Cascade size and dose rate effects on a' precipitation in ion-irradiated Fe14Cr alloy
Cascade size and dose rate effects on a' precipitation in ion-irradiated Fe14Cr alloy
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级联尺寸和剂量率对离子辐照 Fe14Cr 合金中 a 析出的影响
DOI：
10.1016/j.scriptamat.2019.06.034
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发表时间：
2019
影响因子：
6
通讯作者：
Harrison R
中科院分区：
文献类型：
--
作者：
Harrison R
用分析型扫描透射电镜研究了离子辐照下Fe 14 Cr中α′形成的剂量率效应和级联效应。样品在300 °C下用100 keV He、350 keV Ne或1 MeV Kr离子辐照，剂量为2.5 DPA，剂量率为10− 4和10− 3位移/原子（DPA）/s。在He离子辐照下，较高的剂量率加速α′沉淀，导致相似的沉淀尺寸和密度。α′相的数量密度随着离子质量和能量的增加而降低，这归因于高能量密度级联形成和子级联重叠的弹道混合。
Dose rate and cascade size effects on α′ formation in Fe14Cr have been studied under ion irradiation using analytical scanning transmission electron microscopy. Samples were irradiated with 100 keV He, 350 keV Ne or 1 MeV Kr ions at 300 °C to a dose of 2.5 DPA at dose rates of 10−4and 10−3displacements per atom (DPA)/s. Higher dose rates commensurately accelerate α′ precipitation under He ion irradiation, resulting in similar precipitate sizes and density. Number densities of α′ precipitates decreased with increasing ion mass and energy attributed to ballistic mixing from high-energy-density cascade formation and sub-cascade overlap.