Article
Chemistry, Physical
Jiahao Li, Kejie Lu, Yi Wang, Yuqi Zhang, Xinkai Ma, Jieming Chen, Yuntian Zhu
Summary: This work investigates the fabrication of nanotwinned Al0.1CoCrFeNi high-entropy alloy (HEA) using cryogenic multi-directional compression (CMC) followed by stress-relief annealing, and demonstrates the enhanced cryogenic tensile properties of the nanotwinned HEA. The introduction of high-density dislocations and hierarchical nanotwins in the HEA samples contributes to the excellent mechanical performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Multidisciplinary Sciences
Shuo Zhou, Antoinette Tordesillas, Mehdi Pouragha, James Bailey, Howard Bondell
Summary: The study introduces a new metric called s-LID to identify and quantify hierarchies of kinematic patterns in heterogeneous media. Results show that the evolution of failure in deforming granular materials is governed by a complex symbiosis among different coexisting structures, with particle rotation playing an essential role in the transition to the shearband-dominated regime.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Geological
Tyler J. J. Oathes, Ross W. W. Boulanger
Summary: A numerical study was conducted to investigate the effects of viscoplasticity on localization processes in sensitive clays and plastic silts. The study employed a viscoplastic constitutive model to simulate laboratory specimens under monotonic, undrained, direct simple shear loading. Parametric analyses were performed to assess the influence of soil sensitivity, strain-softening rate, strain rate dependency, specimen size, mesh discretization, and loading rate. The results showed that the strain rate dependency of the soil's shearing resistance relative to its rate of postpeak strain softening primarily determines the global strain at which localization occurs. A regression model relating the onset of localization to the soil's strain rate dependency and postpeak strain-softening rate was proposed. The findings indicate that the inclusion of reasonable levels of viscoplasticity increases the strain development before localization in clays and plastic silts.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2023)
Article
Computer Science, Interdisciplinary Applications
Eleni Gerolymatou, Julia Leuthold
Summary: This study investigates the oedometric compaction of materials with collapsible structure from a numerical point of view and finds that the reduction in permeability following the formation of compaction bands can be highly anisotropic. By using the finite element method and implementing a nonlocal formulation, the numerical stability issue caused by the localization of deformation is resolved.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Multidisciplinary Sciences
Shiteng Zhao, Zezhou Li, Chaoyi Zhu, Wen Yang, Zhouran Zhang, David E. J. Armstrong, Patrick S. Grant, Robert O. Ritchie, Marc A. Meyers
Summary: High-entropy alloys (HEAs) show remarkable material properties under harsh conditions, with structures containing stacking faults, twins, transformation between crystal structures, and amorphization being generated through plastic deformation processes.
Article
Materials Science, Multidisciplinary
Jingya Wang, Yiwen Chen, Zhe Chen, Javier Llorca, Xiaoqin Zeng
Summary: The effect of Ca and Zn in solid solution on the critical resolved shear stress (CRSS) of different slip systems in Mg alloys was investigated, revealing changes in plastic anisotropy and twin growth. The results showed that the addition of solute atoms increased the CRSS for basal slip and decreased the CRSS for pyramidal slip, leading to improved ductility and formability in the Mg-Ca-Zn alloys.
Article
Physics, Multidisciplinary
Lars Blatny, Paul Berclaz, Francois Guillard, Itai Einav, Johan Gaume
Summary: Porous rocks, foams, cereals, and snow exhibit common compaction patterns, such as propagating or stationary bands. By using a generic model of inelastic structured porous geometries, researchers have shown that these patterns are attributed to a universal process of pore collapse. The pattern diversity can be described by two dimensionless numbers representing material strength and loading rate.
