Article
Materials Science, Multidisciplinary
Kelvin Wong, Nicholas Armstrong
Summary: The complexity of collective dislocation behavior has led to the use of mesoscopic models, but there is no generally accepted method for transforming a deterministic model into a stochastic one. This study proposes a physically motivated method for deriving stochastic models that preserve the non-negativity of the dislocation density and ensure the desired physical bounds.
Article
Chemistry, Physical
Jian Liu, Yali He, Yaowu Hu
Summary: As metal forming processes continue to develop, understanding the nano-deformation behavior of metals is crucial for optimizing manufacturing processes and controlling the properties of nano-materials. Unfortunately, the effect of temperature on the deformation behavior of nano-metals under high strain rates remains largely unexplored. This study demonstrates the nonlinear effect of temperature on the formability of nano-metals.
NANOSCALE HORIZONS
(2023)
Article
Chemistry, Physical
Runrun Xu, Miaoquan Li
Summary: This study used EBSD and TEM technologies to investigate the deformability of Ti-42.9Al-4.6Nb-2Cr alloy and the coordination deformation mechanism between the beta phase and gamma phase, revealing that all Schmid factors for slip systems in the beta phase were larger than 0.25, mainly achieved through the fast CDRX rate of the beta phase.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Chaitanya Joshi, Mathew Q. Giso, Jean-Francois Louf, Sujit S. Datta, Timothy J. Atherton
Summary: In this study, we approach the problem of hydrogel swelling under physical constraints as an energy optimization problem. By applying our method, we were able to compute the equilibrium shapes of hydrogel spheres confined within a jammed matrix of rigid beads, and interpret the results to understand how confinement affects the mechanics of swollen hydrogels. We found that confinement leads to spatial separation of strains within the bulk of the hydrogel and a transition from Hertzian to non-Hertzian behavior in contact mechanics as swelling occurs.
Article
Chemistry, Physical
Chaitanya Joshi, Mathew Q. Giso, Jean-Francois Louf, Sujit S. Datta, Timothy J. Atherton
Summary: This study presents an energy optimization approach to solve the problem of hydrogel swelling under physical constraints. The equilibrium shapes of hydrogel spheres confined within a jammed matrix of rigid beads are computed using this method, and the results provide insights into how confinement modifies the mechanics of swollen hydrogels.
Article
Materials Science, Multidisciplinary
Anibal Faruk Abedrabbo, Juan Camilo Osorio, Sepideh Abolghasem, Carlos Valencia, Fabio Rojas
Summary: In this study, microstructure transformations during severe shear deformation induced by large strain machining experiments are examined. Through parameterization and prediction methods, opportunities for creating multifunctional surface microstructure in various machining manufacturing processes are identified.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Yipeng Li, Yifan Ding, Cheng-en Li, Jiacheng Ren, Guang Ran
Summary: In this study, the effect of dislocation structures generated by pre-strain in submicron-sized copper on subsequent plastic deformation was investigated using in-situ nanocompression testing in a transmission electron microscope. The results revealed that the dislocations first undergo directional intermittent jumping motion along specific glide directions, and their jumping frequency and distance can be determined by the density and strength of obstacles in the crystal. The dislocation wall formed during pre-strain effectively pins the mobile dislocation in the early stages of compression, but at high stress levels, it leads to dislocation avalanches and strain burst emissions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Ryan B. Sills, Michael E. Foster, Xiaowang Zhou
Summary: The character angle dependence of dislocation-solute interactions in a random Fe0.70Ni0.11Cr0.19 alloy was explored through molecular dynamics simulations, showing that the activation area in this alloy is governed by dislocation line tension rather than the dislocation-solute interaction itself. This finding motivates further research into the line geometry of dislocations in solid solutions.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Xinrui Min, Biao Yan, Xihang Zhao, Xiaowen Fu, Zhenming Yue, Zhanqiu Tan, Zhiqiang Li
Summary: Carbon nanotube (CNT)-reinforced aluminum alloys (Al) are considered as ideal metal-matrix composites with high strength and elastic moduli, but low ductility. This research conducted simulations under uniaxial tension and shear loading paths to investigate the mechanical properties of CNT/Al6061 composite. Multiple mechanism-based strain gradient models (MMSG) were proposed to analyze the correlation between microstructure evolution and macro mechanical responses.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Xinrui Min, Biao Yan, Xihang Zhao, Xiaowen Fu, Zhenming Yue, Zhanqiu Tan, Zhiqiang Li
Summary: Carbon nanotube (CNT)-reinforced aluminum alloys (Al) are considered ideal metal-matrix composites due to their high strength and elastic moduli. However, they have low ductility. In this study, simulations were conducted to investigate the mechanical properties of CNT/Al6061 composite, and a novel multiple mechanism-based strain gradient model (MMSG) was proposed. The interfacial bonding, grain size, and dislocation density were considered in the simulation. The results can reveal the synergetic strength and ductility of the microstructure, as well as the strain partition and failure of different phases in CNT/Al6061 composites.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Ehsan Norouzi, Reza Miresmaeili, Hamid Reza Shahverdi, Mohsen Askari-Paykani, Laura Maria Vergani
