Journal of Materials Research and Technology (Sep 2024)

A novel method for simultaneously improving the strength and ductility of AZ31 friction stir welded joint

Junlei Zhang,
Shengli Tao,
Xiang Chen,
Zulai Li,
Weizhang Wang,
Guangsheng Huang

Affiliations

Junlei Zhang: College of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China
Shengli Tao: College of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China
Xiang Chen: College of Materials Science and Engineering, Hubei University of Automotive Technology, Shiyan, 442002, China; Shiyan Key Laboratory of Advanced Automotive Aluminum Alloy (Hubei University of Automotive Technology), China; Corresponding author. College of Materials Science and Engineering, Hubei University of Automotive Technology, Shiyan, 442002, China.
Zulai Li: College of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China
Weizhang Wang: State Key Laboratory of Mechanical Transmission, College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China
Guangsheng Huang: State Key Laboratory of Mechanical Transmission, College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China

Journal volume & issue: Vol. 32
pp. 2326 – 2333

Abstract

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In this study, a novel localized selective remelting technique was proposed to treat the welding interface regions on the top and bottom surfaces of the AZ31 friction stir welded joint. Compared with the untreated joint, the treated joint achieved a favorable combination of strength (ultimate tensile strength of 238 MPa) and ductility (elongation of 13.3%). Digital image correlation (DIC) characterization revealed that the high strain-hardening ability primarily stemmed from the substantial mitigation of strain localization, which was caused by a comprehensive factor, including reduced SF value fluctuation between weld micro-zones, low residual dislocation density, and numerous extension twinning activation in the nugget zone.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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