Abstract
The dramatic characteristics of serrated flow, i.e., Portevin-Le Châtelier (PLC) effect was observed in AlN/AZ91 composites under uniaxial compression testing at 350 °C with a strain rate of 0.05 s−1. The results show that the PLC effect mainly originates from the repeated shearing of extension twins by pyramidal <c + a > dislocations in favorably orientated grains, while the profuse activation of extension twins and pyramidal <c + a > dislocations was induced by AlN particles, which provides new insights into the PLC effect in magnesium-based materials.
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