Article
Engineering, Mechanical
Huaping Ding, Pan Gong, Wen Chen, Zhen Peng, Hengtong Bu, Mao Zhang, Xuefeng Tang, Junsong Jin, Lei Deng, Guoqiang Xie, Xinyun Wang, Ke-fu Yao, Jan Schroers
Summary: Structural applications of metallic glasses are limited by their brittleness and strain-softening. However, this study shows that by applying electric currents, the structural fluctuations of metallic glasses can be enhanced, leading to improvements in strength, plasticity, and strain hardening capacity. This is achieved through the introduction of more soft zones surrounded by hard zones, which promotes the growth and interaction of shear bands. The mechanism behind the electric current-induced dynamic evolution of amorphous clusters is proposed to involve interatomic electrostatic forces and charge transfer.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Materials Science, Multidisciplinary
Harald Roesner, Christian Kuebel, Stefan Ostendorp, Gerhard Wilde
Summary: This study investigates the plastic deformation of metallic glasses through the formation of shear bands. It is found that the observed contrast of shear bands is related to thickness reduction rather than density changes, which may affect the interpretation of shear band properties. The observation of a spearhead-like shear front suggests a mechanism for shear band initiation.
Article
Chemistry, Physical
N. Z. Zhang, K. Sun, D. Sopu, F. Spieckermann, X. D. Ma, C. Geng, X. L. Bian, Y. D. Jia, Q. Wang, G. Wang, J. Eckert
Summary: The enhancement of plasticity in metallic glasses can be achieved by synthesizing composites with crystalline phases. In this study, the evolution of crystallization and the correlation between void-like defects and crystallization in cryogenically-treated metallic glasses were investigated. It was found that cryogenic treatment promotes crystallization and reduces the concentration of nanoscale defects. The findings have important implications for designing metallic glass composites with controlled length scales and distribution of crystalline inclusions.
Article
Materials Science, Multidisciplinary
Xiangcheng Cui, Weihua Hu, Xing Lu, Yunzhuo Lu
Summary: Introducing ductile crystalline dendrites into a glassy matrix is an effective way to improve the ductility of bulk metallic glasses. A lamellated Zr-based BMGC fabricated using flexible laser additive manufacturing shows exceptional strength-ductility synergy. This design motif provides a new window for the development of high-performance BMGCs and can be applied to enhance the strength and plasticity of other brittle metallic materials.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
He Ma, Dandan Qin, Chun Shang, Yunzhuo Lu
Summary: In this study, a layered metallic glass composite with high yield strength and compression ductility was successfully synthesized via laser additive manufacturing. The unique structure and asynchronous deformation of the material contribute to its remarkable mechanical properties, offering a new paradigm for designing engineered materials with excellent strength and ductility.
Article
Nanoscience & Nanotechnology
Shutao Song, Xu He, Qiang Zhou, Luyang Ren, Quanfang Chen, Yuanli Bai
Summary: A temperature-dependent strengthening analytical model is proposed for carbon nanotube reinforced metal matrix composites, considering three common strengthening mechanisms. The model can predict composite material strength and, when combined with a ductility analytical model, can analyze ductility loss. The models provide guidance for new material design and processing.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
W. H. Zhou, N. T. Panagiotopoulos, A. L. Greer, Y. Li
Summary: A rejuvenated Zr-based bulk metallic glass was tested in tension and exhibited strain-hardening behavior. The plastic strain at failure reached 0.9%, which is considered high for metallic glasses. Comparisons with other alloys showed that the hardening rate of the metallic glass decreases rapidly with increasing strain, limiting its tensile plastic strain to approximately 1%. Rejuvenation delayed early catastrophic failure and resulted in changes in the fracture surface morphology.
SCRIPTA MATERIALIA
(2022)
Article
Multidisciplinary Sciences
Qi Zhu, Qishan Huang, Yanzhong Tian, Shuchun Zhao, Yingbin Chen, Guang Cao, Kexing Song, Yanjun Zhou, Wei Yang, Ze Zhang, Xianghai An, Haofei Zhou, Jiangwei Wang
Summary: This study investigates the intrinsic deformability of defective twin boundaries in metallic materials and finds that inherent kinks on twin boundaries can facilitate the formation of secondary and hierarchical nanotwins. This defect-driven hierarchical twinning propensity is critically dependent on the kink height and is generally applicable in various metals and alloys.
