Significant hardening due to the formation of a sigma phase matrix in a high entropy alloy

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Ming-Hung Tsai
  • Hao Yuan
  • Guangming Cheng
  • Weizong Xu
  • Weiwei W. Jian
  • Ming-Hao Chuang
  • Chien-Chang Juan
  • An-Chou Yeh
  • Su-Jien Lin

Detail(s)

Original languageEnglish
Pages (from-to)81-86
Journal / PublicationIntermetallics
Volume33
Online published6 Nov 2012
Publication statusPublished - Feb 2013
Externally publishedYes

Abstract

The hardening in Al0.3CrFe1.5MnNi0.5 high-entropy alloy not only nearly triples the hardness of the alloy, but also shows a quick hardening response and the absence of overaging. However, the crystal structure, morphology, and composition of the hardening phase have not yet been confirmed. Here, such information regarding the hardening phase is investigated. It was found that the hardening phase is a Cr-Mn-Fe ternary sigma phase. Unlike in conventional engineering alloys, the sigma phase is not precipitated from the matrix, instead, the whole BCC matrix transforms to sigma phase almost without changing its composition. Therefore, the hardening phenomenon is not a precipitation hardening reaction as suggested before. © 2012 Elsevier Ltd. All rights reserved.

Research Area(s)

  • B. Age-hardening, B. Precipitates, F. Electron microscopy, transmission

Citation Format(s)

Significant hardening due to the formation of a sigma phase matrix in a high entropy alloy. / Tsai, Ming-Hung; Yuan, Hao; Cheng, Guangming; Xu, Weizong; Jian, Weiwei W.; Chuang, Ming-Hao; Juan, Chien-Chang; Yeh, An-Chou; Lin, Su-Jien; Zhu, Yuntian.

In: Intermetallics, Vol. 33, 02.2013, p. 81-86.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review