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Activation Energy and High Temperature Oxidation Behavior of Multi‐Principal Element Alloy
Author(s) -
Grewal Harpreet Singh,
Sanjiv Ramachandran Murali,
Arora Harpreet Singh,
Kumar Ram,
Ayyagari Aditya,
Mukherjee Sundeep,
Singh Harpreet
Publication year - 2017
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201700182
Subject(s) - materials science , activation energy , alloy , diffusion , kinetics , lattice diffusion coefficient , high entropy alloys , thermodynamics , metallurgy , kinetic energy , chemical engineering , chemistry , effective diffusion coefficient , medicine , physics , radiology , quantum mechanics , magnetic resonance imaging , engineering
Activation energy and diffusion kinetics are important in modulating the high temperature oxidation behavior of metals. Recently developed multi‐principal element alloys, also called high entropy alloys (HEAs), are promising candidate material for high temperature applications. However, the activation energies and diffusion kinetics of HEAs have been limitedly explored. We investigate the diffusional activation energy for oxidation of Al 0.1 CoCrFeNi HEA. Compared to conventional steels and Ni‐based super alloys, the HEA showed a significantly higher diffusion activation energy. This behavior is explained based on low potential energy of the lattice and interstitial sites which effectively trap the atoms, limiting their diffusion. The atomic mean jump frequency for interstitial diffusion of oxygen in the HEA is four‐orders of magnitude lower than T22 and T91 steels and seven‐orders of magnitude lower compared to pure iron. Al 0.1 CoCrFeNi HEA showed the lowest oxidation rate compared to conventionally used steels, super‐alloys, and coatings.