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Modulating the prestrain history to optimize strength and ductility in CoCrFeMnNi high-entropy alloy
Chinese Acad Sci, Inst Met Res, Mat Fatigue & Fracture Div, Shenyang 110016, Liaoning, Peoples R China.;Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China..
Northeastern Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Anisotropy & Texture Mat, Shenyang 110819, Liaoning, Peoples R China..
Chinese Acad Sci, Inst Met Res, Mat Fatigue & Fracture Div, Shenyang 110016, Liaoning, Peoples R China.;Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China..
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.ORCID iD: 0000-0001-6482-1404
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2019 (English)In: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 163, p. 111-115Article in journal (Refereed) Published
Abstract [en]

CoCrFeMnNi high-entropy alloy (HEA) exhibits excellent combination of strength and ductility, but low yield strength. In order to ameliorate the mechanical properties, prestrain was applied in this work. The HEA prestrained at 77 K possesses higher yield strength and uniform elongation than the HEA prestrained at 293 K, indicating that the trade-off relationship between strength and ductility can be broken by modulating the prestrain history. Furthermore, the yield point phenomenon was disappeared after prestrained at 77 K. This can be related to the density and distribution of dislocations as imposed in the prestrain process at 293 K and 77 K.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 163, p. 111-115
Keywords [en]
High-entropy alloy, Prestrain, Temperature, Yield strength, Elongation
National Category
Composite Science and Engineering
Identifiers
URN: urn:nbn:se:kth:diva-245890DOI: 10.1016/j.scriptamat.2019.01.012ISI: 000458940000023Scopus ID: 2-s2.0-85059938045OAI: oai:DiVA.org:kth-245890DiVA, id: diva2:1295234
Note

QC 20190811

Available from: 2019-03-11 Created: 2019-03-11 Last updated: 2019-03-11Bibliographically approved

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Lu, Song

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