A New Variant Selection Criterion for Twin Variants in Titanium Alloys (Part 1)
Résumé
Deformation twinning is one of the main deformation modes in crystalline solids particularly in low symmetry or multiple lattice structures. [1-8] Though extensive studies have addressed on the crystallography, [9-11] morphology [12] and mechanical behavior [2,13] of deformation twins, and numerous models for twinning have been suggested over the last few decades, [14,15] some fundamental issues remain unclear. The nucleation and growth mechanism of twin lamellae, the interaction of twinning with crystal defects, and the interfacial accommodation between the matrix and twins [16,17] are still poorly understood. In the case of titanium alloys, many authors have attempted to determine the presence of the different types of twins as a function of the deformation temperature or grain size [18,19,20] as well as to extract useful information for modeling. [1,21] Although the twin type and the twin volume fraction can be easily determined, [22] the type of variants present as well as the sequence in which they appear in one grain are not well revealed. Recently, we have developed the ''interrupted in situ SEM/EBSD orientation examination method'' to follow the
Domaines
Matériaux
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