Investigation of the microstructure and mechanical properties of Mg–Al–Zn alloy joints formed by different laser welding processes

IF 1.6 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

High Temperature Materials and Processes Pub Date : 2023-01-01 DOI:10.1515/htmp-2022-0292

Qi Luo, Shaogang Wang, Yingying Guo

引用次数: 0

Abstract

Abstract The microstructure and mechanical properties of Mg–Al–Zn alloy joints by using autogenous laser beam welding (LBW) and laser-MIG hybrid welding, respectively, are investigated. The results show that the weld formation of the hybrid welding joint is relatively good, and there are mainly α-Mg matrix phases and β-Mg 17 Al 12 strengthening phases in the weld metal. The microstructure in the fusion zone (FZ) of the two joints is different. The LBW joint is composed of columnar crystal and equiaxed dendrite. The hybrid welding joint consists of fine equiaxed grains, and the grain size in the laser zone is larger than that in the arc zone. The microhardness in FZ is higher due to the precipitation of the β-Mg 17 Al 12 phase in this region. Under the optimized welding procedure, the strength coefficient of the two joints is >90%. There are many dimples on the tensile fracture surface of the hybrid welding joint, which is characterized by the pattern of the ductile fracture.

查看原文本刊更多论文

不同激光焊接工艺对Mg-Al-Zn合金接头组织和力学性能的影响

摘要:研究了自激光束焊接(LBW)和激光- mig复合焊接Mg-Al-Zn合金接头的组织和力学性能。结果表明:复合焊接接头焊缝成形较好，焊缝金属中主要存在α-Mg基体相和β- mg17al - 12强化相;两种接头的熔合区(FZ)组织不同。LBW接头由柱状晶和等轴枝晶组成。混合焊接接头由细小的等轴晶粒组成，激光区晶粒尺寸大于电弧区晶粒尺寸。由于β- mg17al12相在FZ区析出，使得FZ区的显微硬度较高。在优化的焊接工艺下，两个接头的强度系数为90%。复合焊接接头的拉伸断口表面有许多韧窝，具有韧性断裂的特征。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

High Temperature Materials and Processes 工程技术-材料科学：综合

CiteScore

2.50

自引率

0.00%

发文量

审稿时长

3.9 months

期刊介绍： High Temperature Materials and Processes offers an international publication forum for new ideas, insights and results related to high-temperature materials and processes in science and technology. The journal publishes original research papers and short communications addressing topics at the forefront of high-temperature materials research including processing of various materials at high temperatures. Occasionally, reviews of a specific topic are included. The journal also publishes special issues featuring ongoing research programs as well as symposia of high-temperature materials and processes, and other related research activities. Emphasis is placed on the multi-disciplinary nature of high-temperature materials and processes for various materials in a variety of states. Such a nature of the journal will help readers who wish to become acquainted with related subjects by obtaining information of various aspects of high-temperature materials research. The increasing spread of information on these subjects will also help to shed light on relevant topics of high-temperature materials and processes outside of readers’ own core specialties.