Deformation twinning-induced texture evolution in Ti under shock compression: An atomistic simulation study

YT Chen and SC Hu and L Wang and L Lu and NB Zhang and Y Cai and SN Luo, JOURNAL OF APPLIED PHYSICS, 138, 025106 (2025).

DOI: 10.1063/5.0266620

Shock-induced texture evolution in polycrystalline titanium (Ti) with different initial textures under different impact velocities is investigated systematically via large-scale molecular dynamics simulations. 1012< 1011 >, 1011< 1012 >, and 1121< 1126> deformation twinning are observed upon shock compression; however, the texture evolution is mainly attributed to 1012 and 1011 twinning based on resolved shear stress analysis and orientation mapping. When a single-step texture change occurs in the loading configuration, the 1011 twinning dominates, whereas when a two-step texture change occurs in the loading configuration, the 1012 twinning prevails: a new texture is initially induced via the 1012 twinning, followed by the formation of another texture component through the 1011 twinning, except for the loading configuration initially with no texture. The twinning dislocations of 1121 twins comprise both an edge component and a screw component. The 1012 and 1011 twinning occur via the HCPmatrix to BCC to HCPtwin phase transformation sequence, induced solely by atomic shuffles without shear deformation. The HCP phase and the transient BCC phase obey the Pitsch-Schrader orientation relationship. Different twinning relationships can be achieved by different variants during phase transformation.

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