Article
Materials Science, Ceramics
Mingyou Shi, Jinyan Chen, Chao Chen
Summary: The thickness of metallic glass thin films influences their fracture strength and failure mechanisms, with un-notched films transitioning from shear banding to homogeneous deformation as thickness decreases. In contrast, notched films consistently exhibit shear banding regardless of thickness, with a strengthening effect observed near the shear band thickness.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Materials Science, Multidisciplinary
Michael Burtscher, Markus Alfreider, Christina Kainz, Klemens Schmuck, Daniel Kiener
Summary: Grain refinement of W-Cu composites was achieved using high-pressure torsion, resulting in improved mechanical properties. Various characterization methods were applied to analyze the microstructures and identify the beneficial and unfavourable components affecting the fracture properties.
MATERIALS & DESIGN
(2022)
Article
Chemistry, Physical
V. Semin, J. Jiang, V. I. Polkin, M. Saito, Y. Ikuhara, D. V. Louzguine-Luzgin
Summary: This study investigates the crystallization behavior of Ti-Ni-Cu glassy alloys with the addition of transition metals Cr, Mn, and Fe, which alters the transformation temperature and heat effects. Crystallization in the Fe-bearing alloy initiates on the free surface, leading to strong <100> texture formation, while Mn and Cr-containing samples undergo crystallization within the entire volume.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Yimeng Zhao, Xuan Li, Xiaobin Liu, Jiazi Bi, Yang Wu, Ruijuan Xiao, Ran Li, Tao Zhang
Summary: The development of Co-Ta-B-Si bulk metallic glasses with high glass-transition temperature, large compressive plasticity, high strength, and high glass-forming ability was achieved by accurately tuning the metalloid element contents of Si and B in the parental alloy. The improvement in plastic deformation was attributed to the self-organization behaviors of high-density shear bands.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Zi-Meng Wang, Yun-Fei Jia, Kai -Shang Li, Yong Zhang, Jia-Dong Cai, Xian-Cheng Zhang, Hiroyuki Hirakata, Shan -Tung Tu
Summary: To overcome the trade-off between strength and ductility in metallic materials, a gradient lamellar structure was fabricated in pure Ni using an ultrasound-aided deep rolling technique. Micro-tensile tests and microscopic characterization were conducted to understand the mechanical properties and effects of the microstructure. The study found that samples with small lamellar thickness and large aspect ratio exhibited excellent strength and ductility.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Jiri Orava, Shanoob Balachandran, Xiaoliang Han, Olga Shuleshova, Ebrahim Nurouzi, Ivan Soldatov, Steffen Oswald, Olof Gutowski, Oleh Ivashko, Ann-Christin Dippel, Martin Zimmermann, Yurii P. Ivanov, A. Lindsay Greer, Dierk Raabe, Michael Herbig, Ivan Kaban
Summary: The study used a combination of high-energy X-ray diffraction, containerless solidification during electromagnetic levitation, and transmission electron microscopy to investigate the phase evolution in a prototype Cu-Zr-Al glass during flash-annealing. Most of the phases formed during flash-annealing were found to be transient states, with only the B2 CuZr phase exhibiting equilibrium composition. Al-rich precipitates with a diameter of less than 10nm were also observed.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Ruitao Qu, Cynthia A. Volkert, Zhefeng Zhang, Feng Liu
Summary: The plastic yielding behavior of a brittle Fe-based metallic glass can be activated by decreasing the sample size to the micrometer scale. The yield strength of the brittle metallic glass was found to be at least 33% higher than the fracture strength measured with bulk samples. These findings clarify the physical nature of the strength of brittle metallic glasses and suggest the potential for using high-strength brittle metallic glasses in small-sized devices.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Wang Chao, Lou Yuming, Wang Xu, Peng Yichao, Huang Yijun, Bao Ting, Li Jixue, R. Lakshmi Narayan
Summary: The oxidation and cracking at the grain boundary of wrought Nimonic 80 A alloy under high temperature and load conditions are studied. It is found that the grain boundary forms cracks and transforms into a hierarchical structure, with a nanoscale recrystallized nickel layer in the center and ambilateral NiCr2O4/NiCrO3 layers on both sides. The recrystallized nickel layer oxidizes, and its formation is influenced by the oxidation of Cr and externally applied stress.
Article
Metallurgy & Metallurgical Engineering
K. S. N. Satish Idury, R. Lakshmi Narayan
Summary: Additive manufacturing techniques have the potential to produce large-size bulk metallic glass components, but the presence of oxygen during fabrication can affect their glass forming ability and mechanical properties. This review explores the issue of oxygen pick-up in BMGs during AM fabrication and discusses its impact on crystal nuclei formation, glass forming ability, and mechanical properties.