Summary: The study investigated the effect of plastic deformations on the hydrogen embrittlement of TRIP steel. In situ tensile tests revealed that the total elongation loss increased by 36.8% with increasing hydrogen current density. EBSD observation showed that hydrogen charging decreased stacking fault energy, leading to the formation of more a0-martensite. The formation of a0-martensite and increased dislocation density resulted in the reversible trap sites.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Prakhar Bandil, Franck J. Vernerey
Summary: Mechanical forces play a crucial role in the morphogenesis and growth of biological tissues, and understanding the interaction between mechanical forces and biological processes is of great importance. This study presents a continuum-scale model that describes the active mechanics and evolution of a cell population, which can capture the complex cross-talk between mechanical forces and biological processes.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Nanoscience & Nanotechnology
F. J. Dominguez-Gutierrez, S. Papanikolaou, A. Esfandiarpour, P. Sobkowicz, M. Alava
Summary: The study investigates the effects of high temperature on the mechanical deformation properties of single crystalline Mo under nanoindentation, revealing that temperature increase changes dislocation densities, mechanisms, atomic displacements, and hardness. The characteristic formation of [001] dislocation junctions and high-temperature stability may be responsible for the persistent thermomechanical stability of Mo, contrasting with other BCC metals.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Huan Zhang, Yangxin Li, Yuxuan Liu, Qingchun Zhu, Xixi Qi, Gaoming Zhu, Jinhui Wang, Peipeng Jin, Xiaoqin Zeng
Summary: This study investigates the features and evolution mechanism of {11 (2) over bar1} twin boundaries in a high strain rate compressed Mg-10Gd-3Y-0.4Zr alloy using Schmid factor calculations, EBSD, and TEM analysis. The interaction between basal < a > dislocations and twins during deformation can lead to misorientation deviation and the formation of steps at the twin boundary, providing a new understanding of twinning behavior in Mg alloys.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
S. Lay
Summary: Geometrical calculations were used to evaluate the resistance of WC grain boundaries in WC-Co cemented carbides to transfer plastic deformation. It was found that E = 2 and E = 4 grain boundaries are more resistant to dislocation propagation compared to other grain boundaries, which could be controlled to tune the material properties.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Hossein Eskandari Sabzi, Pedro E. J. Rivera-Diaz-del-Castillo
MATERIALS & DESIGN
(2020)
Article
Engineering, Manufacturing
Hossein Eskandari Sabzi, Suhyun Maeng, Xingzhong Liang, Marco Simonelli, Nesma T. Aboulkhair, Pedro E. J. Rivera-Diaz-del-Castillo
ADDITIVE MANUFACTURING
(2020)
Article
Materials Science, Multidisciplinary
Andrej Turk, Shengda D. Pu, David Bombac, Pedro E. J. Rivera-Diaz-del-Castillo, Enrique Galindo-Nava
Article
Nanoscience & Nanotechnology
G-H Zhao, X. Z. Liang, X. Xu, M. B. Gamza, H. Mao, D. Louzguine-Luzgin, P. E. J. Rivera-Diaz-del-Castillo
Summary: By developing new alloys and adjusting alloy compositions, researchers successfully optimized the mechanical characteristics of metallic alloys and achieved enhanced plasticity.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Madeleine Bignon, Emmanuel Bertrand, Pedro E. J. Rivera-Diaz-del-Castillo, Franck Tancret
Summary: The study proposes an explanation for the inhibition of martensite beyond characteristic concentration thresholds in titanium binary alloys, combining the phenomenological theory of martensite crystallography and thermodynamic calculations. It shows that martensite formation can be prevented crystallographically while still being thermodynamically favorable. By considering the influence of composition, two twinning systems and two glide systems are identified to produce the lattice invariant shear, with computed critical concentrations for martensite formation aligning well with experimental results. The method may serve as a guide for designing titanium alloys with controlled martensitic behavior.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Qing Tao, Jian Wang, E. Galindo-Nava
Summary: This study investigated the effect of low-temperature tempering on confined precipitation and mechanical properties of a high-alloy carburising steel in surface layers. After tempering for 1.5 hours, the strength and ductility of the surface layers reach a maximum value, with the elongation of high carbon content surface layers comparable to that of the low carbon content core.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Chunguang Shen, Chenchong Wang, Pedro E. J. Rivera-Diaz-del-Castillo, Dake Xu, Qian Zhang, Chi Zhang, Wei Xu
Summary: Physical metallurgical (PM) and data-driven approaches can be independently applied to alloy design. PM approaches provide a clearer picture of the overall composition-microstructure-properties relationship but are highly sensitive to the alloy system and lack exploration ability of new domains. On the other hand, machine learning (ML) offers stronger prediction accuracy but provides little explicit physical insight. Hybrid PM/ML approaches maximize accuracy while leading to a clearer physical picture and desired properties.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Guohua Zhao, Xin Xu, David Dye, Pedro E. J. Rivera-Diaz-del-Castillo, Nik Petrinic
Summary: This study reported a method to deploy transformation-mediated strengthening in titanium alloys by supervised activation of TRIP and TWIP through mechanism-driven modelling, improving the mechanical properties of materials. By developing new alloys, notable resistance to strain localization was achieved, along with significant strain-hardening effects.
