Abstract
In this study, ultrafine-grained W alloys with various amount of La2O3 addition (0.5 ~ 5.0 wt pct) have been prepared by pressureless sintering. The influence of the addition of La2O3 particles on the grain growth of ultrafine-grained W alloys have been studied. The results showed that the addition of La2O3 particles can significantly decrease the grain growth rate, but it seems counterintuitive that the ultrafine-grained W alloy with 2.0 wt pct La2O3 addition, rather than 5.0 wt pct, has the smallest grain size (1.23 μm) after annealing at 1900 °C for 6 h. To reveal the abnormal grain growth behavior, the inhibition effect of the size and distribution of La2O3 particles on grain growth was analyzed, suggesting that the excessive addition of La2O3 particles can cause an abnormal increase in grain size duo to the large fraction of intergranular particles, the small-particle spacing and the high mass transfer rate at the grain boundary.
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