PHYSICAL REVIEW LETTERS
(2022)
Article
Mechanics
Brian Nyvang Legarth, Viggo Tvergaard
Summary: Pre-existing voids distributed in inclined layer represent material defects leading to void growth and strain localization. A finite element framework is used to account for small elastic but finite plastic strain deformations in an anisotropic material hardening. Three different materials with anisotropic yield surface are considered and compared with an isotropic Mises case. The responses of the anisotropic sheets are similar to the isotropic case, except for a simple shift of the critical strain level at localization.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Y. Kalchev, R. Zehl, T. Piotrowiak, A. Kostka, D. Naujoks, J. Pfetzing-Micklich, A. Ludwig
Summary: The microstructure and local micromechanical properties of a Ni-based superalloy thin film produced by magnetron sputtering were investigated. The thin film consisted of columnar nanograins with mostly <111> orientation and fine nanotwins inside the nanograins. The mechanical characteristics were evaluated through micropillar compression tests, with the thin film exhibiting high microhardness and Young's modulus.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Engineering, Geological
Chara Prassa, Sotiris Alevizos, Manolis Veveakis, Yannis F. Dafalias
Summary: Compaction bands are localized failure patterns that appear in highly porous rock material under the effect of relatively high confining pressure. The study focused on the mechanism leading to the onset of compaction bands using a viscoplasticity model, showing that isotropic hardening promotes compaction localization while rotational hardening has a slightly negative effect on the onset of compaction localization.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2022)
Article
Metallurgy & Metallurgical Engineering
Yan-qiu ZHANG, Shu-yong JIANG
Summary: Through MD simulation, it was found that nanotwinned polycrystalline copper with {111} texture exhibits hard and soft orientations during tensile deformation, each involving distinct dislocation mechanisms. The strengthening mechanism of hard orientation is attributed to interactions between dislocations and twin boundaries, while the softening mechanism of soft orientation is due to the lack of interaction between dislocations and twin boundaries.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2021)
Article
Physics, Multidisciplinary
Andreas Sinner, Pierre A. Pantaleon, Francisco Guinea
Summary: We investigate the impact of strain on honeycomb lattice moire' systems. Our research explains the formation of nearly perfect one-dimensional moire' patterns in twisted bilayer systems. The formation of these patterns results from the interplay between twist and strain, which leads to the collapse of the reciprocal space unit cell. We establish a simple relationship between two quantities and the material specific Poisson ratio as a criterion for this collapse. The induced one-dimensional behavior is characterized by two usually incommensurate periodicities. Our findings provide explanations for the complex patterns of one-dimensional channels observed in low angle twisted bilayer graphene systems and twisted bilayer dicalcogenides. This research can be applied to any hexagonal twisted moire' pattern and easily extended to other geometries.
PHYSICAL REVIEW LETTERS
(2023)
Article
Mathematics, Applied
R. Muratov, N. A. Kudryashov, P. N. Ryabov
Summary: In this study, numerical analysis was conducted to investigate the self-organization processes of adiabatic shear bands formation in depleted uranium, aluminum alloy, and high-strength steel. The influence of initial plastic strain rate and spatial dimension on the formation process was found to be significant. The method of shear bands selection and new statistical distributions for band spacing were also introduced, showing that the interaction between shear bands has a significant impact on the spacing between them.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2023)
Article
Physics, Applied
Ming Cheng, Yuxin Zhang, Lingyi Meng, Xiaohu Yao
Summary: Previous studies have contradictory conclusions on the influence of notches on metallic glasses. This study reveals that notches can strengthen metallic glasses and disturb their structural order.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Anatomy & Morphology
Taha Z. N. Sokkar, Mohammed A. El-Bakary, Amira A. S. Azam, Ahmed A. Hamza
Summary: This study focuses on the shear bands formed during the stretching of isotactic polypropylene fibers, using digital photoelasticity technique for visualization of stress and modifying mechanical testing devices for better measurements. The research investigates the impact of various parameters such as stretching rates and ambient temperature on shear band formation, as well as the influence of pre-existing shear bands under heating conditions.
