Developing superplasticity in high-entropy alloys processed by severe plastic deformation
Developing superplasticity in high-entropy alloys processed by severe plastic deformation
High-entropy alloys (HEAs) are currently attracting much interest because they offer unique properties and good ductility at low temperatures. These materials are of interest primarily because they contain five or more principal elements, with each element having a concentration between 5 and 35 at. %, and yet they have very simple structures based on solid solution phases. Superplasticity is defined formally as a tensile elongation without failure of at least 400% and very recent experiments have shown that the HEAs also have a potential for exhibiting superplastic ductilities when testing at elevated temperatures. Since superplasticity requires a very small grain size, typically <10 µm, it is feasible to process HEAs using severe plastic deformation in order to introduce significant grain refinement. The objective of this review is to summarize the recent results showing superplasticity in HEAs and to compare directly the superplastic flow in HEAs and superplasticity in conventional metallic alloys.
CoCrFeNiMn Alloy, High-Entropy Alloys, Severe Plastic Deformation, Superplasticity, Ultrafine Grains.
1059-1064
Shahmir, Hamed
9d330616-d35d-4db0-96e8-26195ae1c511
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
December 2018
Shahmir, Hamed
9d330616-d35d-4db0-96e8-26195ae1c511
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Shahmir, Hamed, Kawasaki, Megumi and Langdon, Terence G.
(2018)
Developing superplasticity in high-entropy alloys processed by severe plastic deformation.
Materials Science Forum, 941, .
(doi:10.4028/www.scientific.net/MSF.941.1059).
Abstract
High-entropy alloys (HEAs) are currently attracting much interest because they offer unique properties and good ductility at low temperatures. These materials are of interest primarily because they contain five or more principal elements, with each element having a concentration between 5 and 35 at. %, and yet they have very simple structures based on solid solution phases. Superplasticity is defined formally as a tensile elongation without failure of at least 400% and very recent experiments have shown that the HEAs also have a potential for exhibiting superplastic ductilities when testing at elevated temperatures. Since superplasticity requires a very small grain size, typically <10 µm, it is feasible to process HEAs using severe plastic deformation in order to introduce significant grain refinement. The objective of this review is to summarize the recent results showing superplasticity in HEAs and to compare directly the superplastic flow in HEAs and superplasticity in conventional metallic alloys.
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Langdon-THERMEC-2018
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e-pub ahead of print date: 26 December 2018
Published date: December 2018
Keywords:
CoCrFeNiMn Alloy, High-Entropy Alloys, Severe Plastic Deformation, Superplasticity, Ultrafine Grains.
Identifiers
Local EPrints ID: 430499
URI: http://eprints.soton.ac.uk/id/eprint/430499
ISSN: 1662-9752
PURE UUID: d859cf9d-54d7-48ba-a6b8-de296bcef6c9
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Date deposited: 02 May 2019 16:30
Last modified: 16 Mar 2024 03:28
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Author:
Hamed Shahmir
Author:
Megumi Kawasaki
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