Article
Nanoscience & Nanotechnology
Hu Zhao, Halil Yilmaz, Craig J. Williams, Alexander S. Eggeman, Brian Derby
Summary: The study compares the tensile mechanical properties of silver nanowires produced by different methods and finds a significant size effect in the plastic flow strengths of both sets of nanowires, where smaller diameters result in higher strengths. Similar deformation structures and low dislocation densities were observed in both classes of nanowires studied.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Kirill A. Bokai, Viktor O. Shevelev, Dmitry Marchenko, Anna A. Makarova, Vladimir Yu Mikhailovskii, Alexei A. Zakharov, Oleg Yu Vilkov, Maxim Krivenkov, Denis V. Vyalikh, Dmitry Yu Usachov
Summary: Intercalation of oxygen can facilitate the detection of grain boundaries in polycrystalline graphene, providing insights into their morphology, and enabling visualization through various electron microscopy methods.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
A. J. Egan, F. Xue, Y. Rao, G. Sparks, E. Marquis, M. Ghazisaeidi, S. Tin, M. J. Mills
Summary: This study investigates the effect of Nb content on local phase transformation strengthening during high temperature creep in two similar polycrystalline alloys. The results show that the alloy with higher Nb content exhibits superior creep strength. Characterization of the deformation microstructures and density functional theory calculations reveal that a novel local phase transformation along microtwin interfaces plays a key role in enhancing the creep strength.
Article
Nanoscience & Nanotechnology
Sung Bo Lee, Seung Jo Yoo, Jinwook Jung, Heung Nam Han
Summary: The irradiation of high-energy particles can affect the grain-boundary structure of polycrystalline nuclear materials, with different reactions observed for different grain-boundary characteristics. By examining different types of grain boundaries in a model system, it was found that tilt boundaries became roughened while twist boundaries became faceted under the same irradiation conditions.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Multidisciplinary
Zixiang Yan, Qiang Yang, Fanzhi Meng, Rui Ma, Rirong Bao, Xiaojuan Liu, Jian Meng, Xin Qiu
Summary: In this study, interfacial precipitation in {10 (1) over bar2} twin boundaries of a cold-stamped Mg-12Gd-1.2Zn-0.4Zr alloy was investigated, revealing the formation of new interfacial phases which accelerated peak-aging and improved the alloy's strength. This periodic segregation of Gd + Zn atoms in the twin boundaries played a crucial role in enhancing the mechanical properties of the alloy.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Kunyen Liao, Kiyou Shibata, Teruyasu Mizoguchi
Summary: Grain boundaries significantly affect the coefficient of thermal expansion in polycrystals. This study used EELS to directly measure CTE in different types of grain boundaries, revealing variations in thermodynamic properties and demonstrating the potential of EELS for probing local thermal properties at nanometer-scale resolution.
Article
Materials Science, Multidisciplinary
Xiaochen Li, Haibo Long, Jianfei Zhang, Dongfeng Ma, Deli Kong, Yan Lu, Shiduo Sun, Jixiang Cai, Xiaodong Wang, Lihua Wang, Shengcheng Mao
Summary: This study used in situ TEM observations to directly reveal dislocation nucleation at grain boundaries in nanocrystalline metals. The findings contradict the common hypothesis predicted by molecular dynamic simulations, showing that complete dislocations can be emitted from grain boundaries in small-grained structures.
MATERIALS CHARACTERIZATION
(2021)
Article
Chemistry, Multidisciplinary
James A. Quirk, Bin Miao, Bin Feng, Gowoon Kim, Hiromichi Ohta, Yuichi Ikuhara, Keith P. McKenna
Summary: An experimental and theoretical study of anatase grain boundaries fabricated by epitaxial growth on a bicrystalline substrate provides accurate atomic-scale models. The electronic structure in the vicinity of stoichiometric grain boundaries is relatively benign to device performance, but segregation of oxygen vacancies introduces barriers to electron transport. An intrinsically oxygen-deficient boundary exhibits charge trapping consistent with electron energy loss spectroscopy measurements.
