Ordering-mediated local nano-clustering results in unusually large Hall-Petch strengthening coefficients in high entropy alloys

This paper reports a dramatic increase in the grain boundary strengthening or Hall-Petch coefficient, K, by systematically investigating the effect of Al addition on tensile yield strength in CoFeNi and CoCrFeNi high entropy alloys (HEAs) or complex concentrated alloys (CCAs). Additionally, detailed...

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Main Authors:	A. Jagetia, M.S.K.K.Y. Nartu, S. Dasari, A. Sharma, B. Gwalani, R. Banerjee
Format:	Article
Language:	English
Published:	Taylor & Francis Group 2021-05-01
Series:	Materials Research Letters
Subjects:	hall-petch strengthening high entropy alloys complex concentrated alloys clustering ordering
Online Access:	http://dx.doi.org/10.1080/21663831.2020.1871440

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spelling	doaj-9382b27e735c4e20b44ca0eea2ee43432021-03-02T14:23:41ZengTaylor & Francis GroupMaterials Research Letters2166-38312021-05-019521322210.1080/21663831.2020.18714401871440Ordering-mediated local nano-clustering results in unusually large Hall-Petch strengthening coefficients in high entropy alloysA. Jagetia0M.S.K.K.Y. Nartu1S. Dasari2A. Sharma3B. Gwalani4R. Banerjee5University of North TexasUniversity of North TexasUniversity of North TexasUniversity of North TexasUniversity of North TexasUniversity of North TexasThis paper reports a dramatic increase in the grain boundary strengthening or Hall-Petch coefficient, K, by systematically investigating the effect of Al addition on tensile yield strength in CoFeNi and CoCrFeNi high entropy alloys (HEAs) or complex concentrated alloys (CCAs). Additionally, detailed atom probe tomography (APT) revealed a high number density of Ni-Al rich nano-clusters in the Al0.3CoFeNi and Al0.3CoCrFeNi HEAs/CCAs, which can be rationalized based on the strong chemical ordering tendency between these elements. Consequently, the huge increase in K value can be attributed to the additional stress required for overcoming coherency strain fields arising from these nano-clusters.http://dx.doi.org/10.1080/21663831.2020.1871440hall-petch strengtheninghigh entropy alloyscomplex concentrated alloysclusteringordering
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	A. Jagetia M.S.K.K.Y. Nartu S. Dasari A. Sharma B. Gwalani R. Banerjee
spellingShingle	A. Jagetia M.S.K.K.Y. Nartu S. Dasari A. Sharma B. Gwalani R. Banerjee Ordering-mediated local nano-clustering results in unusually large Hall-Petch strengthening coefficients in high entropy alloys Materials Research Letters hall-petch strengthening high entropy alloys complex concentrated alloys clustering ordering
author_facet	A. Jagetia M.S.K.K.Y. Nartu S. Dasari A. Sharma B. Gwalani R. Banerjee
author_sort	A. Jagetia
title	Ordering-mediated local nano-clustering results in unusually large Hall-Petch strengthening coefficients in high entropy alloys
title_short	Ordering-mediated local nano-clustering results in unusually large Hall-Petch strengthening coefficients in high entropy alloys
title_full	Ordering-mediated local nano-clustering results in unusually large Hall-Petch strengthening coefficients in high entropy alloys
title_fullStr	Ordering-mediated local nano-clustering results in unusually large Hall-Petch strengthening coefficients in high entropy alloys
title_full_unstemmed	Ordering-mediated local nano-clustering results in unusually large Hall-Petch strengthening coefficients in high entropy alloys
title_sort	ordering-mediated local nano-clustering results in unusually large hall-petch strengthening coefficients in high entropy alloys
publisher	Taylor & Francis Group
series	Materials Research Letters
issn	2166-3831
publishDate	2021-05-01
description	This paper reports a dramatic increase in the grain boundary strengthening or Hall-Petch coefficient, K, by systematically investigating the effect of Al addition on tensile yield strength in CoFeNi and CoCrFeNi high entropy alloys (HEAs) or complex concentrated alloys (CCAs). Additionally, detailed atom probe tomography (APT) revealed a high number density of Ni-Al rich nano-clusters in the Al0.3CoFeNi and Al0.3CoCrFeNi HEAs/CCAs, which can be rationalized based on the strong chemical ordering tendency between these elements. Consequently, the huge increase in K value can be attributed to the additional stress required for overcoming coherency strain fields arising from these nano-clusters.
topic	hall-petch strengthening high entropy alloys complex concentrated alloys clustering ordering
url	http://dx.doi.org/10.1080/21663831.2020.1871440
work_keys_str_mv	AT ajagetia orderingmediatedlocalnanoclusteringresultsinunusuallylargehallpetchstrengtheningcoefficientsinhighentropyalloys AT mskkynartu orderingmediatedlocalnanoclusteringresultsinunusuallylargehallpetchstrengtheningcoefficientsinhighentropyalloys AT sdasari orderingmediatedlocalnanoclusteringresultsinunusuallylargehallpetchstrengtheningcoefficientsinhighentropyalloys AT asharma orderingmediatedlocalnanoclusteringresultsinunusuallylargehallpetchstrengtheningcoefficientsinhighentropyalloys AT bgwalani orderingmediatedlocalnanoclusteringresultsinunusuallylargehallpetchstrengtheningcoefficientsinhighentropyalloys AT rbanerjee orderingmediatedlocalnanoclusteringresultsinunusuallylargehallpetchstrengtheningcoefficientsinhighentropyalloys
_version_	1724235020926713856

Ordering-mediated local nano-clustering results in unusually large Hall-Petch strengthening coefficients in high entropy alloys

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