Article
Multidisciplinary Sciences
Wangshu Zheng, Yan Shi, Lei Zhao, Shuangyue Jia, Linghai Li, Chee Lip Gan, Di Zhang, Qiang Guo
Summary: Small-scale shape memory ceramics integrated into a matrix material, such as cerium-doped zirconia reinforced aluminum composites, exhibit reversible phase transformations without causing destructive impact due to strong geometric confinement, robust interface, and particle network/force-chain configuration.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Shilei Liu, Kaiguang Luo, Hao Gu, Haitao Gao, Charlie Kong, Hailiang Yu
Summary: A processing route involving cryorolling and annealing was used to achieve heterogeneous grain structures in a Cr15Fe55Mn20Ni10 ferrous medium-entropy alloy. Through phase reversion and partial recrystallization, cryorolled sheets exhibited a heterogeneous microstructure with multi-scale grains, resulting in higher yield strength and fracture elongation compared to room-temperature rolled sheets. The improved mechanical properties were attributed to grain boundary hardening, hetero-deformation-induced hardening, and dislocation hardening.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Devashish Rajpoot, R. Lakshmi Narayan, Long Zhang, Punit Kumar, Haifeng Zhang, Parag Tandaiya, Upadrasta Ramamurty
Summary: Fracture behavior of bulk metallic glass matrix composites with both transforming and non-transforming fi-Ti dendrites under shear and opening modes was examined, showing lower fracture toughness in mode II due to shear dominant stress state and considerable crack growth in this mode. Despite the ability of transforming dendrites to strain harden and enhance ductility, BMGCs reinforced with non-transforming dendrites exhibit higher toughness in both modes. Shear band patterns suggest identical fracture mechanism in BMGCs and BMGs, with differences rationalized by the effect of relaxation enthalpy and dendrites length scale.
Article
Metallurgy & Metallurgical Engineering
Jeong-Chan Lee, Yeonju Noh, Nam-Su Kim, Ki Beom Park, Hyunghoon Kim, Hyung-Hwan Cho, Hyung-Ki Park, Tea-Sung Jun, Chang-Soo Park
Summary: This study compares the mechanical properties and microstructural features of 304 austenitic stainless steel, focusing on the effect of initial texture and deformation temperature. The results show that the mechanical features and strain-induced martensitic transformation rate depend on the tensile directions. In addition, a decrease in temperature significantly increases the dislocation densities and the formation of abundant twins and transformed martensites.
STEEL RESEARCH INTERNATIONAL
(2023)
Article
Chemistry, Physical
Yu Liu, Wen-Xuan Wang, Zhen-Yi Jiang, Zhi-Yong Zhang
Summary: The martensitic-like transformation from rutile to alpha-PbO2 phase as well as its inverse transformation induced by shear strain were studied for titanium dioxide. The transition from bulk alpha-PbO2 phase to the rutile phase can easily occur at 550 degrees C with a potential barrier of 325 meV/TiO2 in the absence of shear stress. However, under certain shear stress, the rutile twins cannot appear separately during the phase transition from the alpha-PbO2 phase to the rutile phase.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Xinna Liu, Shuai Zhang, Yanmei Bao, Zhongran Zhang, Zhenming Yue
Summary: The fatigue behavior of 316L stainless steel was studied under cyclic shear path with different strain amplitudes. It was found that the material exhibited cyclic hardening, saturation, and cyclic softening, and the fatigue life was negatively correlated with the strain amplitude. Microstructural analysis showed that grain refinement and martensitic transformation reduced the fatigue life of 316L.