Article
Materials Science, Multidisciplinary
Qi Zhu, Qishan Huang, Haofei Zhou, Jiangwei Wang
Summary: This study reveals the fundamental influences of GB inclination on the deformation of curved dislocation-type GBs in face-centered cubic metals through in situ TEM nanomechanical testing and atomistic simulation. A inclination-governed GB model is established to predict the deformation behaviors of curved GBs, shedding light on the GB-mediated plasticity and the structural design of metallic materials.
JOURNAL OF MATERIALS RESEARCH
(2021)
Article
Chemistry, Physical
Artem M. Abakumov, Chen Li, Anton Boev, Dmitry A. Aksyonov, Aleksandra A. Savina, Tatiana A. Abakumova, Gustaaf Van Tendeloo, Sara Bals
Summary: High-energy lithium-rich layered transition metal oxides exhibit complex electrochemical behavior due to interactions between crystal, electronic, and defect structures. This study reveals that grain boundary microstructures, particularly Na-enriched regions, have a significant impact on the rate capability of Li-rich cathodes, affecting the diffusion of Li+ ions.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Rebecca C. Miller, Roy H. Geiss, Amy L. Prieto
Summary: Understanding the microstructure of complex crystal structures is crucial for controlling material properties in next-generation devices. In this study, a synthetic route to controllably twinned olivine nanoparticles was reported, with microstructural characterization of Fe2GeS4 nanoparticles demonstrating the formation of triplets of twins. The work highlights the potential for future exploration in solution-phase synthetic approaches to control microstructure in compositionally complex, technologically relevant structures.
Article
Materials Science, Multidisciplinary
Qingqing Wang, Chaoyang Niu, Zhanqiang Liu, Yanqing Wang, Yanhai Cheng, Yongkang Cui
Summary: The hardening mechanisms of deformation twins in the machined surface of Ti-6Al-4V alloy were investigated. It was found that increasing cutting speeds led to different levels of grain refinement and the generation of nano twins. Both grain refinement and nano twins caused inhomogeneous hardening in the machined surface of Ti-6Al-4V.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Genki Tsukamoto, Tomonori Kunieda, Shigeto Yamasaki, Masatoshi Mitsuhara, Hideharu Nakashima
Summary: The study investigated the effects of grain boundary, grain size, and deformation temperature on twinning deformation in polycrystalline commercially pure titanium. Different twinning systems were observed at different deformation temperatures and grain sizes, indicating the complex interplay between these factors in twinning deformation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Yizhong Guo, Jiao Teng, Guo Yang, Ang Li, Yao Deng, Chengpeng Yang, Lihua Wang, Xin Yan, Ze Zhang, Xiaoyan Li, En Ma, Xiaodong Han
Summary: Detailed monitoring of atomic-scale processes is crucial for understanding grain rotation in nanocrystalline metals. In this study, in situ atomic-resolution evidence reveals that the type of grain boundary plays a role in the atomic processes involved in grain rotation in nanocrystalline Pt. General GBs exhibit a combination of dislocation activities and atomic rearrangements, while tilt GBs mostly rely on dislocation activities. GB dislocation climb, glide, and reaction are often associated with Lomer-like dislocation formation and destruction.
Article
Chemistry, Multidisciplinary
Danielle Reifsnyder Hickey, Nadire Nayir, Mikhail Chubarov, Tanushree H. Choudhury, Saiphaneendra Bachu, Leixin Miao, Yuanxi Wang, Chenhao Qian, Vincent H. Crespi, Joan M. Redwing, Adri C. T. van Duin, Nasim Alem
Summary: The study investigates the crystal growth mechanisms and defect formation of WS2, revealing its microstructure and orientation characteristics through electron microscopy imaging and molecular dynamics simulations. It reveals the relationship between defects and grain boundaries, as well as the tilting of the film when released from the substrate. Statistical analysis reveals that microstructural features are constructed from nanometer-scale building blocks, describing the system across length scales from sub-Angstrom to multimicrometer.
