焊前搅拌摩擦处理使AZ91镁合金能够进行强韧性熔焊

IF 3.1 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Science and Technology of Welding and Joining Pub Date : 2022-10-31 DOI:10.1080/13621718.2022.2140253

Hasan Jiryaei Sharahi, M. Pouranvari, M. Movahedi

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引用次数: 0

摘要

铸态AZ91镁合金的部分熔化区（PMZ）液化是其焊接性的关键问题。搅拌摩擦处理（FSP）被用作局部焊前处理，以在电弧焊接过程中在铸造AZ91合金中产生局部抗液化微观结构。研究了焊前FSP过程中刀具转速对熔接AZ91的液化相关微观结构特征（即共晶β-Mg17Al12的晶粒结构、尺寸和体积分数）以及液化特征（即PMZ尺寸和晶界液膜厚度）的影响。铸造AZ91的焊前FSP处理显著提高了焊缝的抗拉强度和延展性，这主要是由于PMZ中再凝固共晶β-Mg17Al12膜的厚度显著减小。

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Pre-weld friction stir processing enabling strong and ductile fusion welds on AZ91 magnesium alloy

Liquation in the partially melted zone (PMZ) is the critical weldability issue of cast AZ91 magnesium alloy. Friction stir processing (FSP) is used as a local pre-weld treatment to create a local liquation-resistant microstructure in cast AZ91 alloy during arc welding. The effects of tool rotational speed during pre-weld FSP on the liquation-related microstructural features (i.e. grain structure, size and volume fraction of eutectic β-Mg17Al12) and the liquation characteristics of the fusion-welded AZ91 (i.e. PMZ size and grain boundary liquid film thickness) were investigated. The pre-weld FSP treatment of the cast AZ91 significantly improved the tensile strength and ductility of the welds mainly due to significant reduction in the thickness of the re-solidified eutectic β-Mg17Al12 film in the PMZ.

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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.