Design Method of Immiscible Dissimilar Welding (Mg/Fe) Based on CALPHAD and Thermodynamic Modelling

Zang, Chengwei and Zhao, Xiaoye and Xia, Hongbo and Wen, Wei and Tan, Zhuoming and Tan, Caiwang and Rivera-Díaz-del-Castillo, Pedro E.J. (2024) Design Method of Immiscible Dissimilar Welding (Mg/Fe) Based on CALPHAD and Thermodynamic Modelling. Materials and Design: 113050. ISSN 0261-3069 (In Press)

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Joining dissimilar metals is a major challenge in joining technology; the weldability of immiscible systems is especially challenging. In this study, a design methodology for dissimilar welding is suggested. The Miedema model and Toop model are developed to calculate the thermodynamics of quaternary alloy systems (Mg-Fe-Al-Cu). Finite element modelling (FEM) of temperature fields and the calculation of phase diagrams (CALPHAD) are combined to provide prerequisite information for modelling. As a test subject, laser welded lap configuration joints of AZ31B magnesium alloy and DP590 steel with a copper coating were put into the design scheme. The interfacial elemental diffusion and formation of intermetallics (IMCs) along the interface during the welding process are predicted. This simulation design scheme predicts the interfacial reaction kinetics and identifies whether the intermediate element works or not. The effects of the Cu coating thickness on the weld constitution, interfacial microstructures and mechanical properties were studied. Cu coating promotes the weld formation fostering the metallurgical reaction of the fusion zone (FZ) with the steel brazing interface. The mechanism of interfacial reactions during the welding-brazing process has been clarified. The Vickers hardness distribution across the interface shows that the Cu-IMCs are ductile.

Item Type:
Journal Article
Journal or Publication Title:
Materials and Design
Uncontrolled Keywords:
?? mechanics of materialsmaterials science(all)mechanical engineering ??
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Deposited On:
06 Jun 2024 13:00
In Press
Last Modified:
06 Jun 2024 13:00