Deformation mechanisms in a superelastic NiTi alloy: An in-situ high resolution digital image correlation study

0536175 - ÚFM 2021 RIV GB eng J - Článek v odborném periodiku
Polatidis, E. - Šmíd, M. - Kuběna, Ivo - Hsu, W-N. - Laplanche, G. - Van Swygenhoven, H.
Deformation mechanisms in a superelastic NiTi alloy: An in-situ high resolution digital image correlation study.
Materials and Design. Roč. 191, JUN (2020), č. článku 108622. ISSN 0264-1275. E-ISSN 1873-4197
Grant CEP: GA MŠMT(CZ) EF16_013/0001823
Institucionální podpora: RVO:68081723
Klíčová slova: shape-memory alloys * tension-compression asymmetry * martensitic-transformation * phase-transformations * plastic-deformation * strain localization * b2 phase * dependence * microstructure * twins * dic * ebsd * Phase transformation * NiTi * Schmid factor
Obor OECD: Pure mathematics
Impakt faktor: 7.991, rok: 2020
Způsob publikování: Open access
https://www.sciencedirect.com/science/article/pii/S0264127520301568?via%3Dihub

An in-situ high resolution digital image correlation investigation during uniaxial tensile deformation reveals the recoverable and the non-recoverable strain mechanisms in a Ni51Ti49 alloy with a mean grain size of 35 mu m. Recoverable strain is due to the martensitic transformation, for which more than one variant per grain can be activated. The majority of the activated variants exhibit high Schmid factor. The variant selection can be influenced by shear transmission across grain boundaries, when the geometrical compatibility between the neighboring habit plane variants is favourable, in these cases variants that do not have the highest Schmid factor, with respect to the macroscopically applied load, are activated. The experimentally determined transformation strains agree well with theoretical calculations for single crystals. The non-recoverable strain is due to deformation slip in austenite, twinning in martensite and residual martensite. The results are discussed in view of possible twinning modes that can occur in austenite resulting in significant non-recoverable strain.
Trvalý link: http://hdl.handle.net/11104/0313992