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Article Dans Une Revue Journal of Alloys and Compounds Année : 2021

Activation volume and the role of solute atoms in Al-Mg-Si alloy processed by equal channel angular extrusion

Résumé

Grain refinement to the sub-micron scale was found to enhance both strength and plasticity. In this size range, the micro-mechanisms of deformation are not yet sufficiently specified. In the present work, strain rate sensitivity was investigated in an Al-Mg-Si alloy processed by equal-channel angular extrusion. The microstructure was controlled by conventional transmission electron microscopy and orientation imaging-ASTAR. In the as-quenched state, deformation produces grains below 100 nm in size. The activation volume V was reduced to 70b 3. Based on published theoretical models, we have shown that in such alloy, pure grain boundary sliding cannot be revealed in the low-stress range, due to the intervention of solute atoms. Beyond, the stressdependence of V consists with an inverse Cottrell-Stokes behavior. This trend was confirmed by TEM which revealed dislocation activity and grain boundary emission. Ageing at 150 °C increases the contribution of GBS whereas the residual activation volume continues to be leveled.
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Dates et versions

hal-03823734 , version 1 (21-10-2022)

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Amel Soula, Jean Philippe Couzinié, Hanen Heni, Julie Bourgon, Yannick Champion, et al.. Activation volume and the role of solute atoms in Al-Mg-Si alloy processed by equal channel angular extrusion. Journal of Alloys and Compounds, 2021, 899, pp.163334. ⟨10.1016/j.jallcom.2021.163334⟩. ⟨hal-03823734⟩
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