Article
Engineering, Mechanical
G. Zhou, D. T. Fullwood, J. D. Carroll, E. R. Homer, H. Lim, R. H. Wagoner
Summary: The study observed the predicted yield point phenomena in Ta single crystals, which were influenced by crystal orientation and boundary conditions. Experimental data matched simulation results, confirming the existence of the internal stress mechanism. The internal stress mechanism may operate concurrently with strain aging or individually.
JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY-TRANSACTIONS OF THE ASME
(2022)
Article
Engineering, Industrial
Stanley Bovid, Micheal Kattoura, Allan Clauer, Anupam Vivek, Glenn Daehn, Stephen Niezgoda
Summary: The study found that using adhesive-backed overlays can increase peak pressures in laser shock peening, and the temporal characteristics are independent of the laser pulse width. A novel analytical model to predict shockwave pressures was proposed and validated with experimental data.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2022)
Editorial Material
Engineering, Electrical & Electronic
Mary Comer, Jeff Simmons, Steve Niezgoda, Charles A. Bouman, Benjamin Berkels
IEEE SIGNAL PROCESSING MAGAZINE
(2022)
Article
Materials Science, Multidisciplinary
Supriyo Chakraborty, Chaitali S. Patil, Stephen R. Niezgoda
Summary: The evolution of cube component in medium to high stacking-fault energy FCC metals during deformation was studied, revealing that some non-cube grains also developed the cube component during deformation, but it became unstable and rotated away from the cube orientation with increasing strain.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
David T. Fullwood, Sarah Sanderson, Sterling Baird, Jordan Christensen, Eric R. Homer, Oliver K. Johnson
Summary: This study uses the concept of transition curves to address the issue of determining geometric shapes from EBSD data in small crystalline materials. It also proposes criteria for comparing experimental and simulated curves. The study shows that there is a significant error in determining the position of grain boundaries using traditional EBSD software.
MICROSCOPY AND MICROANALYSIS
(2022)
Article
Engineering, Mechanical
Sowmya Daroju, Toshihiko Kuwabara, Rishabh Sharma, David T. Fullwood, Michael P. Miles, Marko Knezevic
Summary: The contribution of microstructural-level phenomena to reverse loading behavior in metal alloys is still an active and debated area of research. Accurate prediction of nonlinear effects, the Bauschinger effect, and changes in hardening rates during reverse loading is necessary for modeling deformation and springback in forming operations. This study applied a crystal plasticity model to predict and interpret reverse loading in two aluminum alloys, revealing the contribution of different microscale phenomena.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Mechanics
Rishabh Sharma, Dane Sargeant, Sowmya Daroju, Marko Knezevic, Michael P. Miles, David T. Fullwood
Summary: This study assesses the performance of the EPSC model in predicting the deformation response of AA6016-T4 alloy under different strain paths. The results show that the EPSC model accurately predicts the stress-strain behavior of the material and the inclusion of backstresses significantly improves the prediction accuracy.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Metallurgy & Metallurgical Engineering
H. K. Mehtani, M. Khan, P. Raut, S. Parida, M. J. N. Prasad, D. Fullwood, R. D. Doherty, I Samajdar
Summary: This study demonstrates that the resistance to oxidation of iron can be significantly improved by alloying with copper or phosphorous. The binary alloys with copper or phosphorous showed a bcc ferrite structure and maintained a specific crystallographic relationship with the oxide phase. The epitaxial growth of the oxide film introduced dislocations, residual stress, and misfit strain, which were reduced with an increase in copper or phosphorous content.
