Journal of Advanced Materials and Technologies

Journal of Advanced Materials and Technologies

Microstructural Investigation of The Cast and Homogenized Al10Co25Cr8Fe15Ni36Ti6 High Entropy Alloy

Document Type : Original Reaearch Article

Authors
Seyed Mahdi Abbasi 1
Masumeh Seifollahi 2
Ebrahim Yousefi 3
1 Professor, Faculty of Materials & Manufacturing Technologies, Malek Ashtar University of Technology, Tehran, Iran.
2 Assistant Professor, Faculty of Materials & Manufacturing Technologies, Malek Ashtar University of Technology, Tehran, Iran.
3 Researcher, Faculty of Materials & Manufacturing Technologies, Malek Ashtar University of Technology, Tehran, Iran.
10.30501/jamt.2024.419852.1290
Abstract
The as-cast and homogenized microstructures of Al10Co25Cr8Fe15Ni36Ti6 high entropy alloy were investigated in this study. To this end, the high entropy alloy was produced using vacuum induction melting and electro slag remelting processes, and the ESRed block was homogenized at the temperature of 1220 °C for 17 hr. The as-cast, as ESRed and homogenized microstructures were then investigated using optical microscopy, scanning electron microscopy, and X-ray diffraction. On the basis of theoretical measurements, the mixing entropy, atomic size differences, and Valence electron concentration were obtained as 13.05 kJ/mol, 8.8, and 7.97, respectively. These values can predict the formation of a solid solution matrix as the type of BCC + FCC and intermetallic phases. The as-cast microstructure included γ+ γʹ in the dendritic zones and γʹ+ NiAl in the interdendritic areas. After homogenization, the dendritic structures were almost eliminated, and they became discontinuous which is an indication of elements distribution homogenization. NiAl phase was also omitted after the homogenization process.
Keywords
High Entropy Alloys
Al10Co25Cr8Fe15Ni36Ti6
Microstructure
Homogenization

Subjects

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Journal of Advanced Materials and Technologies
Volume 13, Issue 1
Spring 2024
Pages 46-56

  • Receive Date 29 October 2023
  • Revise Date 17 January 2024
  • Accept Date 10 March 2024