Phase separation of metastable CoCrFeNi high entropy alloy at intermediate temperatures

Feng He; Zhijun Wang; Qingfeng Wu; Junjie Li; Jincheng Wang; C. T. Liu

doi:10.1016/j.scriptamat.2016.08.008

Phase separation of metastable CoCrFeNi high entropy alloy at intermediate temperatures

Feng He, Zhijun Wang, Qingfeng Wu, Junjie Li, Jincheng Wang, C. T. Liu

School of Materials Sience and Engineering

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

236 Scopus citations

Abstract

CoCrFeNi alloy is an exemplary stable base for high entropy alloys (HEAs), but its phase stability is still suspicious. Here, the CoCrFeNi HEA was firstly identified to be thermally metastable at 750 °C. Composition decomposition occurred after annealed at 750 °C for 800 h. The minor addition of Al accelerated the composition decomposition and a second fcc phase with a different lattice constant occurred in the long time annealed CoCrFeNiAl_0.1 HEA. The CoCrFeNi HEA cannot be seen as stable alloys anymore and researchers should be very careful when using the current phase selection models to predict stability of HEAs at intermediate temperatures.

Original language	English
Pages (from-to)	15-19
Number of pages	5
Journal	Scripta Materialia
Volume	126
DOIs	https://doi.org/10.1016/j.scriptamat.2016.08.008
State	Published - 1 Jan 2017

Keywords

Annealing
High entropy alloys
Phase separation

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title = "Phase separation of metastable CoCrFeNi high entropy alloy at intermediate temperatures",

abstract = "CoCrFeNi alloy is an exemplary stable base for high entropy alloys (HEAs), but its phase stability is still suspicious. Here, the CoCrFeNi HEA was firstly identified to be thermally metastable at 750 °C. Composition decomposition occurred after annealed at 750 °C for 800 h. The minor addition of Al accelerated the composition decomposition and a second fcc phase with a different lattice constant occurred in the long time annealed CoCrFeNiAl0.1 HEA. The CoCrFeNi HEA cannot be seen as stable alloys anymore and researchers should be very careful when using the current phase selection models to predict stability of HEAs at intermediate temperatures.",

keywords = "Annealing, High entropy alloys, Phase separation",

author = "Feng He and Zhijun Wang and Qingfeng Wu and Junjie Li and Jincheng Wang and Liu, {C. T.}",

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doi = "10.1016/j.scriptamat.2016.08.008",

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T1 - Phase separation of metastable CoCrFeNi high entropy alloy at intermediate temperatures

AU - He, Feng

AU - Wang, Zhijun

AU - Wu, Qingfeng

AU - Li, Junjie

AU - Wang, Jincheng

AU - Liu, C. T.

PY - 2017/1/1

Y1 - 2017/1/1

N2 - CoCrFeNi alloy is an exemplary stable base for high entropy alloys (HEAs), but its phase stability is still suspicious. Here, the CoCrFeNi HEA was firstly identified to be thermally metastable at 750 °C. Composition decomposition occurred after annealed at 750 °C for 800 h. The minor addition of Al accelerated the composition decomposition and a second fcc phase with a different lattice constant occurred in the long time annealed CoCrFeNiAl0.1 HEA. The CoCrFeNi HEA cannot be seen as stable alloys anymore and researchers should be very careful when using the current phase selection models to predict stability of HEAs at intermediate temperatures.

AB - CoCrFeNi alloy is an exemplary stable base for high entropy alloys (HEAs), but its phase stability is still suspicious. Here, the CoCrFeNi HEA was firstly identified to be thermally metastable at 750 °C. Composition decomposition occurred after annealed at 750 °C for 800 h. The minor addition of Al accelerated the composition decomposition and a second fcc phase with a different lattice constant occurred in the long time annealed CoCrFeNiAl0.1 HEA. The CoCrFeNi HEA cannot be seen as stable alloys anymore and researchers should be very careful when using the current phase selection models to predict stability of HEAs at intermediate temperatures.

KW - Annealing

KW - High entropy alloys

KW - Phase separation

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DO - 10.1016/j.scriptamat.2016.08.008

M3 - 文章

AN - SCOPUS:84982305871

SN - 1359-6462

VL - 126

SP - 15

EP - 19

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Phase separation of metastable CoCrFeNi high entropy alloy at intermediate temperatures

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Keywords

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