A5048370832- Additive Manufacturing Materials and Processes
- High Entropy Alloys Studies
- Welding Techniques and Residual Stresses
- Additive Manufacturing and 3D Printing Technologies
- Advancements in Battery Materials
- Metallic Glasses and Amorphous Alloys
- Advanced Battery Technologies Research
- Aluminum Alloys Composites Properties
- Aluminum Alloy Microstructure Properties
- Microstructure and Mechanical Properties of Steels
- High-Temperature Coating Behaviors
- Titanium Alloys Microstructure and Properties
- Advanced Battery Materials and Technologies
- Advanced Welding Techniques Analysis
- Advanced materials and composites
- Supercapacitor Materials and Fabrication
- Phase-change materials and chalcogenides
- Microstructure and mechanical properties
- Advanced ceramic materials synthesis
- X-ray Diffraction in Crystallography
- Advanced battery technologies research
- Machine Learning in Materials Science
- Advanced X-ray and CT Imaging
- Metal and Thin Film Mechanics
- Solidification and crystal growth phenomena
Argonne National Laboratory
2015-2025
Advanced Photonix (United States)
2020
Advanced Photon Source
2020
Alex's Lemonade Stand Foundation
2020
Johns Hopkins University
2020
University of Tennessee at Knoxville
2009-2012
National Tsing Hua University
2009-2011
Similar to conventional materials, most multicomponent high-entropy alloys (HEAs) lose ductility as they gain strength. In this study, we controllably introduced gradient nanoscaled dislocation cell structures in a stable single-phase HEA with face-centered cubic structure, thus resulting enhanced strength without apparent loss of ductility. Upon application strain, the sample-level structural induces progressive formation high density tiny stacking faults (SFs) and twins, nucleating from...
Coarse-grained materials are widely accepted to display the highest strain hardening and best tensile ductility. We experimentally report an attractive rate throughout deformation stage at 77 kelvin in a stable single-phase alloy with gradient dislocation cells that even surpasses its coarse-grained counterparts. Contrary conventional understanding, exceptional arises from distinctive dynamic structural refinement mechanism facilitated by emission motion of massive multiorientational tiny...
Solidification during fusion-based additive manufacturing (AM) is characterized by high solidification velocities and large thermal gradients, two factors that control the mode of metals alloys. Using synchrotron-based, in situ setups, we perform high-speed X-ray diffraction measurements to investigate impact gradients on a hot-work tool steel over wide range conditions relevance AM metals. The primary δ-ferrite observed at cooling rate 2.12 × 104 K/s, higher 1.5 106 suppressed, austenite...
An Al–Cu alloy micro-alloyed with Mn and Zr (ACMZ) was examined to understand the thermal stability strengthening mechanism of metastable θ'-Al2Cu precipitates interfacial segregation after prolonged exposure. The microstructure characterized at multiple scales techniques including synchrotron x-ray diffraction, scanning electron microscopy, transmission atom probe tomography. θ' did not exhibit measurable coarsening exposure 300°C for 5000 h. Kinetic effects segregation, which dominate over...
Achieving high energy density in all-solid-state lithium batteries will require the design of thick cathodes, and these need to operate reversibly under normal use conditions. We high-energy depth-profiling X-ray diffraction measure localized content Li1-xNi1/3Mn1/3Co1/3O2 (NMC111) through thickness 110 μm composite cathodes. The cathodes consisted NMC111 varying mass loadings mixed with argyrodite solid electrolyte Li6PS5Cl (LPSC). During cycling at C/10, substantial lithiation gradients...
X-ray diffraction is ideal for probing the sub-surface state during complex or rapid thermomechanical loading of crystalline materials. However, challenges arise as size volumes increases due to spatial broadening and because inability deconvolute effects different lattice deformation mechanisms. Here, we present a novel approach that uses combinations physics-based modeling machine learning deconvolve thermal mechanical elastic strains data analysis. The method builds on previous effort...
Abstract All solid‐state batteries are desirable for a range of energy storage applications which require high density. Achieving density in battery requires the operation an dense anode with composite cathode. Pores and/or voids within solid state cathode ion‐blocking and thus control over concentration distribution pores initial electrode cycled is desirable. This study provides understanding interplay between microstructure mechanics on active material utilization cathodes composed NCM...
The microstructures of Ti-6Al-4V following laser processing depend primarily on the phase transformation β to α, but their development is constrained by rapidly changing temperature in small fusion zone. In-situ synchrotron X-ray diffraction was utilized probe rapid evolution single melt tracks with high angular and temporal resolution. Both fully martensitic mixed α+α′+β were confirmed microscopy. Cooling rates inferred from lattice parameter history complementary thermal simulation. It...
The deformations of isotropic and anisotropic Ti-6Al-4V columnar structures fabricated by additive manufacturing were extensively examined. distinct texture microstructure distributions characterised. In situ X-ray diffraction measurements show different lattice activities resulting from the distributions. Spatially resolved mapping revealed manufacturing-induced crystallite-orientation that determine deformation mechanisms. We propose a self-consistent model to correlate multi-scale...
Abstract Alkaline Zn anodes are fundamental to commercial Zn-MnO2 batteries as well emerging rechargeable designs. In these electrodes, particles both the active material and source of electronic conduction. However, there known cases in which connectivity between or current collecting pin is lost even though battery continues function. Here we use X-ray computed tomography (CT) AA demonstrate several examples particle-to-particle breakdown, observed at relatively high discharge rate. This...
Liquid metal embrittlement (LME) is a longstanding problem for resistance spot welding (RSW) of Zn-coated automotive sheet steels, especially third generation advanced high-strength steels (AHSSs). This work designed multi-principal element alloy (MPEA), considered high entropy (HEA), that preferentially absorbs Zn during RSW and forms single solid solution phase. The MPEA composition was using highthroughput multi-physics-based analysis, which down-selected the FeMnNiCoZn system as...