A5038190148- Aluminum Alloy Microstructure Properties
- Aluminum Alloys Composites Properties
- Additive Manufacturing and 3D Printing Technologies
- Additive Manufacturing Materials and Processes
- Bauxite Residue and Utilization
- Material Properties and Applications
- Iron-based superconductors research
- Extraction and Separation Processes
- Advanced ceramic materials synthesis
- Rare-earth and actinide compounds
- High Entropy Alloys Studies
- Manufacturing Process and Optimization
- Anodic Oxide Films and Nanostructures
- Metal and Thin Film Mechanics
- Recycling and Waste Management Techniques
- Intellectual Capital and Performance Analysis
- Intermetallics and Advanced Alloy Properties
- Metallurgy and Material Forming
- Polymer Science and Applications
- Metal Extraction and Bioleaching
- Mechanical Failure Analysis and Simulation
- MXene and MAX Phase Materials
- Microstructure and mechanical properties
- Superconductivity in MgB2 and Alloys
- High-Temperature Coating Behaviors
Lawrence Livermore National Laboratory
2021-2023
University of Tennessee at Knoxville
2013-2021
Knoxville College
2020-2021
Oak Ridge National Laboratory
2015-2020
Oak Ridge Associated Universities
2017
A new class of castable cerium strengthened aluminum alloys has phenomenal high temperature properties without the need for heat treatment.
Decreasing microstructural length scales to the nanoscale is a proven way of increasing strength, but intrinsic metastability such structures typically makes them susceptible thermally activated coarsening. Recent advances in additive manufacturing permit bulk-nanostructured materials be produced through rapid solidification, like other metastable as-built coarsen rapidly with even modest thermal exposure. Here, selective laser melting employed produce an Al-Ce-based alloy high mechanical...
The suppression of magnetic order with pressure concomitant the appearance pressure-induced superconductivity was recently discovered in CrAs. Here we present a neutron diffraction study evolution helimagnetic ground state towards and vicinity superconducting phase. Neutron on polycrystalline CrAs employed from zero to 0.65 GPa at various temperatures. long-range is sustained under propagation vector does not show any considerable change. average ordered moment reduced 1.73(2)...
Aluminum 7075-T651 was printed by additive friction stir deposition (AFSD) onto 7075T651 substrate with one-directional passes to form a ∼190 mm wall ∼27 in height. Neutron residual stress mapping of the as-printed sample performed longitudinal (LD), transverse (TD), and normal (ND) directions build at midplane 6 LD x 3 TD ND voxels. These data were contextualized microhardness plastometry mapping, powder X-ray diffraction, electron backscatter scanning transmission microscopy. Peak tensile...
We use neutron scattering to study the effect of uniaxial pressure on tetragonal-to-orthorhombic structural ($T_s$) and paramagnetic-to-antiferromagnetic ($T_N$) phase transitions in NaFeAs compare outcome with similar measurements as-grown annealed BaFe$_2$As$_2$. In previous work BaFe$_2$As$_2$, necessary detwin sample was found induce a significant increase zero $T_N$ $T_s$. However, we find that used BaFe$_2$As$_2$ has very small their $T_s$.Since transport these samples still reveal...
We use polarized inelastic neutron scattering (INS) to study spin excitations in superconducting NaFe0.985Co0.015As (C15) with static antiferromagnetic (AF) order along the a-axis of orthorhombic structure and NaFe0.935Co0.045As (C45) without AF order. In previous unpolarized INS work, C15 were found have a dispersive sharp resonance near Er1=3.25 meV broad dispersionless mode at Er2=6 meV. Our polarization analysis reveals that is highly anisotropic a- c-axis, while isotropic similar C45....
London penetration depth, $\ensuremath{\lambda}(T)$, was measured in single crystals of ${\mathrm{K}}_{1\ensuremath{-}x}$${\mathrm{Na}}_{x}$${\mathrm{Fe}}_{2}$${\mathrm{As}}_{2}$, $x=0$ and 0.07, down to temperatures 50 mK, $\ensuremath{\sim}{T}_{c}/50$. Isovalent substitution Na for K significantly increases impurity scattering, with $\ensuremath{\rho}({T}_{c})$ rising from 0.2 2.2 $\ensuremath{\mu}\ensuremath{\Omega}$ cm, leads a suppression ${T}_{c}$ 3.5 2.8 K. At the same time, close...
Structural survivability of refractory multi-principal element alloys (RMPEAs) at high temperatures hinges on a combination microstructure, phase, and thermophysical stabilities. In this study, we investigate the high-temperature stability three compositions from CrMoNbV system: Cr7Mo18Nb35V40, Cr25Mo25Nb25V25, Cr40Mo45Nb10V5. The phase stability, coefficient thermal expansion (CTE), yield strength were evaluated up to 1300 oC. Results show that all as-cast have dendritic microstructures...
Direct reactive interface printing is a fused filament fabrication method that exploits specially designed alloys with chemistries and, in this example, structurally significant mechanical properties. Spatial control and fully molten stability are driven by high surface energy interfaces resulting from formation enthalpy. In study, Al–Ce-based deposited directly onto build where they rapidly solidify, retaining an intended shape, successive layers bond to one another through highly...
Engineering neutron diffraction can nondestructively and noninvasively probe stress, strain, temperature, phase evolutions deep within bulk materials. In this work, we demonstrate operando lattice strain measurement of internal combustion engine components by diffraction. A modified commercial generator was mounted in the VULCAN diffractometer at Spallation Neutron Source, strains both cylinder block head were measured under static nonfiring conditions as well steady state cyclic transient...
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