材料流动对AZ40M/AZ61A异种镁合金搅拌摩擦焊接接头织构演化及拉伸断裂行为的影响

IF 3.2 2区 材料科学 Q2 ENGINEERING, MECHANICAL
Liang Wang, Chengwu Cui, Peishan Zhou, Bin Wang, Hualin Zheng
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引用次数: 0

摘要

研究了材料流动对AZ40M/AZ61A异种镁合金搅拌摩擦焊接头织构演化和拉伸断裂行为的影响。搅拌销主要影响搅拌区中部和顶部(SZ)之间的物料流动。SZ由于动态再结晶(DRX),晶粒呈细小等轴晶粒,平均晶粒尺寸为19.9 μm。SZ中心呈现强烈的典型基底织构,织构强度约为随机分布的63.333倍,使接头力学性能恶化。异种镁合金焊接接头的屈服强度为172 MPa,约为母材的75%。AZ40M和SZ边缘硬度最低,为54.8 HV,是接头的软化区,在拉伸过程中导致裂纹扩展和断裂。拉伸裂纹在SZ边缘靠近硬度最低的AS处萌生,并沿SZ中心扩展。裂纹路径取决于“洋葱环结构”和第二相。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Effects of Material Flow on Texture Evolution and Tensile Fracture Behaviors of Friction Stir Welded AZ40M/AZ61A Dissimilar Mg Alloys Joint

This study aims to elucidate the effects of material flow on texture evolution and tensile fracture behaviors of friction stir welding (FSW) AZ40M/AZ61A dissimilar Mg alloys joint. The stirring pin mainly affects the material flow between the middle and top of the stir zone (SZ). The SZ presented fine and equiaxed grains because of dynamic recrystallization (DRX), and the average grain size is 19.9 μm. The SZ center presented the strong typical basal texture with a texture intensity of about 63.333 times random distribution that deteriorates the joint mechanical properties. The yield strength of the dissimilar Mg alloy welded joint is 172 MPa, which is about 75% of the base metals. The AZ40M and SZ edge has the lowest hardness of 54.8 HV, which is the softened area of the joint, resulting in crack propagation and fracture during the tensile process. The tensile crack was initiated at the edge of the SZ near the AS with the lowest hardness and propagated along the SZ center. The crack path depended on the “onion-ring structure” and the second phase.

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来源期刊
CiteScore
6.30
自引率
18.90%
发文量
256
审稿时长
4 months
期刊介绍: Fatigue & Fracture of Engineering Materials & Structures (FFEMS) encompasses the broad topic of structural integrity which is founded on the mechanics of fatigue and fracture, and is concerned with the reliability and effectiveness of various materials and structural components of any scale or geometry. The editors publish original contributions that will stimulate the intellectual innovation that generates elegant, effective and economic engineering designs. The journal is interdisciplinary and includes papers from scientists and engineers in the fields of materials science, mechanics, physics, chemistry, etc.
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