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
(2023)
Article
Chemistry, Physical
Weihua Hu, Zejiang Yu, Yunzhuo Lu, Juntao Huo, Zuoxiang Qin, Xing Lu, R. Lakshmi Narayan
Summary: This study investigates the microstructures and mechanical properties of 50 wt% Nb-reinforced Zr-based bulk metallic glass composites (BMGCs) manufactured via laser directed energy deposition (LDED) with two different laser powers, and compares them with those of LDED manufactured monolithic bulk metallic glass (BMG). The results show that both BMGCs have a multi-component microstructure, while the monolithic BMG contains only one component. The nanocrystals at the melt-pool boundaries embrittle the monolithic BMG, resulting in higher yield strength but negligible plastic deformation. In contrast, both BMGCs exhibit significant plastic deformation due to the reinforcement of Nb, which improves plasticity and reduces the volume fraction of nanocrystallites at the melt-pool boundaries. The BMGC manufactured at higher laser power exhibits higher shear band plasticity, despite having higher volume fraction of nanocrystallites and lower enthalpy of relaxation. The load transfer characteristics of the Nb-BMG matrix interfaces in the two BMGCs are analyzed and rationalized.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Tingyi Yan, Long Zhang, R. Lakshmi Narayan, Jingyu Pang, Yi Wu, Huameng Fu, Hong Li, Upadrasta Ramamurty, Haifeng Zhang
Summary: This study investigates the influence of different microstructures and cryogenic cyclic treatment (CCT) on the impact toughness of bulk metallic glass composites (BMGCs). It is found that at 298 K, the intrinsic toughness of the glass matrix and deformation-induced martensitic transformation (DIMT) are the key mechanisms, while at 77 K, the toughness is primarily determined by the glass matrix itself. The addition of Al affects the phase stability and impact toughness of BMGCs at 298 K, but it causes embrittlement at 77 K. CCT can rejuvenate the BMGCs and enhance the impact toughness at 298 K, but it decreases the toughness at 77 K with increasing CCT cycles.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Metallurgy & Metallurgical Engineering
S. Pradeep Kumar, V Chakkravarthy, A. Mahalingam, R. Rajeshshyam, N. Sriraman, P. Marimuthu, R. Lakshmi Narayan, P. Dinesh Babu
Summary: The main limitation of selective laser melting (SLM)-based additive manufacturing is the smaller build size and the lack of standard rework techniques. This study explores the weldability of SLM-built stainless steel samples and evaluates the quality of the weld. The results show that laser-welded SLM samples exhibit superior tensile strength and hardness, providing a novel solution for reworking defective SLM components.
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
(2023)
Article
Nanoscience & Nanotechnology
Yaojie Wen, Jianbao Gao, Ramasubramanian Lakshmi Narayan, Pei Wang, Lijun Zhang, Baicheng Zhang, Upadrasta Ramamurty, Xuanhui Qu
Summary: The microstructures and mechanical properties of a laser powder bed fusion manufactured compositionally graded alloy of SS316L and Inconel 718 were studied. Heat treatment caused changes in the microstructure and mechanical properties of the alloy, including coarsening of Laves phases and precipitation of gamma and gamma' phases. The alloy exhibited increased hardness, yield strength, and tensile strength but decreased ductility after heat treatment.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Multidisciplinary Sciences
Yuhao Qiang, Abdoulaye Sissoko, Zixiang L. Liu, Ting Dong, Fuyin Zheng, Fang Kong, John M. Higgins, George E. Karniadakis, Pierre A. Buffet, Subra Suresh, Ming Dao
Summary: This article introduces the clearance of altered red blood cells by the spleen and the mechanisms underlying these processes. By studying sickle cell disease, it is found that the retention and adhesion of red blood cells are faster in blood samples from patients with sickle cell disease compared to healthy individuals. Additionally, under hypoxic conditions, the phagocytosis process of sickled red blood cells is different from non-sickled red blood cells. It is also observed that reoxygenation significantly alleviates RBC retention and leads to rapid unsickling of ingested sickled red blood cells. These findings provide insights into the maintenance of homeostatic balance in the spleen and the potential clinical manifestations in hematologic diseases.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Chemistry, Multidisciplinary
Shou-Yi Chang, Yi-Chung Huang, Shao-Yi Lin, Chia-Ling Lu, Chih Chen, Ming Dao
Summary: The nanoscopic deformation of < 111 > nanotwinned copper nanopillars under different strain rates was investigated using in situ transmission electron microscopy. The study found that the deformation mechanism, including dislocation activity and twin boundary migration, is influenced by strain rates. At higher strain rates, dislocations accumulate in the nanotwinned copper, resulting in significant hardening. At lower strain rates, detwinning occurs and the hardening is reduced. Different deformation mechanisms, such as dislocation activity and twin boundary migration via atom motion, are proposed based on the experimental results.
