LAUSR

Abstract The quasi-static tensile behavior of tungsten/glass composites containing 40-50 vol.% tungsten at elevated temperatures in the range of 550-750°C was investigated. Results show that the composites present absolute brittleness at temperatures up to 650°C while exhibit brittle-to-ductile transition in the temperature range of 650-700°C and super-plasticity at 750°C due to the decreasing viscosity of glass matrix. The strength of the composites declines with the increase of tungsten content at temperatures lower than 650°C and increases with increasing the volume fraction of tungsten at 750°C. In the temperatures between 650 and 700°C, 55BH/45W exhibits the highest strength while 60BH/40W presents the lowest one. The elongations of the composites reduce with increasing tungsten content at 750°C because of the amount of W/W and W/G interfaces increasing. In addition, the effects of temperature and tungsten content on the deformation and fracture mechanism of the composite were analyzed.