The Observation of a Cellular Reaction in a Ni 36Co 18Cr 20Fe 19Al 7 High-Entropy Alloy after Quenching and Annealing

21 Pages Posted: 16 Oct 2019

See all articles by Yi-Jyun Lin

Yi-Jyun Lin

National Taiwan University of Science and Technology - Department of Mechanical Engineering

Gurumayum Robert Kenedy

National Taiwan University of Science and Technology - Department of Mechanical Engineering

Wei-Chun Cheng

National Taiwan University of Science and Technology - Department of Mechanical Engineering

Hwo-Shuenn Sheu

National Synchrotron Radiation Research Center - Scientific Research Division

Abstract

High-entropy alloys (HEAs) are composed of three or more elements. The development of HEAs requires knowledge of phase transformations influencing the synthesis techniques. In this paper, phase transformations of a Ni36Co18Cr20Fe19Al7 HEA have been studied. The methodology includes heating to and quenching from 1323 K, followed by isothermal holding at 873 K. Not only coherent fine L12 particles precipitate homogeneously in austenite, but also lamellae of austenite and L12 phase nucleate and grow from the grain boundaries. Subsequently, a cellular reaction occurs and high-temperature austenite transforms into low temperature lamellar austenite and L12 phase, i.e., austenite -> austenite + L12.

Keywords: high-entropy alloy, cellular reaction, L12 phase

Suggested Citation

Lin, Yi-Jyun and Kenedy, Gurumayum Robert and Cheng, Wei-Chun and Sheu, Hwo-Shuenn, The Observation of a Cellular Reaction in a Ni 36Co 18Cr 20Fe 19Al 7 High-Entropy Alloy after Quenching and Annealing. Available at SSRN: https://ssrn.com/abstract=3467763 or http://dx.doi.org/10.2139/ssrn.3467763

Yi-Jyun Lin (Contact Author)

National Taiwan University of Science and Technology - Department of Mechanical Engineering

Taiwan

Gurumayum Robert Kenedy

National Taiwan University of Science and Technology - Department of Mechanical Engineering

Taiwan

Wei-Chun Cheng

National Taiwan University of Science and Technology - Department of Mechanical Engineering ( email )

Taiwan

Hwo-Shuenn Sheu

National Synchrotron Radiation Research Center - Scientific Research Division

Taiwan

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