AlNiCrFeMn Equiatomic High Entropy Alloy: A Further Insight in Its Microstructural Evolution, Mechanical and Surface Degradation Response

The microstructure and properties of an equiatomic AlCrFeMnNi high entropy alloy (HEA) in the as-cast condition are presented. The microstructure consists of two phases (NiAl-rich B2 and FeCr-rich A2) featuring various eutectic morphologies, ranging from regular to anomalous development. Solidificat...

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Bibliographic Details
Published inMetals and materials international Vol. 26; no. 6; pp. 793 - 811
Main Authors Ananiadis, E., Lentzaris, K., Georgatis, E., Mathiou, C., Poulia, A., Karantzalis, A. E.
Format Journal Article
LanguageEnglish
Published Seoul The Korean Institute of Metals and Materials 01.06.2020
Springer Nature B.V
대한금속·재료학회
Subjects
Characterization and Evaluation of Materials
Chemistry and Materials Science
Elongation
Engineering Thermodynamics
Fracture surfaces
Frictional wear
Heat and Mass Transfer
High entropy alloys
High temperature
Machines
Magnetic Materials
Magnetism
Manufacturing
Materials Science
Metallic Materials
Microstructure
Modulus of elasticity
Morphology
Nickel aluminides
Nickel base alloys
Nickel compounds
Oxidation tests
Processes
Reaction kinetics
Sliding friction
Solid Mechanics
Solidification
Supercooling
Yield point
재료공학
High entropy alloys
Compression
Oxidation
Sliding wear
Microstructure
Solidification
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Summary:The microstructure and properties of an equiatomic AlCrFeMnNi high entropy alloy (HEA) in the as-cast condition are presented. The microstructure consists of two phases (NiAl-rich B2 and FeCr-rich A2) featuring various eutectic morphologies, ranging from regular to anomalous development. Solidification phenomena (undercooling and recalescense) are used in order to assess the various morphological features along with theories of anomalous eutectic growth. Sliding wear testing shows an oxidation-delamination mode of material removal along with some partial abrasive mode character. Modulus of elasticity and yield point are significantly high and elongation presents at a satisfying level, whereas fracture surface examination reveals the characteristics of a brittle fracture mode. High temperature oxidation tests show multiple oxidation phenomena of different kinetics, formed oxide phases and material deterioration phenomena. Graphic Abstract
ISSN:1598-9623
2005-4149
DOI:10.1007/s12540-019-00401-4