Wei Bingqiang, Wu Wenqian, Wang Jian
Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USA.
Materials (Basel). 2023 Feb 6;16(4):1357. doi: 10.3390/ma16041357.
Ni-SiOC nanocomposites maintain crystal-amorphous dual-phase nanostructures after high-temperature annealing at different temperatures (600 °C, 800 °C and 1000 °C), while the feature sizes of crystal Ni and amorphous SiOC increase with the annealing temperature. Corresponding to the dual-phase nanostructures, Ni-SiOC nanocomposites exhibit a high strength and good plastic flow stability. In this study, we conducted a He implantation in Ni-SiOC nanocomposites at 300 °C by in-situ transmission electron microscope (TEM) irradiation test. In-situ TEM irradiation revealed that both crystal Ni and amorphous SiOC maintain stability under He irradiation. The 600 °C annealed sample presents a better He irradiation resistance, as manifested by a smaller He-bubble size and lower density. Both the grain boundary and crystal-amorphous phase boundary act as a sink to absorb He and irradiation-induced defects in the Ni matrix. More importantly, amorphous SiOC ceramic is immune to He irradiation damage, contributing to the He irradiation resistance of Ni alloy.
镍-碳化硅氧氮纳米复合材料在不同温度（600℃、800℃和1000℃）下高温退火后保持晶体-非晶双相纳米结构，而晶体镍和非晶碳化硅氧氮的特征尺寸随退火温度增加。对应于双相纳米结构，镍-碳化硅氧氮纳米复合材料表现出高强度和良好的塑性流动稳定性。在本研究中，我们通过原位透射电子显微镜（TEM）辐照试验在300℃下对镍-碳化硅氧氮纳米复合材料进行了氦离子注入。原位TEM辐照表明，晶体镍和非晶碳化硅氧氮在氦辐照下均保持稳定。600℃退火的样品表现出更好的抗氦辐照性能，表现为较小的氦泡尺寸和较低的密度。晶界和晶体-非晶相界均作为吸收氦和镍基体中辐照诱导缺陷的陷阱。更重要的是，非晶碳化硅氧氮陶瓷对氦辐照损伤免疫，有助于镍合金的抗氦辐照性能。