SCRIPTA MATERIALIA
(2022)
Article
Nanoscience & Nanotechnology
Hossein Eskandari Sabzi, Xiao-Hui Li, Chi Zhang, Hanwei Fu, David San-Martin, Pedro E. J. Rivera-Diaz-del-Castillo
Summary: Nanotwin formation in austenitic stainless steels during laser powder bed fusion (LPBF) was observed, with the nature of such twins revealed using transmission electron microscopy. Dynamic recrystallization (DRX) was activated and induced by deformation nanotwins in LPBF. A thermostatistical model was proposed, validated, and offers a method for microstructurally engineering austenitic stainless steels for applications requiring high strength and ductility.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Hossein Eskandari Sabzi, Everth Hernandez-Nava, Xiao-Hui Li, Hanwei Fu, David San-Martin, Pedro E. J. Rivera-Diaz-del-Castillo
Summary: A new approach to modeling microstructure evolution and yield strength in laser powder bed fusion components was introduced, revealing the activation of various restoration mechanisms during the process. A mechanism for the formation of low-angle grain boundaries to enhance alloy strength was suggested, along with a validated equation based on subgrain size. The study quantitatively described the dependency of yield stress on process parameters and alloy composition.
MATERIALS & DESIGN
(2021)
Article
Materials Science, Multidisciplinary
Fernando D. Leon-Cazares, Enrique Galindo-Nava
Summary: This study derived numerical solutions to solute diffusion equations at solid-solid interfaces, considering discrete variations in the energy landscape, and developed a variety of model interfaces to track solute segregation behavior and diffusion effects. This research represents a significant advancement in the mathematical treatment of solute diffusion through solid-solid interfaces and serves as an important bridge between atomistic and macroscopic diffusion modeling.
PHYSICAL REVIEW MATERIALS
(2021)
Article
Engineering, Mechanical
X. Z. Liang, P. E. J. Rivera-Diaz-del-Castillo
Summary: This study investigates the influence of hydrogen on microstructural alterations in components subjected to rolling contact fatigue (RCF). A dislocation-assisted carbon migration model is developed to describe the formation of hydrogen-influenced microstructural alterations. The experimental results confirm the effectiveness of the model.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
Jianwei Zhao, Quan Yang, Hossein Eskandari Sabzi, Wei Wen, Pedro E. J. Rivera-Diaz-del-Castillo
Summary: Stress relaxation after hot deformation is modeled by considering various physical phenomena, including dislocation recovery, recrystallization, and precipitation. The model incorporates new formulations, such as a vacancy-mediated dislocation climb approach for dislocation recovery. The softening behavior of 6 microalloyed steel grades is tracked and compared with experimental data. The approach is also discussed for its application in additive manufacturing microstructural relaxation.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Nanoscience & Nanotechnology
Hossein Eskandari Sabzi, Xiao-Hui Li, Chi Zhang, Hanwei Fu, Pedro E. J. Rivera-Diaz-del-Castillo
Summary: A modelling approach is used to study the deformation mechanisms of 316L stainless steel produced by laser powder bed fusion (LPBF). The study reveals intrinsic differences in deformation behavior between LPBF builds and wrought alloys, which are thought to be caused by the presence of residual stress promoting dislocation recovery.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Multidisciplinary Sciences
P. Gong, J. Nutter, P. E. J. Rivera-Diaz-Del-Castillo, W. M. Rainforth
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.