Deformation twining is a well-known plastic deformation mechanism observed in HCP crystals such as Ti. This presentation highlights observance of different types of twinning (tension and/or compression) along with it’s variant for various types of applied loading on Ti single crystals along different directions [1-6 and references within]. Overall, it was observed that activation of twin systems and its variants cannot be directly relegated to follow Schmid’s criterion irrespective of different loading conditions. It was also observed that under some loading conditions, twin variants with the same Schmid factor may not contribute equally to the total twin volume fraction. It should also be noted that even though twinning is one of the dominant plastic deformation mechanisms observed in Ti under different types of loading conditions, other mechanisms such as dislocation slips and phase transformations can also be observed in the material.
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[2] Rawat, S., Mitra, N. (2021). Phil. Mag., 101(4), 435-449.
[3] Rawat, S., Mitra, N. (2020). Comput. Mater. Sci., 172, 109325.
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[6] Rawat, S., and Mitra, N. (2017). Comput. Mater. Sci., 126, 228-237.
