This paper investigated the formation of bubbles and precipitates and the hardening effects in V–4Cr–4Ti alloy after irradiation of He and H ions and post-irradiation annealing. Microstructures observation shows that small bubbles formed in as-irradiated samples, and, during the post-irradiation annealing, lath-like precipitates formed and small bubbles grew upon. It was found that bubbles surrounding precipitates were significantly smaller than those away from, and tended to align along the precipitates. Composition analysis shows that the precipitates comprised TiO with FCC structure. The effects of bubbles and precipitates on hardening were evaluated by the nanoindentation test, as well as the dispersed barrier model that explicitly considered the small bubbles in as-irradiated sample, large bubbles and TiO precipitates in post-irradiated annealed samples. Compared with the as-irradiated samples, the higher hardness in post-irradiated annealed samples is attributed to the co-existence of bubbles and precipitates.

本文研究了He和H离子辐照和辐照后退火后V-4Cr-4Ti合金中气泡和沉淀的形成以及硬化作用。显微组织观察表明，在辐照后的样品中形成了小气泡，并且在辐照后退火期间，形成了板条状沉淀物，并在其上生长了小气泡。发现围绕沉淀物的气泡明显小于远离沉淀物的气泡，并且倾向于沿着沉淀物排列。组成分析表明，沉淀物包含具有FCC结构的TiO。通过纳米压痕测试以及明确考虑辐照样品中小气泡的分散屏障模型评估了气泡和沉淀物对硬化的影响，辐照后的退火样品中会出现大气泡和TiO沉淀。与辐照后的样品相比，辐照后的退火样品中较高的硬度归因于气泡和沉淀物的共存。