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Experimental study of the γ-surface of austenitic stainless steels
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics. Materials Science Group, Dalarna University, Falun, SE-791 88, Sweden.
Högskolan Dalarna.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.ORCID iD: 0000-0001-7724-8299
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: 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 γ-surface of austenitic stainless steels. The γ-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.

Place, publisher, year, edition, pages
2019. Vol. 173, p. 34-43
Keywords [en]
stacking fault energy, twinning, electron backscatter diffraction, plasticity, first-principles
National Category
Metallurgy and Metallic Materials
Research subject
Materials Science and Engineering
Identifiers
URN: urn:nbn:se:kth:diva-252729DOI: 10.1016/j.actamat.2019.04.057Scopus ID: 2-s2.0-85065259834OAI: oai:DiVA.org:kth-252729DiVA, id: diva2:1320337
Funder
Vinnova, 2014-03374
Note

QC 20190617

Available from: 2019-06-04 Created: 2019-06-04 Last updated: 2019-07-29Bibliographically approved

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Molnár, Dávid SándorLi, WeiLu, SongHedström, PeterVitos, Levente

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