Print Email Facebook Twitter Investigation into Atomic Diffusion at the Interface During Extrusion Welding of Magnesium and Magnesium Alloys Title Investigation into Atomic Diffusion at the Interface During Extrusion Welding of Magnesium and Magnesium Alloys Author Bai, Shengwen (Chongqing University; Tsinghua University) Fang, Gang (Tsinghua University) Jiang, Bin (Chongqing University; Chongqing Academy of Science and Technology) Zhou, J. (TU Delft Biomaterials & Tissue Biomechanics) Date 2021 Abstract This research was aimed to reveal atomic diffusion across the bonding interface through the extrusion-welding experiments of dissimilar materials, namely pure magnesium and Mg–Al–Zn–RE alloy. A special tooling setup used to simulate weld seam formation during extrusion through a porthole die was designed for this model study. To deform the metal streams symmetrically and create a sound weld seam, the extrusion-welding experiments from sandwich-structured billets were carried out. Chemical analysis of diffused atoms in the welding region was performed by electron probe micro-analysis. The results confirmed that atomic diffusion indeed occurred across the interface during extrusion. The gradients in element concentration, local stresses, and hydrostatic pressure were considered to be the necessary conditions for extensive atomic diffusion to occur. Atomic diffusion was significantly enhanced by raising extrusion temperature. The analysis of the stress and hydrostatic pressure distributions in the welding region provided new insights into the mechanisms of weld seam formation during the extrusion of light metals. To reference this document use: http://resolver.tudelft.nl/uuid:6275fad8-a22e-4160-86eb-b183d8713cf0 DOI https://doi.org/10.1007/s11661-021-06381-8 Embargo date 2022-07-15 ISSN 1073-5623 Source Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science, 52 (9), 4222-4233 Bibliographical note Accepted Author Manuscript Part of collection Institutional Repository Document type journal article Rights © 2021 Shengwen Bai, Gang Fang, Bin Jiang, J. Zhou Files PDF Accepted_version_with_a_s ... _space.pdf 1.85 MB Close viewer /islandora/object/uuid:6275fad8-a22e-4160-86eb-b183d8713cf0/datastream/OBJ/view