Abstract
AbstractCentrifugally atomised powder and selfpropagating high temperature synthesis (SHS) alloy powder were canned and hipped. The compressive yield strength of the hipped atomised powder was ~390MN m−2 in the range of room temperature to 1073 K, and decreased above 1173 K. For both the atomised and SHS powders, the bending ductility was ~0·5% at room temperature in vacuum, and cleavage facets were observed on the fracture surfaces. Bending ductility increased with testing temperature up to 1073 K, and decreased above 1173 K. Ductility was much greater for the atomised than for the SHS powder. Grain boundary facets and prior powder boundary facets were observed at 973 and 1173K respectively, and bend strength and ductility were affected by an environment of air for both materials. Crack growth was detected in delayed fracture tests in air at room temperature for the specimens with a Vickers indentation, and grain boundary facets were observed on the delayed fracture surface. PM/0515
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