Abnormal γ″ - ε phase transformation in the CoCrFeNiNb0.25 high entropy alloy

Feng He; Zhijun Wang; Jing Wang; Qingfeng Wu; Da Chen; Bin Han; Junjie Li; Jincheng Wang; J. J. Kai

doi:10.1016/j.scriptamat.2017.12.009

Abnormal γ″ - ε phase transformation in the CoCrFeNiNb_0.25 high entropy alloy

Feng He, Zhijun Wang, Jing Wang, Qingfeng Wu, Da Chen, Bin Han, Junjie Li, Jincheng Wang, J. J. Kai

School of Materials Sience and Engineering

Research output: Contribution to journal › Article › peer-review

49 Scopus citations

Abstract

Thermodynamically, the multi-principal-component compositions of high entropy alloys (HEAs) bring diversified phase transformation paths. In this study, we report that a γ″ phase precipitates from the face centered cubic (FCC) matrix and then abnormally transforms into a ε phase, instead of the δ phase as reported in superalloys. The ε phase has a (NiCo)₃Nb-type hexagonal crystal structure. The phase transformation takes places in a manner of peritectoid reaction: γ″ + FCC → ε. The present findings indicate a high probability for researchers to find new efficient strengthening phases as well as interesting phase transformation mechanism in HEAs.

Original language	English
Pages (from-to)	281-285
Number of pages	5
Journal	Scripta Materialia
Volume	146
DOIs	https://doi.org/10.1016/j.scriptamat.2017.12.009
State	Published - 15 Mar 2018

Keywords

High entropy alloys
Phase transformation
Precipitation

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10.1016/j.scriptamat.2017.12.009

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title = "Abnormal γ″ - ε phase transformation in the CoCrFeNiNb0.25 high entropy alloy",

abstract = "Thermodynamically, the multi-principal-component compositions of high entropy alloys (HEAs) bring diversified phase transformation paths. In this study, we report that a γ″ phase precipitates from the face centered cubic (FCC) matrix and then abnormally transforms into a ε phase, instead of the δ phase as reported in superalloys. The ε phase has a (NiCo)3Nb-type hexagonal crystal structure. The phase transformation takes places in a manner of peritectoid reaction: γ″ + FCC → ε. The present findings indicate a high probability for researchers to find new efficient strengthening phases as well as interesting phase transformation mechanism in HEAs.",

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author = "Feng He and Zhijun Wang and Jing Wang and Qingfeng Wu and Da Chen and Bin Han and Junjie Li and Jincheng Wang and Kai, {J. J.}",

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T1 - Abnormal γ″ - ε phase transformation in the CoCrFeNiNb0.25 high entropy alloy

AU - He, Feng

AU - Wang, Zhijun

AU - Wang, Jing

AU - Wu, Qingfeng

AU - Chen, Da

AU - Han, Bin

AU - Li, Junjie

AU - Wang, Jincheng

AU - Kai, J. J.

PY - 2018/3/15

Y1 - 2018/3/15

N2 - Thermodynamically, the multi-principal-component compositions of high entropy alloys (HEAs) bring diversified phase transformation paths. In this study, we report that a γ″ phase precipitates from the face centered cubic (FCC) matrix and then abnormally transforms into a ε phase, instead of the δ phase as reported in superalloys. The ε phase has a (NiCo)3Nb-type hexagonal crystal structure. The phase transformation takes places in a manner of peritectoid reaction: γ″ + FCC → ε. The present findings indicate a high probability for researchers to find new efficient strengthening phases as well as interesting phase transformation mechanism in HEAs.

AB - Thermodynamically, the multi-principal-component compositions of high entropy alloys (HEAs) bring diversified phase transformation paths. In this study, we report that a γ″ phase precipitates from the face centered cubic (FCC) matrix and then abnormally transforms into a ε phase, instead of the δ phase as reported in superalloys. The ε phase has a (NiCo)3Nb-type hexagonal crystal structure. The phase transformation takes places in a manner of peritectoid reaction: γ″ + FCC → ε. The present findings indicate a high probability for researchers to find new efficient strengthening phases as well as interesting phase transformation mechanism in HEAs.

KW - High entropy alloys

KW - Phase transformation

KW - Precipitation

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DO - 10.1016/j.scriptamat.2017.12.009

M3 - 文章

AN - SCOPUS:85037974359

SN - 1359-6462

VL - 146

SP - 281

EP - 285

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Abnormal γ″ - ε phase transformation in the CoCrFeNiNb_0.25 high entropy alloy

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