Plastic relaxation and solute segregation to β-Nb second phase particles in Zr-Nb alloys: A discrete dislocation plasticity study

Reali, Luca; Balint, Daniel S.; Wenman, M.R.

doi:10.1016/j.jmps.2021.104581

Cited by 8 publications

(1 citation statement)

References 52 publications

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“…mainly two types of precipitates in Zr-Sn-Nb alloy after the Pilger rolling [8], i.e. hcp Zr(Nb, Fe) 2 Laves phase with more irregular shape and larger size from 0.2 to 1.0 µm [7,9], as well as bcc β-Nb phase with a rounder shape and smaller size of about 30 nm [10,11]. Besides, Nb clusters containing several atoms are often observed [12].…”

Section: Introductionmentioning

confidence: 98%

Atomistic simulations of the interaction of edge dislocations with β-Nb precipitates in Zr-Nb alloys

Lin,

Chen,

Bai

et al. 2024

J. Phys. D: Appl. Phys.

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Experiments have shown that precipitation can affect the mechanical properties of zirconium alloy, but the interaction mechanism between dislocations and Nb precipitates in zirconium alloys is still unclear. Thus, a systematic molecular dynamics study was performed to investigate the interaction between edge dislocations and Nb precipitates. It was found that the dislocation passed through Nb precipitate by shear mechanism, and the critical resolved shear stress increased with the diameter of the precipitate. After completion of the interaction, dislocations formed jogs due to climb when the precipitates were larger than 2 or 3 nm. Some atoms in the precipitate were more disordered after dislocation shearing, and dislocation fragments were generated around the precipitate, both of which lead to the precipitate hardening. The calculation of obstacle strength further confirmed that unsheared Nb precipitates until hundred nanometers were the weak obstacle for dislocations.

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