Ni 함량과 W 결정립 크기에 따른 W-Ni 활성소결체의 고온압축 특성

Abstract

High temperature deformation behavior of activated sintered W powder compacts was investigated. The compression tests were carried out in the temperature range between 900 and 1100℃ at the strain rate of 10-3s-1. The sintered specimens of Ni-doped submicron W powder compacts showed decrease in W grain size with increasing the Ni content. As the result, the flow stress was significantly increased with increasing the Ni content. We obtained Ni-activated sintered W compacts with the relative density of 94±1% and the average grain size of less than 5mm. A moderate true strain up to 0.60 was obtained without fracture even at 1100℃ with the strain rate of 10-3s-1 for the activated W compact despite adding the 1.0wt%Ni to submicron W powder.