Abstract
The martensitic phase transformation in Ti-base TiV b.c.c. alloys is studied using the Embedded Atom Method (EAM) interatomic potentials to quantify the atomic interactions and Molecular Dynamics (MD) simulations to determine the temporal evolution of atomic positions. The EAM-based total energy calculations showed, and the MD simulation results confirmed, that the actual b.c.c. → h.c.p. transformation (minimum barrier) path involves a simultaneous operation of the {110}〈 1 10〉 shuffling and the {112}〈11 1 〉 shear processes, and that the transformation is initially dominated by the shuffling. The b.c.c. structure is unstable in Ti, that is there is no energy barrier along the b.c.c. → h.c.p. transformation path, and the transformation is complete. The addition of vanadium, however, stabilizes the b.c.c. structure, causing the b.c.c. → h.c.p. transformation to be incomplete in Ti15V and completely absent in Ti25V. The progress of the transformation is significantly effected by the b.c.c. → h.c.p. mismatch stresses which develop during the transformation. The matrix constraints and free surfaces play an important role in the martensitic transformation, affecting the type of the variant and even the crystal structure of the product phase.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.