Nanostructured Materials in Extreme Environments: Poster Session
Sponsored by: TMS Materials Processing and Manufacturing Division, TMS Structural Materials Division, TMS: Nanomechanical Materials Behavior Committee, TMS: Advanced Characterization, Testing, and Simulation Committee, TMS: Mechanical Behavior of Materials Committee, TMS: Nuclear Materials Committee
Program Organizers: Haiming Wen, Missouri University of Science and Technology; Nan Li, Los Alamos National Laboratory; Youxing Chen, University of North Carolina Charlotte; Yue Fan, University of Michigan; Niaz Abdolrahim, University of Rochester; Khalid Hattar, University of Tennessee Knoxville; Ruslan Valiev, UFA State Aviation Technical University; Zhaoping Lu, University of Science and Technology Beijing
Monday 5:30 PM
March 20, 2023
Room: Exhibit Hall G
Location: SDCC
G-22: Development of Nanostructured Ferritic Superalloys for Nuclear Environments: Sophia Von Tiedemann1; Kan Ma1; Pedro Ferreirós1; Alexander Knowles1; 1University of Birmingham
Nuclear fusion and generation-IV fission reactors will operate at increasingly extreme conditions regarding temperature and neutron flux. However, existing structural steels and zirconium alloys become limited in strength and creep resistance above ~500°C. Therefore, the development of new materials with high microstructural stability and strength at elevated temperatures, as well as resistance to irradiation damage, plays a key role in next-generation nuclear power. Ferritic (BCC) superalloys, based on a disordered A2/ferritic matrix strengthened by ordered-BCC B2/L21 nanoprecipitates, are being developed to meet these challenges. Fe-Al-X type systems have been studied following ageing heat treatments and proton irradiation. The effect of changes in precipitate volume fraction (precipitate-matrix interfacial area) and lattice misfit, on nano-hardness, irradiation-induced defect formation and sink strength were investigated. Characterisation was carried out using Scanning and Transmission Electron Microscopy (SEM, TEM, STEM), Atom Probe Tomography (APT) and nano-indentation pre- and post-proton irradiation.
G-23: Scalable Fabrication and Mechanical Response of Composites with Nano-architected Features: Kevin Nakahara1; Matias Kagias1; Seola Lee1; Julia Greer1; 1California Institute of Technology
Nano-architected materials with extremely low densities have been shown to possess high stiffness, strength, or supersonic impact resilience and gravimetric energy absorption comparable to Kevlar composites (200-400 m/s particle velocity). Using a 3D laser interference lithography process (LIL) and a metasurface mask, we produce nano-architected sheets (35μm-thick and 2.5 x 2.5cm2 wide, 500nm internal feature size) made of negative tone epoxy-based photosensitive resist (SU-8) which are impregnated with an acetone-diluted epoxy matrix 65μm-thick to create 100μm-thick composites. Mechanical characterization via indentation on a dynamic mechanical analysis (DMA) machine and laser-induced particle impact testing (LIPIT) on composites and neat nano-architected sheets, respectively, demonstrated specific energy absorptions up to 5x higher than Kevlar composites. These results show that introducing an interpenetrated secondary epoxy matrix results in elevated load tolerance and toughening, thus providing insights into the contribution of nano-architected layers to energy absorption at various strain rates.