MICROSCOPY RESEARCH AND TECHNIQUE
(2022)
Article
Chemistry, Physical
Rachel Davidson, Ankit Verma, David Santos, Feng Hao, Coleman Fincher, Sisi Xiang, Jonathan Van Buskirk, Kelvin Xie, Matt Pharr, Partha P. Mukherjee, Sarbajit Banerjee
ACS ENERGY LETTERS
(2019)
Article
Chemistry, Multidisciplinary
Shuang Qin, Sisi Xiang, Bailey Eberle, Kelvin Xie, Jaime C. Grunlan
ADVANCED MATERIALS INTERFACES
(2019)
Article
Multidisciplinary Sciences
Sisi Xiang, Luoning Ma, Bruce Yang, Yvonne Dieudonne, George M. Pharr, Jing Lu, Digvijay Yadav, Chawon Hwang, Jerry C. LaSalvia, Richard A. Haber, Kevin J. Hemker, Kelvin Y. Xie
Article
Materials Science, Ceramics
Sisi Xiang, Qirong Yang, Hsu-Ming Lien, Keya Shial, Eric Gronske, Richard Haber, Kelvin Y. Xie
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2020)
Article
Materials Science, Multidisciplinary
Sisi Xiang, Ian McCue, Digvijay Yadav, Yongqiang Wang, Jon Kevin Baldwin, Michael J. Demkowicz, Kelvin Y. Xie
PHILOSOPHICAL MAGAZINE LETTERS
(2020)
Article
Chemistry, Physical
Gianna M. Valentino, Jessica A. Krogstad, Timothy P. Weihs, Kevin J. Hemker
JOURNAL OF ALLOYS AND COMPOUNDS
(2020)
Article
Engineering, Electrical & Electronic
Gianna M. Valentino, Pralav P. Shetty, Jessica A. Krogstad, Kevin J. Hemker
JOURNAL OF MICROELECTROMECHANICAL SYSTEMS
(2020)
Article
Materials Science, Multidisciplinary
Ian McCue, Sisi Xiang, Kelvin Xie, Michael J. Demkowicz
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2020)
Article
Nanoscience & Nanotechnology
Gianna M. Valentino, Pralav P. Shetty, Ankur Chauhan, Jessica A. Krogstad, Timothy P. Weihs, Kevin J. Hemker
SCRIPTA MATERIALIA
(2020)
Article
Materials Science, Multidisciplinary
Debjoy D. Mallick, Suhas Eswarappa Prameela, Deniz Ozturk, Cyril L. Williams, Minju Kang, Gianna M. Valentino, Jeffrey T. Lloyd, Justin W. Wilkerson, Timothy P. Weihs, K. T. Ramesh
Summary: Magnesium alloys are attractive for protection applications due to their high specific strength and stiffness, but suffer from low ductility. This study focuses on improving magnesium systems through materials-based design, conducting spall experiments on pure magnesium and alloyed magnesium, with a particular emphasis on the effect of precipitates on spall strength in Mg-9Al alloy. The experiments reveal that while precipitates can increase quasi-static yield strength, they also lead to a significant decrease in spall strength.
MECHANICS OF MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Ian D. McCue, Gianna M. Valentino, Douglas B. Trigg, Andrew M. Lennon, Chuck E. Hebert, Drew P. Seker, Salahudin M. Nimer, James P. Mastandrea, Morgana M. Trexler, Steven M. Storck
Summary: The study successfully leveraged additive manufacturing to design and fabricate SMA components capable of precise self-guided shape change in large-scale structures. Optimization of minor alloy doping and laser processing parameters allows for locally tailored transformation temperatures, laying the groundwork for future SMA-enabled deployable structures in remote environments.
MATERIALS & DESIGN
(2021)
Article
Materials Science, Multidisciplinary
Digvijay Yadav, Peng Chen, Sisi Xiang, Yongqiang Wang, Jon Kevin Baldwin, Peter Evans, Nicholas Williams, Michael J. Demkowicz, Kelvin Y. Xie
Summary: We investigated the response of Cu-W nanocomposites prepared by physical vapor co-deposition to He implantation. Nuclear reaction analysis revealed that a significant portion of the implanted He escapes during the implantation process. Microstructural analysis of the nanocomposites suggested that the loss of He is likely due to its diffusion out of the material along phase and grain boundaries. Our findings suggest that solid-state interfaces, such as phase and grain boundaries, serve as shortcut diffusion pathways for He transport.
Article
Chemistry, Multidisciplinary
Qiang Li, Cheng Hu, Mengjie Li, Phuc Truong, Jinghao Li, Hao-Sheng Lin, Mandar T. Naik, Sisi Xiang, Brian E. Jackson, Winson Kuo, Wenhao Wu, Yunqiao Pu, Arthur J. Ragauskas, Joshua S. Yuan
Summary: Lignin has been extensively studied as a renewable precursor for carbon materials, but the mechanisms by which its structure affects the properties of carbon fibers are still not fully understood, including mechanical and electroconductive performances. Research has shown that the structural characteristics of lignin, such as the content of beta-O-4 linkages, are significantly correlated with the mechanical and electroconductive properties of carbon fibers, with higher linear beta-O-4 linkages promoting better fiber performance.
Article
Materials Science, Multidisciplinary
Y. Liu, K. Zweiacker, C. Liu, J. T. McKeown, J. M. K. Wiezorek
Summary: The evolution of rapid solidification microstructure and solidification interface velocity of hypereutectic Al-20at.%Cu alloy after laser melting has been studied experimentally. It was found that the formation of microstructure was dominated by eutectic, alpha-cell, and banded morphology grains, and the growth modes changed with increasing interface velocity.
