Coupled Strengthening Effects by Lattice Distortion, Local Chemical Ordering, and Nanoprecipitates in Medium-Entropy Alloys

Extraordinary mechanical properties can be achieved in high-entropy alloys (HEAs) or medium-entropy alloys (MEAs) with nanoprecipitates. In the present study, the extra coupled strengthening effects by lattice distortion, local chemical ordering, and nanoprecipitates in the HEAs and MEAs with nanopr...

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Autores principales:	Wenqiang Cheng, Fuping Yuan, Xiaolei Wu
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	high-entropy alloys lattice distortion local chemical ordering precipitation strengthening mechanisms molecular dynamics simulations Technology T
Acceso en línea:	https://doaj.org/article/fa2e20806d7c4860ad8963bbd018fe22
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spelling	oai:doaj.org-article:fa2e20806d7c4860ad8963bbd018fe222021-11-12T11:31:03ZCoupled Strengthening Effects by Lattice Distortion, Local Chemical Ordering, and Nanoprecipitates in Medium-Entropy Alloys2296-801610.3389/fmats.2021.767795https://doaj.org/article/fa2e20806d7c4860ad8963bbd018fe222021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fmats.2021.767795/fullhttps://doaj.org/toc/2296-8016Extraordinary mechanical properties can be achieved in high-entropy alloys (HEAs) or medium-entropy alloys (MEAs) with nanoprecipitates. In the present study, the extra coupled strengthening effects by lattice distortion, local chemical ordering, and nanoprecipitates in the HEAs and MEAs with nanoprecipitates have been systematically investigated by large-scale molecular dynamics simulations. The moving of the dislocation can be slowed down, and the dislocation line shows a wavy configuration due to lattice distortion and local chemical ordering, resulting in strengthening. The degree of the wavy configuration increases and the sliding velocity of the dislocation decreases with increasing degrees of local chemical ordering. It is clearly indicated that the dislocation moves via nanoscale segment detrapping mechanism due to the effects of lattice distortion and local chemical ordering, resulting in roughened dislocation pathways for strengthening. The activated nanoscale segments are observed to be easier to detrap from the regions with stronger Co-Cr local chemical ordering and then propagate into the regions without such chemical ordering. These moving characteristics of the dislocation can delay the unpinning process from nanoprecipitates; thus, extra coupled strengthening effect has been revealed in the HEAs and MEAs with nanoprecipitates compared to pure Orowan’s strengthening.Wenqiang ChengWenqiang ChengFuping YuanFuping YuanXiaolei WuXiaolei WuFrontiers Media S.A.articlehigh-entropy alloyslattice distortionlocal chemical orderingprecipitationstrengthening mechanismsmolecular dynamics simulationsTechnologyTENFrontiers in Materials, Vol 8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	high-entropy alloys lattice distortion local chemical ordering precipitation strengthening mechanisms molecular dynamics simulations Technology T
spellingShingle	high-entropy alloys lattice distortion local chemical ordering precipitation strengthening mechanisms molecular dynamics simulations Technology T Wenqiang Cheng Wenqiang Cheng Fuping Yuan Fuping Yuan Xiaolei Wu Xiaolei Wu Coupled Strengthening Effects by Lattice Distortion, Local Chemical Ordering, and Nanoprecipitates in Medium-Entropy Alloys
description	Extraordinary mechanical properties can be achieved in high-entropy alloys (HEAs) or medium-entropy alloys (MEAs) with nanoprecipitates. In the present study, the extra coupled strengthening effects by lattice distortion, local chemical ordering, and nanoprecipitates in the HEAs and MEAs with nanoprecipitates have been systematically investigated by large-scale molecular dynamics simulations. The moving of the dislocation can be slowed down, and the dislocation line shows a wavy configuration due to lattice distortion and local chemical ordering, resulting in strengthening. The degree of the wavy configuration increases and the sliding velocity of the dislocation decreases with increasing degrees of local chemical ordering. It is clearly indicated that the dislocation moves via nanoscale segment detrapping mechanism due to the effects of lattice distortion and local chemical ordering, resulting in roughened dislocation pathways for strengthening. The activated nanoscale segments are observed to be easier to detrap from the regions with stronger Co-Cr local chemical ordering and then propagate into the regions without such chemical ordering. These moving characteristics of the dislocation can delay the unpinning process from nanoprecipitates; thus, extra coupled strengthening effect has been revealed in the HEAs and MEAs with nanoprecipitates compared to pure Orowan’s strengthening.
format	article
author	Wenqiang Cheng Wenqiang Cheng Fuping Yuan Fuping Yuan Xiaolei Wu Xiaolei Wu
author_facet	Wenqiang Cheng Wenqiang Cheng Fuping Yuan Fuping Yuan Xiaolei Wu Xiaolei Wu
author_sort	Wenqiang Cheng
title	Coupled Strengthening Effects by Lattice Distortion, Local Chemical Ordering, and Nanoprecipitates in Medium-Entropy Alloys
title_short	Coupled Strengthening Effects by Lattice Distortion, Local Chemical Ordering, and Nanoprecipitates in Medium-Entropy Alloys
title_full	Coupled Strengthening Effects by Lattice Distortion, Local Chemical Ordering, and Nanoprecipitates in Medium-Entropy Alloys
title_fullStr	Coupled Strengthening Effects by Lattice Distortion, Local Chemical Ordering, and Nanoprecipitates in Medium-Entropy Alloys
title_full_unstemmed	Coupled Strengthening Effects by Lattice Distortion, Local Chemical Ordering, and Nanoprecipitates in Medium-Entropy Alloys
title_sort	coupled strengthening effects by lattice distortion, local chemical ordering, and nanoprecipitates in medium-entropy alloys
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/fa2e20806d7c4860ad8963bbd018fe22
work_keys_str_mv	AT wenqiangcheng coupledstrengtheningeffectsbylatticedistortionlocalchemicalorderingandnanoprecipitatesinmediumentropyalloys AT wenqiangcheng coupledstrengtheningeffectsbylatticedistortionlocalchemicalorderingandnanoprecipitatesinmediumentropyalloys AT fupingyuan coupledstrengtheningeffectsbylatticedistortionlocalchemicalorderingandnanoprecipitatesinmediumentropyalloys AT fupingyuan coupledstrengtheningeffectsbylatticedistortionlocalchemicalorderingandnanoprecipitatesinmediumentropyalloys AT xiaoleiwu coupledstrengtheningeffectsbylatticedistortionlocalchemicalorderingandnanoprecipitatesinmediumentropyalloys AT xiaoleiwu coupledstrengtheningeffectsbylatticedistortionlocalchemicalorderingandnanoprecipitatesinmediumentropyalloys
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Coupled Strengthening Effects by Lattice Distortion, Local Chemical Ordering, and Nanoprecipitates in Medium-Entropy Alloys

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