Article
Chemistry, Physical
Stefan Michalik, Pal Jovari, Karel Saksl, Martin Durisin, Dusan Balga, Jacques Darpentigny, Michael Drakopoulos
Summary: Detailed information on the atomic arrangement of glassy Cu54Hf46, Cu61Hf39 and Cu69Hf31 alloys has been obtained through reverse Monte Carlo simulation using high-energy X-ray diffraction and neutron diffraction data. Cu-centered clusters exhibit stronger ordering compared to Hf-centered clusters, and Cu54Hf46 and Cu61Hf39 have better glass forming ability than Cu69Hf31.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Przemyslaw Dziegielewski, Georgos Evangelakis, Jerzy Antonowicz
Summary: Metallic glasses are amorphous solids with liquid-like atomic structure. In this study, molecular dynamics simulations were used to investigate the variations in short-to-medium-range order of three binary Zr-Cu metallic glasses under compression. The results showed structural similarities between different alloys under high pressure, and the topological short-to-medium-range order was found to be composition-independent.
COMPUTATIONAL MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Keita Nomoto, Anna Ceguerra, Christoph Gammer, Bosong Li, Huma Bilal, Anton Hohenwarter, Bernd Gludovatz, Jurgen Eckert, Simon P. Ringer, Jamie J. Kruzic
Summary: The study revealed the hierarchical structure of BMGs through nanobeam electron diffraction experiments, showing that the local hardness of microscale domains decreases with the size and volume fraction of atomic clusters with higher local MRO. A model of ductile phase softening was proposed to enable the design of BMGs in the future by tuning the MRO size and distribution in the nanostructure.
Article
Chemistry, Physical
A. H. Cai, G. Zhou, P. W. Li, D. W. Ding, Q. An, G. J. Zhou, Q. Yang, Y. P. Lin, H. Mao
Summary: The relationship between microstructure and mechanical property of three Zr-based bulk metallic glasses (BMGs) was investigated. The results show that the content of CuZr2-type phase increases but that of Zr6Al2Ni-type phase decreases with increasing Zr content. The plastic flow stress and strain decrease while the plasticity increases with increasing fraction of CuZr2-type cluster, which is named as geometrically unfavorable motifs (GUMs). The fitting parameters from cumulative probability statistics provide valuable clues for investigating the plastic flow and plasticity of the BMGs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Kai-Ming Han, Hui Jiang, Ying-Min Wang, Jian-Bing Qiang
Summary: The addition of Ti was found to significantly affect the glass-forming ability and mechanical properties of Zr63.5-xTixAl9Fe4.5Cu23 BMGs. Higher Ti content initially increased the GFA and room-temperature plasticity of the BMGs, but this trend reversed after reaching a certain threshold. The Zr60.5Ti3Al9Fe4.5Cu23 BMGs showed excellent biocompatibility, biocorrosion resistance, and potential for use in biomedical devices.
Article
Materials Science, Multidisciplinary
S. F. Wei, X. D. Wang, K. K. Qiu, T. D. Xu, Q. P. Cao, S. Q. Ding, D. X. Zhang, J. Z. Jiang
Summary: In this study, the origins of pronounced and unpronounced beta-relaxation behaviors in Y60Ni16Al24 and Y60Fe16Al24 metallic glasses were elucidated using experimental and theoretical approaches. The results indicate that the atomic dynamics of mobile atoms are not only related to their local geometry, but also to their chemical compositions.
Article
Engineering, Manufacturing
Maximilian Frey, Jan Wegner, Erika Soares Barreto, Lucas Ruschel, Nico Neuber, Bastian Adam, Sascha Sebastian Riegler, Hao-Ran Jiang, Gerd Witt, Nils Ellendt, Volker Uhlenwinkel, Stefan Kleszczynski, Ralf Busch
Summary: Laser powder bed fusion of CuTi-based bulk metallic glasses in the Vit101 system has been successfully achieved for the first time, surpassing the mechanical performance of most Zr-based BMGs. The study reveals that thermal stability has a minor role in producing amorphous specimens, while notch toughness is crucial for achieving defect-free parts with high mechanical performance. The results suggest a shift towards toughness-oriented optimization strategies for alloy development in the PBF-LB/M-process, departing from traditional casting-based glass forming ability optimization.
