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Critical stress for twinning nucleation in CrCoNi-based medium and high entropy alloys
Royal Inst Technol, Dept Mat Sci & Engn, Appl Mat Phys, SE-10044 Stockholm, Sweden;Sci & Technol Surface Phys & Chem Lab, Mianyang 621900, Peoples R China.
Royal Inst Technol, Dept Mat Sci & Engn, Appl Mat Phys, SE-10044 Stockholm, Sweden.
Royal Inst Technol, Dept Mat Sci & Engn, Appl Mat Phys, SE-10044 Stockholm, Sweden.
Royal Inst Technol, Dept Mat Sci & Engn, Appl Mat Phys, SE-10044 Stockholm, Sweden.
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2018 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 149, p. 388-396Article in journal (Refereed) Published
Abstract [en]

The CrCoNi-based medium and high entropy alloys (MHEAs) have drawn much attention due to their exceptional mechanical properties at cryogenic temperatures. The twinning critical resolved shear stress (CRSS) is a fundamental parameter for evaluating the strength-ductility properties of MHEAs. Here we construct and apply an extended twinning nucleation Peierls-Nabarro (P-N) model to predict the twinning CRSSes of face-centered cubic (FCC) CrCoNi-based MHEAs. The order of the twinning CRSSes of the selected alloys is CrCoNi > CrCoNiMn > CrCoNiFe > CrCoNiFeMn and the values are 291, 277, 274 and 236 MPa, respectively. These theoretical predictions agree very well with the experimental twinning CRSSes of CrCoNi and CrCoNiFeMn accounting for 260 +/- 30 and 235 +/- 10 MPa, respectively and are perfectly consistent with the strength-ductility properties including yield stress, ultimate tensile stress and uniform elongation for fracture of the FCC CrCoNi-based MHEAs obtained at cryogenic temperatures. The present method offers a first-principle quantum-mechanical tool for optimizing and designing new MHEAs with exceptional mechanical properties.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2018. Vol. 149, p. 388-396
Keywords [en]
Critical resolved shear stress (CRSS), Medium and high entropy alloys (MHEAs), Twinning nucleation, Density functional theory
National Category
Metallurgy and Metallic Materials Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-356197DOI: 10.1016/j.actamat.2018.02.037ISI: 000430895000034OAI: oai:DiVA.org:uu-356197DiVA, id: diva2:1236024
Funder
Swedish Research CouncilSwedish Foundation for Strategic Research VINNOVA, 2014-03374The Swedish Foundation for International Cooperation in Research and Higher Education (STINT)Carl Tryggers foundation Available from: 2018-07-30 Created: 2018-07-30 Last updated: 2018-07-30Bibliographically approved

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Vitos, Levente

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