High temperature compressive deformation and fracture characteristics of the activated sintered W–Ni compacts

Abstract

In order to determine the working conditions for the Ni-activated sintered W compact, a wide range of compression test was carried out under controlled temperature conditions between 900 and 1100 °C and a constant true strain rate of 1 × 10 −3–1 × 10 0/s. A moderate true strain up to 0.6 was obtained without a fracture at the testing temperature of 900 °C irrespectively of the strain rate for the specimen of an appropriate porosity and controlled grain size, being comparable to that of the pure W specimen. The relationship between the brittle features and the segregated Ni phase was able to be discussed on the basis of the microstructural analysis on the fracture surface and the true stress–strain curve analysis.