ADDITIVE MANUFACTURING
(2023)
Article
Materials Science, Multidisciplinary
Songling Liu, Xinyu Luo, Jingshan Cao, Zhaoyuan Liu, Beibei Xu, Yonghao Sun, Weihua Wang
Summary: This study evaluates the chemical medium-range ordering in liquid alloys using persistent homology, and finds that in metallic glasses, this ordering is regulated by the activation and inhibition of the constituent components, resulting in a Turing pattern in the topology. The chemical medium-range ordering strongly depends on the elemental types.
MATERIALS TODAY PHYSICS
(2023)
Article
Chemistry, Physical
Mehdi Malekan, Reza Rashidi, Mansoor Bozorg, Nick Birbilis
Summary: The effect of yttrium (Y) on the glass-forming ability (GFA), mechanical properties and corrosion of (Cu50Z-r43Al7)100-xYx alloys was studied. The addition of Y improved the GFA of Cu50Zr43Al7 alloy, with a GFA of 15 mm obtained for (Cu50Zr43Al7)98Y2. The bulk metallic glasses (BMGs) exhibited limited plastic strain but achieved high compressive fracture strength and Young's modulus. The corrosion resistance of the BMGs was improved by the addition of Y.
Article
Materials Science, Multidisciplinary
J. Ding, A. Inoue, S. L. Zhu, S. L. Wu, E. Shalaan, A. A. Al-Ghamdi
Summary: This study investigated the effects of increased aluminum content on the glass-forming ability, microstructure, phase stability, mechanical properties, and deformation behaviors of Zr-rich Zr-Cu-Al alloys in bulk metallic glass composites (BMGCs). It was found that higher aluminum content improved the glass-forming ability of the alloys, leading to the fabrication of BMGCs with enhanced performance. The Zr-rich Zr-Cu-Al BMGCs exhibited a large fracture strain and high fracture strength under compression, with superior plastic deformation capabilities attributed to factors such as the formation of shear bands and interactions between crystals and shear bands.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Jinyue Wang, Xiongjun Liu, Yuan Wu, Hui Wang, Dong Ma, Zhaoping Lu
Summary: By adding a small amount of oxygen into Zr-Cu-based metallic glass, the glass-forming ability and plasticity can be simultaneously enhanced. This is because the oxygen-centered clusters promote structural heterogeneities and increase structural fluctuations, leading to improved plastic deformation in the metallic glass.
Article
Chemistry, Physical
C. R. Onyeagba, M. Valashani, H. Wang, C. Brown, P. Yarlagadda, T. Tesfamichael
Summary: New functional coatings of thin film polymorphic metallic glasses (Ti-Fe-Cu, Zr-Fe-Al, and Zr-W-Cu) were deposited on SS316L and Ti substrates using co-sputtering technique. The films exhibited excellent surface and nanomechanical properties, making them potential functional surfaces for biomedical applications.
SURFACES AND INTERFACES
(2023)
Article
Chemistry, Physical
Zusheng Xiong, Pingjun Tao, Ziyun Long, Zhengyang Huang, Kunhui Long, Xuguang Zhu, Xi Xu, Huanhuan Deng, Haisheng Lin, Weiqiu Li
Summary: In this study, it was found that the mechanical properties of Zr-based alloys, especially the fracture strength, plasticity, indentation hardness, and elastic modulus, were improved by adding a small amount of Ta element.
