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Short-range order and its impact on the CrCoNi medium-entropy alloy
Traditional metallic alloys are mixtures of elements in which the atoms of minority species tend to be distributed randomly if they are below their solubility limit, or to form secondary phases if they are above it. The concept of multiple-principal-element alloys has recently expanded this view, as...
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Published in: | Nature (London) 2020-05, Vol.581 (7808), p.283-287 |
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description | Traditional metallic alloys are mixtures of elements in which the atoms of minority species tend to be distributed randomly if they are below their solubility limit, or to form secondary phases if they are above it. The concept of multiple-principal-element alloys has recently expanded this view, as these materials are single-phase solid solutions of generally equiatomic mixtures of metallic elements. This group of materials has received much interest owing to their enhanced mechanical properties
1
–
5
. They are usually called medium-entropy alloys in ternary systems and high-entropy alloys in quaternary or quinary systems, alluding to their high degree of configurational entropy. However, the question has remained as to how random these solid solutions actually are, with the influence of short-range order being suggested in computational simulations but not seen experimentally
6
,
7
. Here we report the observation, using energy-filtered transmission electron microscopy, of structural features attributable to short-range order in the CrCoNi medium-entropy alloy. Increasing amounts of such order give rise to both higher stacking-fault energy and hardness. These findings suggest that the degree of local ordering at the nanometre scale can be tailored through thermomechanical processing, providing a new avenue for tuning the mechanical properties of medium- and high-entropy alloys.
Metal alloys consisting of three or more major elemental components show enhanced mechanical properties, which are now shown to be correlated with short-range order observed with electron microscopy. |
doi_str_mv | 10.1038/s41586-020-2275-z |
format | article |
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1
–
5
. They are usually called medium-entropy alloys in ternary systems and high-entropy alloys in quaternary or quinary systems, alluding to their high degree of configurational entropy. However, the question has remained as to how random these solid solutions actually are, with the influence of short-range order being suggested in computational simulations but not seen experimentally
6
,
7
. Here we report the observation, using energy-filtered transmission electron microscopy, of structural features attributable to short-range order in the CrCoNi medium-entropy alloy. Increasing amounts of such order give rise to both higher stacking-fault energy and hardness. These findings suggest that the degree of local ordering at the nanometre scale can be tailored through thermomechanical processing, providing a new avenue for tuning the mechanical properties of medium- and high-entropy alloys.
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1
–
5
. They are usually called medium-entropy alloys in ternary systems and high-entropy alloys in quaternary or quinary systems, alluding to their high degree of configurational entropy. However, the question has remained as to how random these solid solutions actually are, with the influence of short-range order being suggested in computational simulations but not seen experimentally
6
,
7
. Here we report the observation, using energy-filtered transmission electron microscopy, of structural features attributable to short-range order in the CrCoNi medium-entropy alloy. Increasing amounts of such order give rise to both higher stacking-fault energy and hardness. These findings suggest that the degree of local ordering at the nanometre scale can be tailored through thermomechanical processing, providing a new avenue for tuning the mechanical properties of medium- and high-entropy alloys.
