Interaction between < c > dislocation loop and 10(1)over-bar2 twin boundary in magnesium

J Tang and CL Xu and ZK Li and XB Tian and WT Jiang and QY Wang and HD Fan, JOURNAL OF NUCLEAR MATERIALS, 560, 153495 (2022).

DOI: 10.1016/j.jnucmat.2021.153495

In this work, molecular dynamics simulations were employed to investigate the interaction between a 10 (1) over bar2 twin boundary (TB) and irradiation-induced < c > dislocation loops in magnesium at room temperature. According to the geometry of the Burgers vectors with respect to TB, three sets of partial Burgers vectors can be identified, i.e. 1 / 6 20 ((2)overbar) 3 + 1 / 6 ((2)overbar) 023 , 1 / 6 2 ((2)overbar) 03 + 1 / 6 ((2)overbar) 203 and 1 / 2 0 0 01 + 1 / 2 0 0 01 , which cover all the possible interaction styles between < c > dislocation loop and TB. The simulation results show that, although the partial Burgers vectors are different, the TB is able to always transform all the dislocation loops into glissile < a > dislocation loops in the twin. Therefore, an elimination mechanism of the irradiation-induced defects can be proposed in magnesium, i.e. by interaction with TB. The current work provides new insights into understanding the irradiation effects in magnesium and other hexagonal close-packed metals. (C)& nbsp;2021 Elsevier B.V. All rights reserved.

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