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Grain orientation dependence of the forward and reverse fcc - hcp transformation in FeMnSi-based shape memory alloys studied by in situ neutron diffraction
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SYSNO ASEP 0535125 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Grain orientation dependence of the forward and reverse fcc - hcp transformation in FeMnSi-based shape memory alloys studied by in situ neutron diffraction Author(s) Arabi-Hashemi, A. (CH)
Polatidis, E. (CH)
Šmíd, Miroslav (UFM-A) RID, ORCID
Panzner, T. (CH)
Leinenbach, C. (CH)Number of authors 5 Article number 139261 Source Title Materials Science and Engineering A Structural Materials Properties Microstructure and Processing. - : Elsevier - ISSN 0921-5093
Roč. 782, APR (2020)Number of pages 11 s. Language eng - English Country CH - Switzerland Keywords FeMnSi ; Neutron diffraction ; Martensite transformation ; Schmid factor Subject RIV BA - General Mathematics OECD category Pure mathematics Method of publishing Limited access Institutional support UFM-A - RVO:68081723 UT WOS 000525797900009 EID SCOPUS 85081665020 DOI 10.1016/j.msea.2020.139261 Annotation The grain orientation dependence of the deformation-induced forward fcc -> hcp and reverse hcp -> fcc martensite transformation of a FeMnSi-based shape memory alloy was studied by in situ neutron diffraction during cyclic loading. A deformation-induced fcc -> hcp transformation is observed during tensile straining to +2%. The hcp martensite phase that forms under tension partially reverts to fcc austenite upon subsequent compression from +2% -> -2% for the {220}, {331} and {111} grain families aligned with respect to the loading direction but not for the {200} grain family. The martensite formation and the reversion of the individual grains can be explained by considering grain orientation dependent Schmid factors of the {111} 112 slip system underlying the fcc to hcp transformation. While for post-yield elastically compliant grains the Schmid factor of the leading partial dislocation is larger than that of the trailing partial dislocation, the opposite is true for post-yield elastically stiff grains. The former grains show a phase reversion, i.e. hcp -> fcc upon compression, the latter grains do not transform back to fcc. EBSD characterization confirms the phase reversion for a 541 orientated grain by the disappearance of hcp bands. Martensite bands, which have not reverted to austenite during compression, showed a thickening. The thickening of existing bands during compression is associated with the activation of a second slip system. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2021 Electronic address https://www.sciencedirect.com/science/article/pii/S0921509320303440?via%3Dihub
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