Abstract
The h c p → bcc and reverse phase transformation of titanium has been watched in situ and in real time by synchrotron X-ray topography from large α single crystals. Due to the large crystal volume investigated, the results can be considered as statistical. The heterogeneous nucleation character of this transformation has been shown and the orientation relationships between the two phases have been elucidated. This transformation is characterized by a severe selection of the variants. Very frequently, the transformation product, in the direct and reverse transformation, resolves into a texture composed of several little crystals with a same and sole orientation. An orientation memory effect of the titanium single crystals has been displayed. Also the sample geometric shape, the unit cell volumes, the shape deformation and the unusual temperature dependence of the vibrational entropy have been taken into account in discussing the results.
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Jourdan, C., Gastaldi, J., Marzo, P. et al. In situ statistical study of the nucleation, the variant selection and the orientation memory effect during the α⇌β titanium martensitic transformation. J Mater Sci 26, 4355–4360 (1991). https://doi.org/10.1007/BF00543651
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DOI: https://doi.org/10.1007/BF00543651