Synchrotron experiment and simulation studies of magnesium-steel interface manufactured by impact welding

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:813

Article

Xiong, Lianghua¹  Cheng, Jiahao²  Chuang, Andrew Chihpin³  Hu, Xiaohua²  Sun, Xin²  Singh, Dileep¹ 

[1] Argonne Natl Lab, Appl Mat Div, Lemont, IL 60439 USA

[2] Oak Ridge Natl Lab, Energy & Transportat Sci Div, Oak Ridge, TN 37831 USA

[3] Argonne Natl Lab, Xray Sci Div, Lemont, IL 60439 USA

关键词: Synchrotron characterization;    Finite-element modeling;    Mg-steel interface;    Impact welding;   

DOI  :  10.1016/j.msea.2021.141023

来源: Elsevier

【 摘 要 】

The effective weight reduction in the automotive industry by the wide adoption of lightweight magnesium (Mg) alloys demands high-quality joint between magnesium alloys and massively-used steels in order to wring the excess weight with strength and safety assurance. However, Mg-steel joint is difficult to achieve because there is no mutual solubility between magnesium and steel and huge disparity in physical properties. An impact-based welding method recently showed successful Mg-steel joining. In this work, the characteristics of Mg-steel interface joined by the impact welding method were investigated. Synchrotron high-energy X-ray computed tomography and diffraction were applied to characterize the microstructure across Mg-steel interface. Results revealed a deposit layer formed at the joint interface where Fe-rich particles spread deep into the Mg matrix. High-resolution 3D morphology of Mg-steel interface demonstrated the trapped pores and cracks inside the deposit layer. The formation of the deposit layer and the void/cracking evolution were analyzed by using finite element models. These findings provide insights into the immiscible Mg-steel joining process.

【 授权许可】

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