OXIDATION OF METALS
(2022)
Article
Engineering, Mechanical
Jiarui Kang, Xun Liu, Stephen R. Niezgoda
Summary: This study proposes a novel approach to model the ultrasonic softening effect during metal plasticity and develops a directional softening model. Calibrated and validated with experimental data of pure copper, the model reveals that the stress reduction during ultrasonic softening is not homogeneous in the whole aggregate but depends on grain orientation, with higher level of softening observed in plastically hard, high Taylor factor grains.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Materials Science, Multidisciplinary
Landon T. Hansen, Jay D. Carroll, Eric R. Homer, Robert H. Wagoner, Guowei Zhou, David T. Fullwood
Summary: This study examines the distribution of geometrically necessary dislocations (GNDs) in pure tantalum under simple tension using high-resolution electron backscatter diffraction. The correlations between GND density and grain boundary character, as well as triple junction character, are investigated. A novel application of two-point statistics is used to quantify and visualize the statistical geometric relationships between these entities. The mapping and assessment of the local net Burgers vectors across the sample are also conducted using a recently developed method. The quantification of near boundary gradient zones is compared using different approaches to characterize GND distribution.
MICROSCOPY AND MICROANALYSIS
(2023)
Article
Anesthesiology
Spencer A. Baker, Darci A. Billmire, R. Adam Bilodeau, Darian Emmett, Andrew K. Gibbons, Ulrike H. Mitchell, Anton E. Bowden, David T. Fullwood
Summary: Chronic low back pain (cLBP) is a common and multifactorial ailment, and there is currently no single treatment that has been proven to significantly improve outcomes for all patients. The development of the SPINE Sense System, a wearable array of nanocomposite stretch sensors, provides a tool for accurately capturing lumbar spinal kinematics. This system allows for the identification of movement-based phenotypes and the analysis of correlations between spinal kinematics and patient-reported outcomes.
Review
Engineering, Manufacturing
Javier Vazquez-Armendariz, Luis H. Olivas-Alanis, Tobias Mahan, Ciro A. Rodriguez, Michael Groeber, Stephen Niezgoda, Jonathan M. Morris, Hany Emam, Roman Skoracki, Jian Cao, Beth Ripley, Joseph Iaquinto, Glenn Daehn, David Dean
Summary: Currently, POCM is mainly performed at advanced medical centers for the production of 3D printed anatomic models and surgical guides. It is highly important to ensure safe and effective POCM for personalized interventions in cardiac, trauma, cancer resection/radiosurgery, and neurological surgery. Patient awareness has increased the demand for personalized procedure planning, surgical guides, and implantable devices, which can be achieved through workflows that incorporate MM, HAM, and ICME. This article discusses a preliminary design and testing of a workflow for personalized mandibular graft fixation hardware.
INTEGRATING MATERIALS AND MANUFACTURING INNOVATION
(2023)
Article
Engineering, Manufacturing
Rohan Casukhela, Sriram Vijayan, Joerg R. Jinschek, Stephen R. Niezgoda
Summary: This paper outlines a framework for designing and selecting data collection workflows for autonomous experimentation systems. The framework was applied to select an optimal high-throughput workflow for characterizing a material sample using a deep-learning based image denoiser.
INTEGRATING MATERIALS AND MANUFACTURING INNOVATION
(2022)
Article
Multidisciplinary Sciences
Sterling G. Baird, Eric R. Homer, David T. Fullwood, Oliver K. Johnson
Summary: This paper presents a method for efficient barycentric interpolation of large grain boundary octonion point sets on the surface of a hypersphere. The method involves the removal of degenerate dimensions, determination of intersecting facets, and interpolation. It is applicable to hyperspherical point sets in various applications such as grain boundary structure-property models, robotics, and specialized neural networks.
Proceedings Paper
Electrochemistry
Dane Sargeant, Md Zahidul, Rishabh Sharma, Marko Kenezevic, David T. Fullwood, Michael P. Miles
Summary: This study investigates the springback levels in AA6016-T4 sheet after pure bending operations using finite element modeling. The results show that the elasto-plastic self-consistent (EPSC) crystal plasticity approach provides more accurate predictions and analysis.
