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Article Dans Une Revue Scripta Materialia Année : 2023

Thermally activated nature of synchro-Shockley dislocations in Laves phases

Résumé

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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Dates et versions

hal-04135686 , version 1 (21-06-2023)

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Zhuocheng Xie, Dimitri Chauraud, Achraf Atila, Erik Bitzek, Sandra Korte-Kerzel, et al.. Thermally activated nature of synchro-Shockley dislocations in Laves phases. Scripta Materialia, 2023, 235, pp.115588. ⟨10.1016/j.scriptamat.2023.115588⟩. ⟨hal-04135686⟩
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