Open AccessOxidation study of CoCrCuFeNiSix high entropy alloys
Author(s) -
Shajahan Shaik,
Anil Kumar,
Manoj Chopkar,
A. Basu
Publication year - 2020
Publication title -
materials research express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 35
ISSN - 2053-1591
DOI - 10.1088/2053-1591/ab640a
Subject(s) - alloy , kinetics , isothermal process , arrhenius equation , high entropy alloys , materials science , oxide , activation energy , silicon , analytical chemistry (journal) , metallurgy , thermodynamics , chemistry , physics , quantum mechanics , chromatography
Oxidation studies of Co–Cr–Cu–Fe–Ni–Si X=(0,0.3,0.6,0.9) high entropy alloys (HEA) at 600, 700 and 800 °C for 30 h are performed in the present work. Isothermal oxidation confirmed that the oxidation resistance of Co–Cr–Cu–Fe–Ni–Si X=(0,0.3,0.6,0.9 ) high entropy alloy increases with Silicon (Si) content up to 0.6%, beyond that it decreases. Oxidation rate kinetics study of all the alloys at the three designated test temperature represented the typical cubic curve. X-ray diffraction (XRD) analysis revealed the evolution of Cu oxide (CuO) along with existing phases in all the HEA samples. Microstructural observation after oxidation test exhibited an increase in oxide formation with the oxidation temperature. To comprehend the kinetics of oxidation more clearly, Arrhenius plots were drawn for all the HEA samples and activation energies are calculated.