A5012384531- Metal and Thin Film Mechanics
- Microstructure and mechanical properties
- Aluminum Alloys Composites Properties
- nanoparticles nucleation surface interactions
- Fusion materials and technologies
- Advanced materials and composites
- Aluminum Alloy Microstructure Properties
- Copper Interconnects and Reliability
- Nuclear Materials and Properties
- Nuclear materials and radiation effects
- High Entropy Alloys Studies
- Solidification and crystal growth phenomena
- Block Copolymer Self-Assembly
- Advanced ceramic materials synthesis
- High-Temperature Coating Behaviors
- Additive Manufacturing and 3D Printing Technologies
- Advanced Condensed Matter Physics
- Additive Manufacturing Materials and Processes
- Electronic and Structural Properties of Oxides
- 2D Materials and Applications
- Powder Metallurgy Techniques and Materials
- Microwave Dielectric Ceramics Synthesis
- Metal Forming Simulation Techniques
- Semiconductor materials and devices
- Metal Alloys Wear and Properties
Center for Integrated Nanotechnologies
2020-2025
Los Alamos National Laboratory
2020-2025
University of Michigan–Ann Arbor
2016-2021
Arizona State University
2019
Texas A&M University
2019
The microstructures and mechanical behavior of high-temperature co-sputtered Cu/Mo nanocomposites were investigated compared with multilayers. present hierarchical architectures bicontinuous intertwined phases, the feature size which can be tuned from 35 to 3 nm by changing deposition parameters. After indentation, shear bands found in multilayers but not nanocomposites. In situ nanocompression tests Transmission electron microscopy showed that nanocomposite containing fine-length-scale...
Refractory High-Entropy Alloys (RHEAs) are promising candidates for structural materials in nuclear fusion reactors, where W-based alloys currently leading. Fusion must withstand extreme conditions, including i) severe radiation damage from energetic neutrons, ii) embrittlement due to H and He ion implantation, iii) exposure high temperatures thermal gradients. Recent RHEAs, such as WTaCrV WTaCrVHf, have shown superior tolerance microstructural stability compared pure W, but their...
With the advent of additive manufacturing, manipulation typical microstructural elements such as grain size, texture, and defect densities is now possible at a faster time scale. While processing–structure–property relationship in manufactured metals has been well studied over past decade, little work done understanding how this process affects dynamic behavior materials. We postulate that manufacturing can be used to alter material microstructure enhance its strength. In work, 316L...
We demonstrate design of Cu/Mo nanocomposite thin films with bicontinuous intertwined morphologies for high strength and plastic deformability. Through co-sputtering Cu Mo at different temperatures, nanocomposites lateral random concentration modulations (LCMs RCMs) were fabricated. Ligament size coherency the interfaces was also controlled via deposition conditions. It discovered that LCM structure coherent have but limited Enhanced deformability achieved when interface altered to...
High-entropy alloy (HEA) design strategies have been limited to theoretical/computational approaches due their compositional complexity and extremely large parameter space. In this work, we developed an experimentally driven, high-throughput, HEA approach using a physical vapor deposition (PVD) technique coupled it with nanomechanical testing accelerate material for structural applications. The PVD enabled the formation of gradient across thin-film sample. Specifically, 10 cm wafer was used...
A new processing route has been discovered through which far-from-equilibrium, metastable architectures with unprecedented properties are synthesized. This novel architecture contains many orders of hierarchy multiple concentration modulation wavelengths. At one length scale, the matrix is comprised lateral modulations BCC Mo and pseudomorphic Cu a wavelength 10 nm. FCC, Cu-rich islands approximate 250 nm diameter woven in-between Mo-Cu contain ordered arrays pseudomorphic, Mo-rich, coherent...
We use 3D phase-field simulations to investigate the role of deposition rates and atomic mobilities on morphological self-structuring in phase-separating, vapor-deposited alloys. Our numerical predict three distinct nanocomposite morphologies: vertical composition modulations (VCMs), lateral (LCMs), random modulations. also observed a transitional region between VCM LCM that exhibits coexistence features drawn from both morphologies. compare these results with experiments carried out...
Additive manufacturing has the potential to repair damaged parts, but performance of additive materials under high strain rate loading is still uncertain—especially with added complexity an interface existing wrought material. In this work, 304L stainless steel samples were intentionally and then repaired wire-fed laser manufacturing. The subjected shock generate incipient spall. Velocimetry post-mortem metallography results show that when process parameters are optimized reduce porosity...
Co-deposited, immiscible alloy systems form hierarchical microstructures under specific deposition conditions that accentuate the difference in constituent element mobility. The mechanism leading to formation of these unique morphologies during process is difficult identify, since characterization typically carried out post-deposition. We employ phase-field modeling study evolution combined with microscopy experimentally deposited thin films reveal origin co-deposited, films. Our results...
Heterogeneous microstructures in Cu-Mo-W alloy thin films formed by magnetron co-sputtering immiscible elements with concentrated compositions are characterized using scanning transmission electron microscopy (STEM) and nanoindentation. In this work, we modified the phase separated structure of a Cu-Mo system adding W, which impedes surface diffusion during film growth. The heterogeneous ternary exhibited bicontinuous matrices agglomerates composed Mo(W)-rich phase. This is unique, as these...
Abstract In this work, we investigated the effects of alloying elements on plastic deformation and microstructure evolution in polycrystalline copper (Cu) Cu alloyed with 1 wt. $$\%$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mo>%</mml:mo> </mml:math> lead (Cu-1 Pb). These materials were selected due to size mismatch between Pb, latter forming precipitates at grain boundaries. Multi-modal characterization techniques, including neutron diffraction, electron backscatter...