Article
Materials Science, Multidisciplinary
Tianbing He, Tiwen Lu, Daniel Sopu, Xiaoliang Han, Haizhou Lu, Kornelius Nielsch, Jurgen Eckert, Nevaf Ciftci, Volker Uhlenwinkel, Konrad Kosiba, Sergio Scudino
Summary: This study explores the effectiveness of powder metallurgy as an alternative method for synthesizing shape memory bulk metallic glass composites. Shape memory bulk metallic glass composites with tunable microstructures and properties are obtained by hot pressing. The results demonstrate the expanded range of shape memory bulk metallic glass composites by freely choosing the combination of glassy matrix and shape memory phase.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Qingquan Lai, Huiqin Yang, Yuntao Wei, Hao Zhou, Lirong Xiao, Huiqiang Ying, Si Lan, Zesheng You, Zongde Kou, Tao Feng, Qi Lu, Pascal Jacques, Thomas Pardoen
Summary: The mechanisms contributing to the excellent mechanical properties of the ultrafine-grained Fe-23 wt.%Mn alloy processed by heavy ausforming are revealed. The alloy exhibits high ductility and resistance to cracking, contrary to the behavior of typical ultrafine-grained alloys. This is attributed to the gradual deformation-induced epsilon-martensitic transformation and to the large plastic co-deformation of the UFG epsilon-martensite.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Nanoscience & Nanotechnology
E. Povolyaeva, S. Mironov, D. Shaysultanov, N. Stepanov, S. Zherebtsov
Summary: A new medium-entropy Fe-65(CoNi)(25)Cr9.5C0.5 alloy was investigated for its properties at room and liquid nitrogen temperatures. The alloy exhibited high strength, good ductility, and excellent fracture toughness at cryogenic temperatures. The microstructure analysis suggested a phase transition induced by deformation, and the cold-rolled alloy showed improved mechanical properties compared to the as-cast alloy. Substructure strengthening, interphase strengthening, and solid solution strengthening were identified as contributing factors to the alloy's enhanced performance.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Polymer Science
Weiqin Tang, Dayong Li, Yinghong Peng, Peidong Wu
Summary: The study investigates the mechanism of shear band formation and evolution in amorphous glassy polymers, and finds that the initiation and propagation of shear bands are caused by intrinsic strain softening. Shear bands form and propagate during forward shearing, but gradually disappear during reverse shearing. Furthermore, shear bands cannot be recovered through reverse straining during plastic deformation.
Article
Engineering, Mechanical
A. R. Vishnu, M. Marvi-Mashhadi, J. C. Nieto-Fuentes, J. A. Rodriguez-Martinez
Summary: This paper presents new insights into the role of porous microstructure on dynamic shear localization. Finite element calculations of electromagnetically collapsing thick-walled cylinders were performed, and the numerical simulations showed that voids promote dynamic shear localization and affect the nucleation and development of shear bands.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Materials Science, Multidisciplinary
Rafal Schmidt, Blazej Skoczen, Jan Bielski, Elwira Schmidt
Summary: In ductile materials strained near absolute zero, the formation of adiabatic shear bands is closely related to the intermittent plastic flow, which is a result of nonlinear hardening due to phase transformation. A new double surface model has been developed to study and explain the mechanisms and propagation of shear bands.
MECHANICS OF MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Anne Tanguy, Peifang Chen, Thibaut Chaise, Daniel Nelias
Summary: This study investigates the case of frictionless contact between a spherical body and a flat metallic glass using mesoscopic plasticity description and semi-analytical elastic deformation description. It is found that plastic deformation initiates below the surface and the spatial organization of plastic rearrangements is non-universal, dependent on the choice of disorder and external loading conditions. Additionally, spatial curved shear bands may appear below the contact for specific parameter sets.
Article
Nanoscience & Nanotechnology
Sudeep K. Sahoo, Satyaveer Singh Dhinwal, Viet Q. Vu, Laszlo S. Toth
Summary: A new phenomenological strain hardening function has been proposed based on a simplification of crystal plasticity methods, utilizing only four parameters to describe the strain hardening behavior of metallic materials. Experimental results show that the method can effectively simulate the strain hardening behavior of different materials and can be used for crystal plasticity-based incremental strain hardening simulations in polycrystal viscoplastic modeling.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Biao Li, Long Zhang, Tingyi Yan, Huameng Fu, Hongwei Zhang, Hong Li, Haifeng Zhang
Summary: This study investigated the microstructures, compressive and tensile properties of (Ti0.615Zr0.385)100-3.9x(Cu2.3Fe1.6)x alloys. Martensitic amorphization was found in the as-cast Ti59.1Zr37Cu2.3Fe1.6 alloy. The deformation-induced martensitic transformation of beta ->alpha '' was fully suppressed with increasing x due to the increased phase stability. The Ti59.1Zr37Cu2.3Fe1.6 alloy with amorphous martensite exhibited the highest yield strength during compression, but exhibited catastrophic failure without plasticity upon tension.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Anup Basak, Valery Levitas
Article
Materials Science, Multidisciplinary
Anup Basak, Valery Levitas
MATHEMATICS AND MECHANICS OF SOLIDS
(2020)
Article
Physics, Multidisciplinary
Hamed Babaei, Valery I. Levitas
PHYSICAL REVIEW LETTERS
(2020)
Article
Chemistry, Physical
Hao Chen, Nikolai A. Zarkevich, Valery I. Levitas, Duane D. Johnson, Xiancheng Zhang
NPJ COMPUTATIONAL MATERIALS
(2020)
Article
Materials Science, Multidisciplinary
K. K. Pandey, Valery I. Levitas
Article
Materials Science, Multidisciplinary
Hao Chen, Valery Levitas, Liming Xiong, Xiancheng Zhang
Summary: The stationary motion of shuffle screw and 60 degrees dislocations in silicon under applied shear below the static Peierls stress has been proven through molecular dynamics simulations and continuum-level equation of motion. The concept of a dynamic Peierls stress below which stationary dislocation motion is impossible is established. The results suggest the potential for dynamic intensification of plastic flow and defects accumulations below the static Peierls stress.
