Influence of Metal Additives on Microstructure and Properties of Amorphous Metal–SiOC Composites
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Strong, ductile, and irradiation-tolerant structural materials are in urgent demand for improving the safety and efficiency of advanced nuclear reactors. Amorphous ceramics could be promising candidates for high irradiation tolerance due to thermal stability and lack of crystal defects. However, they are very brittle due to plastic flow instability. Here, we realized enhanced plasticity of amorphous ceramics through compositional and microstructural engineering. Two metal–amorphous ceramic composites, Fe-SiOC and Cu-SiOC, were fabricated by magnetron sputtering. Iron atoms are preferred to form uniformly distributed nano-sized Fe-rich amorphous clusters, while copper atoms grow non-uniformly distributed nano-crystalline Cu particles. The Fe-SiOC composite exhibits high strength and plasticity associated with strain hardening, as well as a good thermal stability and irradiation tolerance. In contrast, the Cu-SiOC composite displays a very low plasticity and poor thermal stability. These findings suggest that the metal constituents play a crucial role in developing microstructure and determining properties of metal–amorphous composites.
We acknowledge the partial financial support from the Department of Energy (DOE) Office of Nuclear Energy and Nuclear Energy Enabling Technologies through Award No. DE-NE0008415, and from the Nebraska Public Power District through the Nebraska Center for Energy Sciences Research at the University of Nebraska-Lincoln. The research was performed in part in National Nanotechnology Coordinated Infrastructure and the Nebraska Center for Materials and Nanoscience, which are supported by the National Science Foundation under Award ECCS: 1542182 and the Nebraska Research Initiative. Ion irradiation was performed at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. DOE Office of Science. Los Alamos National Laboratory, an affirmative action equal opportunity employer, is operated by Los Alamos National Security, LLC, for the National Nuclear Security Administration of the U.S. Department of Energy under Contract DE-AC52-06NA25396.
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