High Temperature Deformation Processes and Strengthening Mechanisms in Intermetallic Particulate Composites

Hot deformation behaviour of bamboo leaf ash–silicon carbide hybrid reinforced aluminium based composite

“…Similar reports have been made by Chen et al [11] and Xu et al [66]. Apart from the activation energy, the stress exponent could also give an indication of the mechanisms controlling the deformation process [24,66]. Nix [24] reported that when the stress exponent values near 5, the deformation is strictly controlled by mobility of dislocation rather than dislocation substructure.…”

“…As already pointed out, the flow stress increased consistently with decreasing deformation temperature. The observed increase in flow stress with decrease in deformation temperature can be attributed to the decrease in dislocation mobility at lower deformation temperature on account of the reduced pathways/channels for dislocation motion [23,24]. Under all test conditions, the flow stress increased rapidly at the initial stage of deformation due to the dominance of work hardening [8,18,25], while at the later stage of the deformation (with increased strain), the signatures of flow softening such as a drop-in flow stress or the attainment of a steady-state flow stress became visible [8,26,27].…”

“…Apart from the activation energy, the stress exponent could also give an indication of the mechanisms controlling the deformation process [24,66]. Nix [24] reported that when the stress exponent values near 5, the deformation is strictly controlled by mobility of dislocation rather than dislocation substructure. In addition, it was stated that the flow stress of dislocation mobility controlled deformation showed sensitivity to changes in strain rate.…”