High temperature oxidation of non equi-atomic Al5Cr12Fe35Mn28Ni20 high entropy alloy | Zendy

Mayar M. Ali | Zendy; Sanaa S. Abd ElMoamen | Zendy; Lamiaa Z. Mohamed | Zendy; H. A. Ahmed | Zendy; F. A. Elrefaie | Zendy

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High temperature oxidation of non equi-atomic Al5Cr12Fe35Mn28Ni20 high entropy alloy

Author(s) -

Mayar M. Ali,

Sanaa S. Abd ElMoamen,

Lamiaa Z. Mohamed,

H. A. Ahmed,

F. A. Elrefaie

Publication year - 2021

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/abeab9

Subject(s) - alloy , spinel , isothermal process , materials science , manganese , oxide , activation energy , kinetics , analytical chemistry (journal) , metallurgy , thermodynamics , chemistry , physics , chromatography , quantum mechanics

The Oxidation behavior of the Al 5 Cr 12 Fe 35 Mn 28 Ni 20 high entropy alloy was investigated in air at temperatures 900 °C, 1000 °C and 1100 °C for 100 h isothermally. The oxidation kinetics at all temperatures obeys the parabolic rate law with an activation energy 100.6 kJ mol −1 . The alloy was externally oxidized forming duplex layer consisted of manganese oxides that overlays Mn-Cr-Fe spinel oxides. While, it was observed that at 1000 °C and 1100 °C the samples were also oxidized internally forming Al 2 O 3 deep in the alloy. The initial oxidation behavior of the alloy oxidized at 1000 °C for 1 and 24 h producing external scale of Mn 3 O 4 overlaying Mn-Cr-Fe spinel oxide and Al 2 O 3 precipitates.

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