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Effect of liquation on the tensile properties of cast Mg–9Al–1Zn Alloy fusion welds

Pouranvari, M ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1080/13621718.2020.1805855
  3. Publisher: Taylor and Francis Ltd , 2020
  4. Abstract:
  5. This paper aims at understanding the role of liquation and solidification phenomena on the tensile properties of arc welded cast AZ91 magnesium alloy. Owing to its refined microstructure, the fusion zone exhibited improved ductility/strength compared to the base metal. It is demonstrated that the partially melted zone (PMZ) which is characterised by constitutional liquation of eutectic β-Mg17Al12 phase is the weakest link in the weldment. The reduced strength and ductility associated with the liquation phenomena are due to the increased volume fraction and thickness of the eutectic β-Mg17Al12 in the PMZ as well as the formation of liquation micro-cracks in a network of brittle intermetallic compounds. Controlling the liquation phenomena is critical for producing sound and reliable cast AZ91 arc welds. © 2020 Institute of Materials, Minerals and Mining. Published by Taylor & Francis on behalf of the Institute
  6. Keywords:
  7. Liquation ; Mg alloys ; Strength ; Welding ; Ductility ; Electric welding ; Eutectics ; Solidification ; Welds ; AZ91 magnesium alloys ; Constitutional liquation ; Fusion zones ; Mg17Al12 phase ; Partially melted zone ; Refined microstructure ; Strength and ductilities ; Weakest links ; Magnesium alloys
  8. Source: Science and Technology of Welding and Joining ; Volume 25, Issue 8 , 2020 , Pages 698-705
  9. URL: https://www.tandfonline.com/doi/abs/10.1080/13621718.2020.1805855?journalCode=ystw20