A5045344754- Additive Manufacturing Materials and Processes
- High Entropy Alloys Studies
- High-Temperature Coating Behaviors
- Additive Manufacturing and 3D Printing Technologies
- Microstructure and mechanical properties
- Microstructure and Mechanical Properties of Steels
- Advanced Materials Characterization Techniques
- Metallurgy and Material Forming
- Metal and Thin Film Mechanics
- Aluminum Alloys Composites Properties
- Advanced materials and composites
- Magnetic Properties and Applications
- Metallic Glasses and Amorphous Alloys
- Aluminum Alloy Microstructure Properties
- Metal Alloys Wear and Properties
- Intermetallics and Advanced Alloy Properties
- Titanium Alloys Microstructure and Properties
- Welding Techniques and Residual Stresses
- Manufacturing Process and Optimization
- Magnetic Properties of Alloys
- High Temperature Alloys and Creep
- Metal Forming Simulation Techniques
- High-Velocity Impact and Material Behavior
- Diamond and Carbon-based Materials Research
- Laser and Thermal Forming Techniques
Sandia National Laboratories California
2018-2024
Sandia National Laboratories
2017-2024
Purdue University West Lafayette
2014-2016
Materials Processing (United States)
2015
Colorado State University
2011-2012
Recent work suggests that thermally stable nanocrystallinity in metals is achievable several binary alloys by modifying grain boundary energies via solute segregation. The remarkable thermal stability of these has been demonstrated recent reports, with many exhibiting negligible growth during prolonged exposure to near-melting temperatures. Pt-Au, a proposed alloy consisting two noble metals, shown exhibit extraordinary resistance wear. Ultralow wear rates, less than monolayer material...
Abstract We present evidence of inverse Hall-Petch behavior for a single-phase high entropy alloy (CoCrFeMnNi) in ultra-high vacuum and show that it is associated with low friction coefficients (~0.3). Grain size measurements by STEM validate recently proposed dynamic amorphization model accurately predicts grain size-dependent shear strength the regime. Wear rates initially soft (coarse grained) material were shown to be remarkably (~10 –6 mm 3 /N-m), lowest any HEA tested an inert...
High-Entropy Alloys (HEAs) are proposed as materials for a variety of extreme environments, including both fission and fusion radiation applications. To withstand these harsh processing must be tailored to their given application, now achieved through additive manufacturing processes. However, application opportunities remain limited due an incomplete understanding the effects irradiation on HEA performance. In this letter, we investigate response additively manufactured refractory...
We demonstrate inverse Hall-Petch behavior (softening) in pure copper sliding contacts at cryogenic temperatures. By kinetically limiting grain growth, it is possible to generate a quasi-stable ultra-nanocrystalline surface layer with reduced strength. In situ electrical contact resistance measurements were used determine size evolution the interface, agreement reports of softening highly nanotwinned copper. also show evidence direct correlation between and friction coefficient, validating...
Refractory complex concentrated alloys are an emerging class of materials that attracts attention due to their stability and performance at high temperatures. In this study, we investigate the variations in mechanical thermal properties across a broad compositional space for refractory MoNbTaTi quaternary using high-throughput ab-initio calculations experimental characterization. For all surveyed, note good agreement between our modeling predictions experimentally measured values. We reveal...
Advancing the understanding of microstructural effects and deformation on degradability Fe-Mn bioresorbable alloys (specifically, Fe-33%Mn) will help address current problems associated with designing degradable fracture fixation implants for hard tissues. Potentiostatic polarization tests were conducted a wide variety metal samples to examine how different processes affect instantaneous rate degradation alloys. Large-strain machining (LSM), novel severe plastic (SPD) technique was utilized...