Abstract
In the WC-β-Co alloy system (β; solid solution of WC/TiC ?? 70/30), anomalous phases (called X phases) which have never been reported, were found to form under certain conditions. The present paper describes the forming conditions and properties of X phases in the WC-β-Co alloy specimen. X phases appeared only when the alloy specimen with carbon content so high as to contain free carbon was sintered at low temperatures up to 1380°C. The X phases crystallized during sintering. They were flaky and assumed to be hexagonal phases.
