|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Nanostructured Materials for Nuclear Applications
||Mitigation of He Embrittlement and Swelling in Nickel by Dispersed SiC Nanoparticles
||Hefei Huang, Zhijun Li, Jianqiang Wang, Ping Huai
|On-Site Speaker (Planned)
The development of high-temperature radiation-resistant alloys has been receiving much attention due to their potential applications in molten slat reactors (MSRs). Pure nickel and SiC nanoparticles dispersed nickel based alloys (Ni-SiCNP composites) have been characterized to determine the helium diffusion behaviour under 3MeV helium ion irradiation at 600 °C with ion dose up to 3×1016 ions/cm2. 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 Density Functional Theory showed that the helium atoms prefer to diffuse to the interface between SiCNP and nickel matrix, and thus avoid the grain boundary segregation of helium atoms and also the growth of helium bubbles. This study for the first time confirmed the feasibility of dispersed carbides in nickel based alloys for improving the irradiation resistance of materials.
||Planned: A print-only volume