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

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

doi:10.1016/j.intermet.2012.09.022

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

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

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

171 Citations (Scopus)

Abstract

The hardening in Al_0.3CrFe_1.5MnNi_0.5 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.

Original language	English
Pages (from-to)	81-86
Journal	Intermetallics
Volume	33
Online published	6 Nov 2012
DOIs	https://doi.org/10.1016/j.intermet.2012.09.022
Publication status	Published - Feb 2013
Externally published	Yes

Research Keywords

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

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10.1016/j.intermet.2012.09.022

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title = "Significant hardening due to the formation of a sigma phase matrix in a high entropy alloy",

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. {\textcopyright} 2012 Elsevier Ltd. All rights reserved.",

keywords = "B. Age-hardening, B. Precipitates, F. Electron microscopy, transmission, B. Age-hardening, B. Precipitates, F. Electron microscopy, transmission, B. Age-hardening, B. Precipitates, F. Electron microscopy, transmission",

author = "Ming-Hung Tsai and Hao Yuan and Guangming Cheng and Weizong Xu and Jian, {Weiwei W.} and Ming-Hao Chuang and Chien-Chang Juan and An-Chou Yeh and Su-Jien Lin and Yuntian Zhu",

year = "2013",

month = feb,

doi = "10.1016/j.intermet.2012.09.022",

language = "English",

volume = "33",

pages = "81--86",

journal = "Intermetallics",

issn = "0966-9795",

publisher = "Elsevier Ltd.",

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TY - JOUR

T1 - Significant hardening due to the formation of a sigma phase matrix in a high entropy alloy

AU - Tsai, Ming-Hung

AU - Yuan, Hao

AU - Cheng, Guangming

AU - Xu, Weizong

AU - Jian, Weiwei W.

AU - Chuang, Ming-Hao

AU - Juan, Chien-Chang

AU - Yeh, An-Chou

AU - Lin, Su-Jien

AU - Zhu, Yuntian

PY - 2013/2

Y1 - 2013/2

N2 - 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.

AB - 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.

KW - B. Age-hardening

KW - B. Precipitates

KW - F. Electron microscopy, transmission

KW - B. Age-hardening

KW - B. Precipitates

KW - F. Electron microscopy, transmission

KW - B. Age-hardening

KW - B. Precipitates

KW - F. Electron microscopy, transmission

UR - http://www.scopus.com/inward/record.url?scp=84870289562&partnerID=8YFLogxK

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-84870289562&origin=recordpage

U2 - 10.1016/j.intermet.2012.09.022

DO - 10.1016/j.intermet.2012.09.022

M3 - RGC 21 - Publication in refereed journal

SN - 0966-9795

VL - 33

SP - 81

EP - 86

JO - Intermetallics

JF - Intermetallics

ER -

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

Abstract

Research Keywords

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