Mitigation of He embrittlement and swelling in nickel by dispersed SiC nanoparticles
Mitigation of He embrittlement and swelling in nickel by dispersed SiC nanoparticles
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DOI：
10.1016/j.matdes.2015.10.147
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发表时间：
2016-01-15
影响因子：
8.4
通讯作者：
Xu, H. J.
中科院分区：
文献类型：
--
作者：
Huang, H. F.;Zhang, W.;Xu, H. J.
耐高温辐照镍基合金因其在熔盐堆中的应用前景而备受关注。采用透射电子显微镜（TEM）对纯镍和SiC纳米颗粒分散镍基合金（Ni-SiCNP复合材料）进行了表征，以确定在600℃下3mev氦离子照射下氦的扩散行为，离子影响高达3 × 10（20）个离子/m(2)。TEM结果表明，分散的SiCNP在镍中的存在可以抑制氦泡的生长，从而减轻镍基合金的氦脆和膨胀。利用密度泛函理论（DFT）的理论计算结果表明，氦原子倾向于扩散到SiCNP与镍基体之间的界面，从而避免了晶界偏析和氦气泡的生长。本研究证实了在镍基合金中分散碳化物以提高材料抗辐照性能的可行性。(C) 2015 Elsevier Ltd.版权所有。
The development of high-temperature irradiation-resistant nickel-based alloys has been receiving much attention due to their potential applications in molten salt reactors (MSRs). Pure nickel and SiC nanoparticles dispersed nickel-based alloys (Ni-SiCNP composites) have been characterized by transmission electron microscopy (TEM) to determine the helium diffusion behavior under 3 MeV helium ion irradiation at 600 degrees C with ion fluence up to 3 x 10(20) ions/m(2). The TEM results indicated that the presence of dispersed SiCNP in nickel can inhibit the growth of helium bubbles, thereby mitigate the helium embrittlement and swelling of nickel-based alloys. The theoretical calculation results using the density functional theory (DFT) showed that the helium atoms prefer to diffuse to the interface between SiCNP and nickel matrix, and thus avoid the grain boundary segregation and also the growth of helium bubbles. This study confirmed the feasibility of dispersing carbides in nickel-based alloys to improve the irradiation-resistant performance of materials. (C) 2015 Elsevier Ltd. All rights reserved.