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探讨了在0.5Tm(Tm为材料熔点)温度附近一种氧化物粒子弥散强化的铁基合金中惰性气体离子辐照引起的组织结构变化.实验利用高能20Ne离子辐照材料样品至3个剂量水平.借助透射电子显微镜发现,即使在最高辐照剂量,材料的晶界处也没有发生空洞的加速生长,显著区别于相同辐照条件下传统铁基合金的组织结构变化.这个特点反映出氧化物粒子弥散强化合金具有在高温和高氦产生率的苛刻环境中(诸如在聚变堆内部)使用的潜力.晶界处空洞生长的抑制效应可归因于材料晶粒内部高密度的氧化物纳米颗粒的界面对惰性气体原子的有效俘获和对辐照缺陷的回复作用.
The change of microstructures induced by the irradiation of inert gas ions in a Fe-based alloy dispersion strengthened at a temperature of 0.5Tm (Tm is the melting point of the material) was investigated by irradiating the material samples with high energy 20Ne ions to three dose levels It was found by transmission electron microscopy that even at the highest irradiation dose, the accelerated growth of voids did not occur at the grain boundary of the material, which was significantly different from that of the conventional iron-based alloy under the same irradiation conditions.This characteristic reflected that the oxide Particle dispersion strengthened alloys have the potential to be used in harsh environments of high temperatures and high helium production rates, such as inside the fusion reactor.The inhibitory effect of void growth at the grain boundaries can be attributed to the high density of oxide nanoparticles inside the material grains Of the effective capture of inert gas atoms and the role of irradiation defects.