Article
Materials Science, Multidisciplinary
Bharat Gwalani, Julian Escobar, Miao Song, Jonova Thomas, Joshua Silverstein, Andrew Chihpin Chuang, Dileep Singh, Michael P. Brady, Yukinori Yamamoto, Thomas R. Watkins, Arun Devaraj
Summary: Castable alumina forming austenitic alloys exhibit superior creep life and oxidation resistance at high temperatures. This study reveals the mechanism behind the enhanced creep performance of these alloys by suppressing primary carbide formation and offers a promising alloy design strategy for high-temperature applications.
Article
Materials Science, Multidisciplinary
Jian Song, Qi Zhang, Songsong Yao, Kunming Yang, Houyu Ma, Jiamiao Ni, Boan Zhong, Yue Liu, Jian Wang, Tongxiang Fan
Summary: Recent studies have shown that achieving an atomically flat surface for metals can greatly improve their oxidation resistance and enhance their electronic-optical applications. Researchers have explored the use of graphene as a covering layer to achieve atomically flat surfaces. They found that high-temperature deposited graphene on copper surfaces formed mono-atomic steps, while annealed copper and transferred graphene on copper interfaces formed multi-atomic steps.
Article
Materials Science, Multidisciplinary
Jennifer A. Glerum, Jon-Erik Mogonye, David C. Dunand
Summary: Elemental powders of Al, Ti, Sc, and Zr are blended and processed via laser powder-bed fusion to create binary and ternary alloys. The microstructural analysis and mechanical testing show that the addition of Ti results in the formation of primary precipitates, while the addition of Sc and Zr leads to the formation of fine grain bands. The Al-0.25Ti-0.25Zr alloy exhibits comparable strain rates to Al-0.5Zr at low stresses, but significantly higher strain rates at higher stresses during compressive creep testing. Finite element modeling suggests that the connectivity of coarse and fine grain regions is a critical factor affecting the creep resistance of the alloys.
Article
Materials Science, Multidisciplinary
P. Jannotti, B. C. Hornbuckle, J. T. Lloyd, N. Lorenzo, M. Aniska, T. L. Luckenbaugh, A. J. Roberts, A. Giri, K. A. Darling
Summary: This work characterizes the thermo-mechanical behavior of bulk nanocrystalline Cu-Ta alloys under extreme conditions. The experiments reveal that the alloys exhibit unique mechanical properties, behaving differently from conventional nanocrystalline Cu. They do not undergo grain coarsening during extrusion and exhibit behavior similar to coarse-grained Cu.
Article
Materials Science, Multidisciplinary
Yiqing Wei, Jingwei Li, Daliang Zhang, Bin Zhang, Zizhen Zhou, Guang Han, Guoyu Wang, Carmelo Prestipino, Pierric Lemoine, Emmanuel Guilmeau, Xu Lu, Xiaoyuan Zhou
Summary: This study proposes a new strategy to modify microstructure by phase regulation, which can simultaneously enhance carrier mobility and reduce lattice thermal conductivity. The addition of Cu in layered SnSe2 induces a phase transition that leads to increased grain size and reduced stacking fault density, resulting in improved carrier mobility and lower lattice thermal conductivity.
Article
Materials Science, Multidisciplinary
Jia Chen, Zhengyu Zhang, Eitan Hershkovitz, Jonathan Poplawsky, Raja Shekar Bhupal Dandu, Chang-Yu Hung, Wenbo Wang, Yi Yao, Lin Li, Hongliang Xin, Honggyu Kim, Wenjun Cai
Summary: In this study, the structural origin of the pH-dependent repassivation mechanisms in multi-principal element alloys (MPEA) was investigated using surface characterization and computational simulations. It was found that selective oxidation in acidic to neutral solutions leads to enhanced nickel enrichment on the surface, resulting in reduced repassivation capability and corrosion resistance.
Article
Materials Science, Multidisciplinary
X. Y. Xu, C. P. Huang, H. Y. Wang, Y. Z. Li, M. X. Huang
Summary: The limited slip systems of magnesium (Mg) and its alloys hinder their wide applications. By conducting tensile straining experiments, researchers discovered a rate-dependent transition in the dislocation mechanisms of Mg alloys. At high strain rates, glissile dislocations dominate, while easy-glide dislocations dominate at low strain rates. Abundant glissile dislocations do not necessarily improve ductility.
