12 citations · 30 across the 23 of their papers we have counts for
23 papers
Stress field modification near linear complexions increases the effective obstacle size and strengthening effect
Zhengyu Zhang, Daniel S. Gianola, Timothy J. Rupert
Linear complexions are stable defect states that form along dislocations and recent experiments have demonstrated strengthening effects exceeding classical precipitation hardening…
Thicker amorphous grain boundary complexions reduce plastic strain localization in nanocrystalline Cu-Zr
Esther C. Hessong, Nicolo Maria della Ventura, Tongjun Niu +6
Amorphous grain boundary complexions have been shown to increase the plasticity of nanocrystalline alloys as compared to ordered grain boundaries. Here, the effect of an important…
A MAPS Detector for High Resolution Low Dose EBSD
Barnaby D. A. Levin, Kalani Moore, Nicolò M. Della Ventura +3
The use of highly sensitive pixelated direct detectors has dramatically improved the performance of high energy instrumentation such as transmission electron microscopy. Here, we d…
Fast nanothermometry based on direct electron detection of electron backscattering diffraction patterns
Ryan Gnabasik, Razan O. Nughays, Ashlynn Overholser +5
Accurate temperature measurement at the nanoscale is crucial for thermal management in next-generation microelectronic devices. Existing optical and scanning-probe thermometry tech…
Energy-Resolved EBSD using a Monolithic Direct Electron Detector
Nicolò M. Della Ventura, Kalani Moore, McLean P. Echlin +4
Accurate quantification of the energy distribution of backscattered electrons (BSEs) contributing to electron backscatter diffraction (EBSD) patterns remains as an active challenge…
Kinetics of Amorphous Defect Phases Measured Through Ultrafast Nanocalorimetry
W. Streit Cunningham, Tianjiao Lei, Hannah C. Howard +2
Recognition of the role of extended defects on local phase transitions has led to the conceptualization of the defect phase, localized thermodynamically stable interfacial states t…
Enhanced strain rate sensitivity due to platelet linear complexions in Al-Cu
Pulkit Garg, Daniel S. Gianola, Timothy J. Rupert
Platelet array linear complexions have been predicted in Al-Cu, with notable features being dislocation faceting and climb into the precipitate, both of which should impact plastic…
Orientation-Adaptive Virtual Imaging of Defects using EBSD
Nicolò M. della Ventura, James D. Lamb, William C. Lenthe +8
EBSD is a foundational technique for characterizing crystallographic orientation, phase distribution, and lattice strain. Embedded within EBSD patterns lies latent information on d…
Bulk nanocrystalline Al-Mg-Y alloys with amorphous grain boundary complexions display high strength and compressive plasticity
Tianjiao Lei, Esther Hessong, Brandon Fields +3
Although nanocrystalline alloys regularly exhibit high strengths, their use in structural applications often face challenges due to sample size limitations, unstable microstructure…
High-throughput assessment of the microstructural stability of segregation-engineered nanocrystalline Al-Ni-Y alloys
W. Streit Cunningham, Jungho Shin, Tianjiao Lei +2
Segregation engineering has emerged as a promising pathway towards designing thermally stable nanocrystalline alloys with enhanced mechanical properties. However, the compositional…
Strengthening from dislocation restructuring and local climb at platelet linear complexions in Al-Cu alloys
Pulkit Garg, Daniel S. Gianola, Timothy J. Rupert
Stress-driven segregation at dislocations can lead to structural transitions between different linear complexion states. In this work, we examine how platelet array linear complexi…
Dislocation breakaway from nanoparticle array linear complexions: Plasticity mechanisms and strength scaling laws
Divya Singh, Daniel S. Gianola, Timothy J. Rupert
Linear complexions are stable defect states, where the stress field associated with a dislocation induces a local phase transformation that remains restricted to nanoscale dimensio…
Binary nanocrystalline alloys with strong glass forming interfacial regions: Complexion stability, segregation competition, and diffusion pathways
Tianjiao Lei, Esther C. Hessong, Daniel S. Gianola +1
Stabilization of grain structure is important for nanocrystalline alloys, and grain boundary segregation is a common approach to restrict coarsening. Doping can alter grain boundar…
Inducing Skyrmion Flop Transitions in CoZnMn at Room Temperature
Simon A. Meynell, Yolita M. Eggeler, Joshua D. Bocarsly +9
Magnetic skyrmions are topologically-protected spin textures that manifest in certain non-centrosymmetric ferromagnets under the right conditions of temperature and field. In thin…
Linear complexions directly modify dislocation motion in face-centered cubic alloys
Divya Singh, Vladyslav Turlo, Daniel S. Gianola +1
Linear complexions are defect phases that form in the presence of dislocations and thus are promising for the direct control of plasticity. In this study, atomistic simulations are…
Intermetallic particle heterogeneity controls shear localization in high-strength nanostructured Al alloys
Tianjiao Lei, Esther C. Hessong, Jungho Shin +2
The mechanical behavior of two nanocrystalline Al alloys, Al-Mg-Y and Al-Fe-Y, is investigated with in-situ micropillar compression testing. Both alloys were strengthened by a hier…
Growth and structural transitions of core-shell nanorods in nanocrystalline Al-Ni-Y
Tianjiao Lei, Mingjie Xu, Jungho Shin +2
Unique nanorod precipitates with a core-shell structure are found to nucleate from the grain boundaries of a bulk nanocrystalline Al-Ni-Y alloy fabricated via powder consolidation,…
Bulk nanocrystalline Al alloys with hierarchical reinforcement structures via grain boundary segregation and complexion formation
Tianjiao Lei, Jungho Shin, Daniel S. Gianola +1
Grain size engineering, particularly reducing grain size into the nanocrystalline regime, offers a promising pathway to further improve the strength-to-weight ratio of Al alloys. U…
Electron Backscattered Diffraction using a New Monolithic Direct Detector: High Resolution and Fast Acquisition
Fulin Wang, McLean P. Echlin, Aidan A. Taylor +6
A monolithic active pixel sensor based direct detector that is optimized for the primary beam energies in scanning electron microscopes is implemented for electron back-scattered d…
New techniques for imaging and identifying defects in electron microscopy
Daniel S. Gianola, T. Ben Britton, Stefan Zaefferer
Defects in crystalline materials control the properties of materials, and their characterization focuses our strategies to optimize performance. Electron microscopy has served as t…
Flexible Conductive Composites with Programmed Electrical Anisotropy Using Acoustophoresis
Drew S. Melchert, Rachel R. Collino, Tyler R. Ray +4
3D printing mechanically flexible composite materials with high electrical conductivity is currently hindered by the need to use high loading of conductive filler, which severely l…
Robust Scaling of Strength and Elastic Constants and Universal Cooperativity in Disordered Colloidal Micropillars
Daniel J. Strickland, Yun-Ru Huang, Daeyeon Lee +1
We study the uniaxial compressive behavior of disordered colloidal free-standing micropillars composed of a bidisperse mixture of 3 and 6 um polystyrene particles. Mechanical annea…
Extremely Low Drift in Amorphous Phase Change Nanowire Materials
Mukut Mitra, Yeonwoong Jung, Daniel S. Gianola +1
Time-dependent drift of resistance and threshold voltage in phase change memory (PCM) devices is of concern as it leads to data loss. Electrical drift in amorphous chalcogenides ha…