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Experimental study of the gamma-surface of austenitic stainless steels
Dalarna Univ, Mat Sci Grp, SE-79188 Falun, Sweden;Royal Inst Technol, Dept Mat Sci & Engn, Appl Mat Phys, SE-10044 Stockholm, Sweden.
Dalarna Univ, Mat Sci Grp, SE-79188 Falun, 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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2019 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 173, p. 34-43Article in journal (Refereed) Published
Abstract [en]

We introduce a theory-guided experimental approach to study the gamma-surface of austenitic stainless steels. The gamma-surface includes a series of intrinsic energy barriers (IEBs), which are connected to the unstable stacking fault (USF), the intrinsic stacking fault (ISF), the unstable twinning fault (UTF) and the extrinsic stacking fault (ESF) energies. The approach uses the relationship between the Schmid factors and the effective energy barriers for twinning and slip. The deformation modes are identified as a function of grain orientation using in situ electron backscatter diffraction measurements. The observed critical grain orientation separating the twinning and slip regimes yields the USF energy, which combined with the universal scaling law provides access to all IEBs. The measured IEBs and the critical twinning stress are verified by direct first-principles calculations. The present advance opens new opportunities for modelling the plastic deformation mechanisms in multi-component alloys. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2019. Vol. 173, p. 34-43
Keywords [en]
Stacking fault energy, Twinning, Electron backscatter diffraction, Plasticity, First-principles
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:uu:diva-390923DOI: 10.1016/j.actamat.2019.04.057ISI: 000472812300005OAI: oai:DiVA.org:uu-390923DiVA, id: diva2:1343181
Funder
Swedish Research CouncilSwedish Foundation for Strategic Research Swedish Energy AgencyCarl Tryggers foundation Vinnova, 2014-03374Available from: 2019-08-15 Created: 2019-08-15 Last updated: 2019-08-15Bibliographically approved

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Vitos, Levente

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