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

Jiryaei Sharahi, H ; Sharif University of Technology | 2023

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  1. Type of Document: Article
  2. DOI: 10.1080/13621718.2022.2140253
  3. Publisher: Taylor and Francis Ltd , 2023
  4. Abstract:
  5. 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. © 2022 Institute of Materials, Minerals and Mining. Published by Taylor & Francis on behalf of the Institute
  6. Keywords:
  7. Cast AZ91 magnesium alloy ; Friction stir processing ; Fusion welding ; Liquation ; Mechanical properties ; Partially melted zone
  8. Source: Science and Technology of Welding and Joining ; Volume 28, Issue 2 , 2023 , Pages 162-171 ; 13621718 (ISSN)
  9. URL: https://www.tandfonline.com/doi/abs/10.1080/13621718.2022.2140253