高温He离子辐照GH3535合金的损伤效应

陈倩; 张柯; 刘仁多; 付崇龙; 白菊菊; 杨旭; 王永其; 雷前涛; 李健健; 林俊

doi:10.7538/yzk.2019.youxian.0633

高温He离子辐照GH3535合金的损伤效应

Irradiation Damage in GH3535 Alloy under He Ion Irradiation at High Temperature

摘要

摘要: 采用500 keV的He离子在750 ℃下对GH3535合金样品进行辐照，然后利用掠入射X射线衍射（GIXRD）、透射电子显微镜（TEM）和纳米压痕仪分别对样品的氦泡和位错环辐照缺陷的演化及纳米硬度的变化进行了研究。结果表明，GH3535合金晶格辐照后发生了轻微畸变；离子辐照在样品中形成了大量尺寸为2～5 nm的氦泡和位错环。辐照产生的氦泡和位错环等缺陷在基体中钉扎位错，从而使材料产生了辐照硬化现象，样品硬度随辐照剂量的增加而增大。当辐照剂量达2×1016 cm-2时，辐照样品发生了明显的硬化饱和现象，利用NixGao模型计算得此时的硬化程度为64%。

Abstract: The GH3535 alloy was irradiated with 500 keV He ion at 750 ℃ and subsequently characterized using grazing incidence Xray diffraction (GIXRD), transmission electron microscopy (TEM) and nanoindentation measurement. The evolution of radiation defects such as bubbles and dislocation loops was investigated and the nanohardness variations of irradiated samples were surveyed. The results show that a slight distortion is in lattice of irradiated GH3535 alloy. A large number of bubbles and dislocation loops are observed in the irradiated samples with size of 25 nm. Irradiation defects such as bubbles and dislocation loops limit the dislocation mobility to improve the hardness value. The hardness of irradiated samples increases with dose. Up to a dose of 2×1016 cm-2, the irradiated samples show significant hardening saturation, and the hardening degree is 64% calculated by the NixGao model.

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