Abstract
The tensile fracture behaviour of a rapidly solidified Al scrap alloy has been investigated under different metallurgical (rapid solidification by the melt spinning vs. Osprey processes; tempers of as-extruded vs. heat-treated states) and mechanical (plain vs. notched tension) conditions. It is shown that pure shear fracture occurs only in the as-extruded smooth tensile specimens of the alloy solidified by the melt spinning process. The precipitation hardening treatment promotes the normal (flat) fracture mode in plain tension, and moderates the extent of delamination in notched tension. Based on the interaction between a stress constraint and weak boundary, a constraint-releasing mechanism has been proposed here which accounts for the experimental conditions involved.
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