Tensile deformation and fracture behavior of a rapidly solidified Al-3wt%Mn alloy containing second phase particles at grain boundaries were investigated over a temperature range of room temperature to 500°C and a strain rate range of 5.2 × 10
-55.2 × 10
-3s
-1. At 200°C and below, both strength and ductility are remarkably superior to those of the normally solidified alloy. At 300°C and above, ductility decreases markedly with elevated temperatures. Such a lack of ductility in the rapidly solidified alloy is always accompanied with intergranular fracture which may be caused by grain baundary sliding. The intergranular fracture is characterized by void nucleation at grain boundary perticles and by subsequent growth which occur preferentially at triple grain junctions or knees of grain boundaries.
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