Synthesis and characterization of lightweight Al35Mg35Mn2Sn8Zn20 entropic alloy

Articles in Press

Document Type : Original Research Article

Authors

1 Department of Materials Engineering, Faculty of Engineering, Hakim Sabzevari University, Sabzevar, Iran.

2 Department of materials and polymer engineering, Hakim Sabzevari University.

10.22034/frj.2023.418420.1186

Abstract

Entropic lightweight alloys are a category of lightweight alloys that have recently gained attention. The main characteristic of these alloys is their high hardness compared to standard lightweight alloys. In this study, a new entropic alloy with Al35Mg35Mn2Sn8Zn20 (in atomic percentage) composition was produced and characterized. The alloy was synthesized in an induction furnace. Casting was performed in three molds including preheated mold, non-preheated mold, and water cooled mold. The results showed that the microstructure of the alloy consists of a high volume fraction of intermetallic compounds Mg32(Al,Zn)49, Mg2Sn, Al6Mn, and Al4Mn, along with a solid solution of Al. Approximately 50% of the volume fraction in all three samples consists of a eutectic structure of Al/Mg32(Al,Zn)49. After the eutectic structure, the phases of pre-eutectic Mg32(Al,Zn)49, Mg2Sn, and intermetallic Al-Mn compounds have the highest volume fraction in the microstructure respectively. Increasing the cooling rate results in a reduction in the size of the phases. The hardness values for the samples frozen in preheated mold, non-preheated mold, and water cooled mold were measured as 199.17, 227.14, and 237.63 Vickers, respectively, which is much higher than the hardness of standard cast aluminum alloys.

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Articles in Press, Accepted Manuscript
Available Online from 09 November 2023

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History

  • Receive Date: 28 September 2023
  • Revise Date: 06 November 2023
  • Accept Date: 09 November 2023

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