Metal alloys consisting of three or more major elemental components show enhanced mechanical properties, which are now shown to be correlated with short-range order observed with electron microscopy.</description><subject>639/301/1023/1026</subject><subject>639/301/930/328/2082</subject><subject>Alloy systems</subject><subject>Alloying elements</subject><subject>Alloys</subject><subject>Atomic structure</subject><subject>Computer applications</subject><subject>Computer simulation</subject><subject>Electron microscopy</subject><subject>Electronic structure</subject><subject>Energy</subject><subject>energy-filtered transmission electron microscopy</subject><subject>Entropy</subject><subject>Entropy (Physics)</subject><subject>Fourier transforms</subject><subject>Heat resistant alloys</subject><subject>High entropy alloys</subject><subject>Humanities and Social Sciences</subject><subject>Influence</subject><subject>MATERIALS 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(LBNL), Berkeley, CA (United States)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Short-range order and its impact on the CrCoNi medium-entropy alloy</atitle><jtitle>Nature (London)</jtitle><stitle>Nature</stitle><addtitle>Nature</addtitle><date>2020-05-01</date><risdate>2020</risdate><volume>581</volume><issue>7808</issue><spage>283</spage><epage>287</epage><pages>283-287</pages><issn>0028-0836</issn><eissn>1476-4687</eissn><abstract>Traditional metallic alloys are mixtures of elements in which the atoms of minority species tend to be distributed randomly if they are below their solubility limit, or to form secondary phases if they are above it. The concept of multiple-principal-element alloys has recently expanded this view, as these materials are single-phase solid solutions of generally equiatomic mixtures of metallic elements. This group of materials has received much interest owing to their enhanced mechanical properties
1
–
5
. They are usually called medium-entropy alloys in ternary systems and high-entropy alloys in quaternary or quinary systems, alluding to their high degree of configurational entropy. However, the question has remained as to how random these solid solutions actually are, with the influence of short-range order being suggested in computational simulations but not seen experimentally
6
,
7
. Here we report the observation, using energy-filtered transmission electron microscopy, of structural features attributable to short-range order in the CrCoNi medium-entropy alloy. Increasing amounts of such order give rise to both higher stacking-fault energy and hardness. These findings suggest that the degree of local ordering at the nanometre scale can be tailored through thermomechanical processing, providing a new avenue for tuning the mechanical properties of medium- and high-entropy alloys.
Metal alloys consisting of three or more major elemental components show enhanced mechanical properties, which are now shown to be correlated with short-range order observed with electron microscopy.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><pmid>32433617</pmid><doi>10.1038/s41586-020-2275-z</doi><tpages>5</tpages><orcidid>https://orcid.org/0000-0002-0501-6998</orcidid><orcidid>https://orcid.org/0000-0003-3606-8309</orcidid><orcidid>https://orcid.org/0000-0001-7677-4051</orcidid><orcidid>https://orcid.org/0000-0002-8968-321X</orcidid><orcidid>https://orcid.org/0000000205016998</orcidid><orcidid>https://orcid.org/0000000336068309</orcidid><orcidid>https://orcid.org/0000000176774051</orcidid><orcidid>https://orcid.org/000000028968321X</orcidid><oa>free_for_read</oa></addata></record> |
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issn | 0028-0836 1476-4687 |
language | eng |
recordid | cdi_osti_scitechconnect_1635190 |
source | Nature |
subjects | 639/301/1023/1026 639/301/930/328/2082 Alloy systems Alloying elements Alloys Atomic structure Computer applications Computer simulation Electron microscopy Electronic structure Energy energy-filtered transmission electron microscopy Entropy Entropy (Physics) Fourier transforms Heat resistant alloys High entropy alloys Humanities and Social Sciences Influence MATERIALS SCIENCE Measurement Mechanical properties Medium entropy alloys medium-/high-entropy alloys metals and alloys multidisciplinary Observations Quinary systems Science Science (multidisciplinary) Short range order Solid solutions Solubility Stacking fault energy Ternary systems Thermal properties Thermomechanical treatment Transmission electron microscopy |
title | Short-range order and its impact on the CrCoNi medium-entropy alloy |
url | http://sfxeu10.hosted.exlibrisgroup.com/loughborough?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-01-02T13%3A32%3A53IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-gale_osti_&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Short-range%20order%20and%20its%20impact%20on%20the%20CrCoNi%20medium-entropy%20alloy&rft.jtitle=Nature%20(London)&rft.au=Zhang,%20Ruopeng&rft.aucorp=Lawrence%20Berkeley%20National%20Lab.%20(LBNL),%20Berkeley,%20CA%20(United%20States)&rft.date=2020-05-01&rft.volume=581&rft.issue=7808&rft.spage=283&rft.epage=287&rft.pages=283-287&rft.issn=0028-0836&rft.eissn=1476-4687&rft_id=info:doi/10.1038/s41586-020-2275-z&rft_dat=%3Cgale_osti_%3EA624538858%3C/gale_osti_%3E%3Cgrp_id%3Ecdi_FETCH-LOGICAL-c601t-aa524d23eab6411b97328b816178f2ce83909749b82ed78ae0e2f368ad988ab13%3C/grp_id%3E%3Coa%3E%3C/oa%3E%3Curl%3E%3C/url%3E&rft_id=info:oai/&rft_pqid=2406986662&rft_id=info:pmid/32433617&rft_galeid=A624538858&rfr_iscdi=true |