Article
Engineering, Mechanical
Weicheng Huang, Mingchao Liu, K. Jimmy Hsia
Summary: A numerical framework based on discrete differential geometry (DDG) is used to analyze the dynamics of bio-inspired cilia carpet robots powered by an external magnetic field. The model accurately captures the behavior of the active cilia and the carpet, and provides insights for the optimal design of cilia-inspired soft robots for biomedical applications. The framework is computationally efficient and can simulate dynamic locomotion such as crawling and rolling. (c) 2023 Elsevier Ltd. All rights reserved.
EXTREME MECHANICS LETTERS
(2023)
Article
Biophysics
Guansheng Li, Yuhao Qiang, He Li, Xuejin Li, Ming Dao, George Em Karniadakis
Summary: Erythrophagocytosis is a critical process in the spleen for removing senescent and diseased red blood cells from circulation. However, the biophysical interaction between red blood cells and macrophages in pathological conditions like sickle cell disease has not been well studied. This study combines computational simulations and microfluidic experiments to investigate the adhesion dynamics between red blood cells and macrophages under flow conditions similar to those in the spleen.
BIOPHYSICAL JOURNAL
(2023)
Article
Multidisciplinary Sciences
Mario Carucci, Julien Duez, Joel Tarning, Irene Garcia-Barbazan, Aurelie Fricot-Monsinjon, Abdoulaye Sissoko, Lucie Dumas, Pablo Gamallo, Babette Beher, Pascal Amireault, Michael Dussiot, Ming Dao, Mitchell V. Hull, Case W. McNamara, Camille Roussel, Papa Alioune Ndour, Laura Maria Sanz, Francisco Javier Gamo, Pierre Buffet
Summary: Malaria parasites multiply in red blood cells, but can be eliminated when the cells become stiff. Through screening, two safe drugs were found that can block the transmission of malaria.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Qiaodong Wei, Xiaolong Wang, Ce Zhang, Ming Dao, Xiaobo Gong
Summary: In this study, we investigated the morphological changes and mechanical behavior of red blood cells (RBCs) during aging using an in vitro mechanical fatigue model. We identified three typical shape transformations of RBCs during mechanical fatigue, which are strongly associated with the loss of surface area. Mathematical models were constructed to describe the evolution of surface area and membrane shear modulus, and an ensemble parameter was developed to quantitatively evaluate the aging status of RBCs. This study provides a novel in vitro fatigue model for studying the mechanical behavior of RBCs and a quantitative index for differentiating individual RBCs based on their age and physical properties.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Multidisciplinary
Ting Yang, T. A. Venkatesh, Ming Dao
Summary: In this study, the mechanical responses of materials with graded nanostructured surfaces during fretting sliding are compared to homogeneous materials. The results show that metallic materials with a graded nanostructured surface exhibit superior fretting damage resistance by reducing the plastically deformed surface areas and volumes by more than 80%. By decreasing the friction coefficient, optimal fretting resistance can be achieved in the graded nanostructured material.
Article
Engineering, Mechanical
Weicheng Huang, Mingchao Liu, K. Jimmy Hsia
Summary: Hard-magnetic soft materials and structures have attracted wide attention in various engineering applications due to their rapid configurational transformation under non-contact magnetic stimuli. Predicting their mechanical responses is crucial for realizing their full potentials. In this work, we propose a discrete magneto-elastic rod model to analyze the mechanical behaviors of slender structures made of HMS materials. The model considers the dipole-dipole interaction and viscous effect and significantly improves the computational efficiency for simulating the mechanical, especially dynamic, behaviors of hard-magnetic slender structures.
EXTREME MECHANICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Priyanka Saini, Shankha Nag, Jae-il Jang, In-Chul Choi, Upadrasta Ramamurty, R. L. Narayan
Summary: Statistical analysis is often conducted to understand the micromechanisms of plasticity by analyzing the shear stresses at which the first 'pop-ins' occur during nano-indentation. This study focuses on the second 'pop-in' stress and finds that the 3-parameter Weibull distribution is the best descriptor for its stochasticity. The study also provides insight into the development of plasticity in bulk metallic glasses during nano-indentation.
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.