Article
Physics, Applied
K. K. Pandey, Valery I. Levitas
Summary: A novel method using digital image correlation and ruby fluorescence microscopy has been developed to measure displacement fields in traditional diamond anvil cells and rotational DACs, providing crucial data for material property research.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Hamed Attariani, I. Valery Levitas
Summary: Oxidation is still a significant challenge in various industrial applications due to its coupled multi-physics nature. A general large-strain mechanochemical theory was developed to model anisotropic reaction/compositional strain, introducing a kinetic relationship between deviatoric reaction deformation rate and stress. The new model showed that deviatoric stress alters the chemical equilibrium constant and reaction rate through reaction-induced deviatoric stress.
Article
Multidisciplinary Sciences
Hao Chen, Valery Levitas, Dmitry Popov, Nenad Velisavljevic
Summary: The unexpected nanostructure evolution during Si-I -> Si-II phase transformation is revealed by combining molecular dynamics, crystallographic theory, and in situ real-time Laue X-ray diffraction. This phase transformation results in twinned Si-II and unexpected nanobands, which form specific interfaces with Si-I and create self-accommodated nanostructure.
NATURE COMMUNICATIONS
(2022)
Editorial Material
Thermodynamics
Francesco Dell'Isola, Valery I. Levitas, Valery P. Matveenko
CONTINUUM MECHANICS AND THERMODYNAMICS
(2023)
Article
Multidisciplinary Sciences
Valery Levitas
Summary: This study presents a developed theory that explains the puzzles of deep-focus earthquakes, including the coupled deformation, plastic strain-induced phase transformation, transformation-induced plasticity, and self-blown-up deformation-transformation-heating process in shear bands. By considering the transformation in olivine as plastic strain-induced and finding an analytical solution for the coupled deformation-transformation-heating process in shear bands, the study provides insights into the mechanisms behind the jump in strain rates and sudden transformation of metastable olivine. The study also highlights the importance of the thermomechanochemical feedback in the severe transformation-induced plasticity and self-blown-up deformation-transformation-heating process.
NATURE COMMUNICATIONS
(2022)
Article
Thermodynamics
Anup Basak, Valery I. Levitas
Summary: This paper revisits the nanoscale multiphase phase-field model for stress and temperature-induced multivariant martensitic transformation under large strains developed by the authors. It resolves the issues related to the gradient energy and coupled kinetic equations and develops a thermodynamically consistent model. The model considers N + 1 order parameters to describe austenite and N martensitic variants, taking into account the energies of the interfaces and a kinetic relationship for the rate of the order parameters. A large strain-based finite element method is used to simulate a 3D complex twins within twins microstructure, and a comparative study is presented.
CONTINUUM MECHANICS AND THERMODYNAMICS
(2023)
Article
Multidisciplinary Sciences
Valery I. Levitas, Achyut Dhar, K. K. Pandey
Summary: This study investigates the effects of stress and plastic strain tensors on various phenomena under high pressures in diamond-anvil cells. The authors suggest a coupled experimental-analytical-computational approach to measure these tensors and friction rules in the material using synchrotron X-ray diffraction. The results are in good agreement with experiments and open opportunities for quantitative high-pressure/stress science.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Valery Levitas
Summary: This paper introduces a general nonlinear theory for the elasticity of prestressed single crystals, defining various elastic moduli and their relationships. It also outlines possible applications to complex nonlinear elasticity problems and illustrates them for a superdislocation. The importance of B moduli in computational algorithms and the analysis of finite rotations are highlighted.
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.