Stress-induced phase transformation and phase boundary sliding in Ti: An atomically resolved in-situ analysis

ZD Kou and XT Li and R Huang and LX Yang and YQ Yang and T Feng and S Lan and G Wilde and QQ Lai and S Tang, JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY, 152, 30-36 (2023).

DOI: 10.1016/j.jmst.2022.12.029

In-situ tensile experiments on pure Ti were performed in a transmission electron microscope at room temperature. The dynamic process of stress- induced hexagonal closed-packed (hcp) to face-centered cu-bic (fcc) structural transformation ahead of a crack tip was captured at the atomic level. Intriguingly, a sliding behavior of the ensuing (0 0 01)hcp/(11 over line 1 )fcc phase boundary was observed to further accommodate the plastic deformation until crack initiation. The sliding was accomplished via the successive conserva-tive glide of extended dislocations along the (0 0 01)hcp/(11 over line 1 )fcc phase boundary. A molecular dynamics simulation was carried out to corroborate the experiments and the results confirm the new dislocation -mediated sliding mechanism.(c) 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

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