Article
Materials Science, Multidisciplinary
M. S. Szczerba, M. J. Szczerba
Summary: Inverse temperature dependences of the detwinning stress were observed in face-centered cubic deformation twins in Cu-8at.%Al alloy. The detwinning stress increased with temperature when the pi detwinning mode was involved, but decreased when the pi/3 mode was involved. The dual effect of temperature on the detwinning stress was due to the reduction of internal stresses pre-existing within the deformation twins. The complete reduction of internal stresses at about 530 degrees C led to the equivalence of the critical stresses of different detwinning modes and a decrease in the yield stress anisotropy of the twin/matrix structure.
Article
Materials Science, Multidisciplinary
Taowen Dong, Tingting Qin, Wei Zhang, Yaowen Zhang, Zhuoran Feng, Yuxiang Gao, Zhongyu Pan, Zixiang Xia, Yan Wang, Chunming Yang, Peng Wang, Weitao Zheng
Summary: The interaction between the electrode and the electric double layer (EDL) significantly influences the energy storage mechanism. By studying the popular alpha-Fe2O3 electrode and the EDL interaction, we find that the energy storage mechanism of the electrode can be controlled by modulating the EDL.
Article
Materials Science, Multidisciplinary
Matthew R. Barnett, Jun Wang, Sitarama R. Kada, Alban de Vaucorbeil, Andrew Stevenson, Marc Fivel, Peter A. Lynch
Summary: The elastic-plastic transition in magnesium alloy Mg-4.5Zn exhibits bursts of deformation, which are characterized by sudden changes in grain orientation. These bursts occur in a coordinated manner among nearby grains, with the highest burst rate observed at the onset of full plasticity. The most significant burst events are associated with twinning, supported by the observation of twinned structures using electron microscopy. The bursts are often preceded and followed by a stasis in peak movement, indicating a certain "birth size" for twins upon formation and subsequent growth at a later stage.
Article
Materials Science, Multidisciplinary
Vaidehi Menon, Sambit Das, Vikram Gavini, Liang Qi
Summary: Understanding solute segregation thermodynamics is crucial for investigating grain boundary properties. The spectral approach and thermodynamic integration methods can be used to predict solute segregation behavior at grain boundaries and compare with experimental observations, thus aiding in alloy design and performance control.
Article
Materials Science, Multidisciplinary
Feiyu Qin, Lei Hu, Yingcai Zhu, Yuki Sakai, Shogo Kawaguchi, Akihiko Machida, Tetsu Watanuki, Yue-Wen Fang, Jun Sun, Xiangdong Ding, Masaki Azuma
Summary: This study reports on the negative and zero thermal expansion properties of Cd2Re2O7 and Cd1.95Ni0.05Re2O7 materials, along with their ultra-low thermal conductivity. Through investigations of their structures and phonon calculations, the synergistic effect of local structure distortion and soft phonons is revealed as the key to achieving these distinctive properties.
Article
Materials Science, Multidisciplinary
Thomas Beerli, Christian C. Roth, Dirk Mohr
Summary: A novel testing system for miniature specimens is designed to characterize the plastic response of materials for which conventional full-size specimens cannot be extracted. The system has an automated operation process, which reduces the damage to specimens caused by manual handling and improves the stability of the test results. The experiments show that the miniature specimens extracted from stainless steel and aluminum have high reproducibility, and the results are consistent with those of conventional-sized specimens. A correction procedure is provided to consider the influence of surface roughness and heat-affected zone caused by wire EDM.
Article
Materials Science, Multidisciplinary
Rani Mary Joy, Paulius Pobedinskas, Nina Baule, Shengyuan Bai, Daen Jannis, Nicolas Gauquelin, Marie-Amandine Pinault-Thaury, Francois Jomard, Kamatchi Jothiramalingam Sankaran, Rozita Rouzbahani, Fernando Lloret, Derese Desta, Jan D'Haen, Johan Verbeeck, Michael Frank Becker, Ken Haenen
Summary: This study investigates the influence of film microstructure and composition on the Young's modulus and residual stress in nanocrystalline diamond thin films. The results provide insights into the mechanical properties and intrinsic stress sources of these films, and demonstrate the potential for producing high-quality nanocrystalline diamond films under certain conditions.