Strain rate dependence of tensile properties of tungsten alloys for plasma-facing components in fusion reactors

Abstract

The strain rate dependence of tensile properties such as yield stress and fracture strain of W-3%Re and K-doped W-3%Re plates in the temperature range from room temperature (RT) to 300°C was investigated in this work. The examined W alloy plates were fabricated by the same process and with the same reduction ratios. The yield stress of W-3%Re changed significantly with increasing strain rate as compared to K-doped W-3%Re. The strain rate sensitivity of W-3%Re was decreased by K-bubble dispersion. The low-temperature strength and ductility of W-3%Re was improved by K-bubble dispersion, although the fracture strain of K-doped W-3%Re was lower than that of W-3%Re at 200 and 300°C.