Thermally activated nature of synchro-Shockley dislocations in Laves phases

Xie Z, Chauraud D, Atila A, Bitzek E, Korte-Kerzel S, Guénolé J (2023)


Publication Type: Journal article

Publication year: 2023

Journal

Book Volume: 235

Article Number: 115588

DOI: 10.1016/j.scriptamat.2023.115588

Abstract

Synchro-Shockley dislocations, as zonal dislocation, are the major carrier of plasticity in Laves phases at high temperatures. The motion of synchro-Shockley dislocations is composed of localized transition events, such as kink-pair nucleation and propagation, which possess small activation volumes, presumably leading to sensitive temperature and strain rate dependence on the Peierls stress. However, the thermally activated nature of synchro-Shockley dislocation motion is not fully understood so far. In this study, the transition mechanisms of the motion of synchro-Shockley dislocations at different shear and normal strain levels are studied. The transition processes of dislocation motion can be divided into shear-sensitive and -insensitive events. The external shear strain lowers the energy barriers of shear-sensitive events. Thermal assistance is indispensable in activating shear-insensitive events, implying that the motion of synchro-Shockley dislocations is prohibited at low temperatures.

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APA:

Xie, Z., Chauraud, D., Atila, A., Bitzek, E., Korte-Kerzel, S., & Guénolé, J. (2023). Thermally activated nature of synchro-Shockley dislocations in Laves phases. Scripta Materialia, 235. https://dx.doi.org/10.1016/j.scriptamat.2023.115588

MLA:

Xie, Zhuocheng, et al. "Thermally activated nature of synchro-Shockley dislocations in Laves phases." Scripta Materialia 235 (2023).

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