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Bertrand, E., Castany, P., Yang, Y., Menou, E., Couturier, L. & Gloriant, T. (2022) Origin of 112 < 111 > antitwinning in a Ti-24Nb-4Zr-8Sn superelastic single crystal. J Mater Sci, 57 7327–7342. 
Added by: Richard Baschera (2022-04-29 14:16:56)   Last edited by: Richard Baschera (2022-04-29 14:23:39)
Type de référence: Article
DOI: 10.1007/s10853-022-07086-y
Numéro d'identification (ISBN etc.): 1573-4803
Clé BibTeX: Bertrand2022
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Catégories: ID2M, INTERNATIONAL
Créateurs: Bertrand, Castany, Couturier, Gloriant, Menou, Yang
Collection: J Mater Sci
Consultations : 1/96
Indice de consultation : 18%
Indice de popularité : 4.5%
Liens URLs     https://doi.org/10 ... s10853-022-07086-y
Résumé     
{112}< 111 >(beta) twins are observed in a superelastic beta Ti-24Nb-4Zr-8Sn (wt.%) single crystal after tensile test. A careful Schmid factor analysis shows that these twins are formed in the antitwinning sense regarding the classical {112}< 111 >(beta) twinning system of bcc structures. These are then {112}< 111 >(beta) antitwins. Moreover, a full stress-induced martensitic (SIM) transformation of beta phase into a`` martensite is evidenced from in situ synchrotron X-ray diffraction. This transformation is fully accomplished before the onset of plastic deformation and, in turn, the formation of twins. From crystallographic reconstruction, {112}< 111 >(beta) antitwins are shown to be passively formed from the reversion, during the reverse SIM transformation when the stress is released, of {110}< 110 >(alpha '') twins actually formed in alpha '' martensite. The martensitic transformation occurring before twinning plays a key role in the activation of antitwinning systems by reducing both shear and shuffle magnitudes of twinning. Variant selection of stress-induced martensite and Schmid factor analysis show that the classical {112}< 111 >(beta) twins can never be activated in b titanium alloys involving SIM transformation, while the non-classical {112}< 111 >(beta) twinning system in the antitwinning sense is always favored.
  
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