Abstract
Abstract Deuterium implantation with 60 keV was carried out in V-4Cr-4Ti-1.8Y-0.4Ti3SiC2 alloy prepared via MA-HIP method and V-4Cr-4Ti alloys prepared by VAR. Dispersion particles, Ti-rich precipitates and irradiation-induced dislocation loops are studied using TEM. Micro-hardness and radiation-hardening are measured using Nano-indenter. The dissolving of additional Ti3SiC2 particles and the formation of Y2O3, (Ti, Si) C and Y2 (Ti, Si) 2O7 particles are observed in V-4Cr-4Ti-1.8Y-0.4Ti3SiC2 alloy. Ti-rich precipitates in both alloys prefer to grow along M direction, where the precipitates/matrix interfaces have minimum distortion energy. Ti-rich precipitates in V-4Cr-4Ti-1.8Y-0.4Ti3SiC2 alloy is much smaller. Although the mean size and density of dislocation loops is similar in both kinds of alloy, V-4Cr-4Ti-1.8Y-0.4Ti3SiC2 alloy has a much lower radiation-hardening. TEM results show that Ti-rich precipitates in V-4Cr-4Ti-1.8Y-0.4Ti3SiC2 alloy grow up after irradiation, while the size of precipitates decrease in V-4Cr-4Ti alloy. The calculation results based on Orowan mechanism show that the size evolution of Ti-rich precipitates is the dominant factor for the different behavior of two alloy on radiation-hardening.
Published Version
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