Article
Materials Science, Ceramics
Zhengyang Huang, Pingjun Tao, Ziyun Long, Zusheng Xiong, Xuguang Zhu, Xi Xu, Zhenghua Huang, Huanhuan Deng, Haisheng Lin, Weiqiu Li, Jiayu Zhang, Haichao Zheng
Summary: The effect of Ti substitution for Cu on the glass forming ability (GFA) and mechanical properties of Zr60Cu(20x)Al10Ni10Tix (x = 0, 1, 3 and 5at.%) bulk metallic glasses (BMGs) was investigated. The addition of Ti improved the GFA of Zr-based BMGs, as indicated by the increase in supercooled liquid region range from 47 K to 79 K. The plasticity and fracture strength of Zr-based BMGs significantly increased with Ti addition, reaching a peak value of 25.3% and 2315 MPa, respectively. The hardness and elastic modulus of Zr-based BMGs were also significantly improved with Ti addition.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Chemistry, Physical
Ziyun Long, Pingjun Tao, Guotai Wang, Kunsen Zhu, Yugan Chen, Weijian Zhang, Zhihao Zhao, Yuanzheng Yang, Zhenghua Huang
Summary: This study reports that microalloying can improve the plasticity of bulk metallic glasses (BMGs) at room temperature. The selection of minor elements Nb and Ta has a positive heat of mixing with the based compositions. The self-organize to a critical state (SOC) occurs in all BMGs, with a constant scaling exponent beta value. The variation of the rotation angle of primary shear bands (SBs) is consistent with plasticity. Meanwhile, the yield strength is linearly dependent on the local fracture toughness of BMGs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Rathinavelu Sokkalingam, Zhao Chao, Katakam Sivaprasad, Veerappan Muthupandi, Jayamani Jayaraj, Parthiban Ramasamy, Juergen Eckert, Konda Gokuldoss Prashanth
Summary: CoCrFeMnNi high-entropy alloy/AISI 316L stainless steel bimetal was fabricated using SLM, showing enhanced hardness and tensile strength due to the composition and structure advantages. However, the presence of defects and higher susceptibility to pitting corrosion in CoCrFeMnNi-HEA make it more prone to corrosion attack in corrosive environments.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Physical
Zequn Zhang, Simon Fellner, Sergey Ketov, Megan J. Cordill, Huaping Sheng, Christian Mitterer, Kaikai Song, Christoph Gammer, Juergen Eckert
Summary: The phase evolution of alloys and atomic diffusion are closely related. However, the influence of reactive diffusion on phase formation in high-entropy alloys (HEAs) is still not clear. This study investigates the phase evolution of a multicomponent CoCrFeNi/Al diffusion couple and reveals the combined effects of enthalpy and entropy on phase formation in HEAs at elevated temperatures. Surface modification of HEAs can be achieved through film deposition and annealing processes.
Review
Electrochemistry
Baran Sarac, A. Sezai Sarac, Juergen Eckert
Summary: This review provides an introduction to the use of advanced amorphous metal catalysts for hydrogen storage and production via electrochemistry. Pd-based metallic glasses have gained significant attention due to their unique atomic structure and properties for energy applications. The review covers the fabrication techniques, hydrogen sorption, hydrogen evolution, kinetics, and future prospects of Pd-based metallic glasses. Overall, it offers a comprehensive overview for large-scale hydrogen energy storage and production systems.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Ming-Zhi Zhang, Kun Zhang, Kai-Kai Song, Xiao-Yu Zou, Wei-Dong Song, Ke-Feng Li, Li-Na Hu, Ze-Qun Zhang, Juergen Eckert
Summary: In this study, CoCrFeMnNi high-entropy alloys with a surface gradient nanostructure were produced using industrial shot blasting, which significantly improved their mechanical properties. The severely plastically deformed surface layer had a multi-scale hierarchical structure and increased in depth with shot-blasting time. The microhardness and tensile strength of the alloy were significantly higher after shot-blasting. The improved strain hardening and prevention of early necking in the gradient-nanostructured surface layer contributed to its high toughness.
Article
Chemistry, Physical
Monika Antoni, Florian Spieckermann, Niklas Plutta, Christoph Gammer, Marlene Kapp, Parthiban Ramasamy, Christian Polak, Reinhard Pippan, Michael J. J. Zehetbauer, Juergen Eckert
Summary: The effects of severe plastic deformation (SPD) by means of high-pressure torsion (HPT) on Fe73.9Cu1Nb3Si15.5B6.6 and Fe81.2Co4Si0.5B9.5P4Cu0.8 iron-based metallic glasses were compared. HPT processing extended the consolidation and deformation ranges for Fe73.9Cu1Nb3Si15.5B6.6, and achieved consolidation and deformation with minimum cracks for Fe81.2Co4Si0.5B9.5P4Cu0.8 for the first time. Various analyses revealed that Fe81.2Co4Si0.5B9.5P4Cu0.8 exhibited HPT-induced crystallization phenomena, while Fe73.9Cu1Nb3Si15.5B6.6 did not crystallize even at high HPT-deformation degrees.
Editorial Material
Chemistry, Multidisciplinary
Juergen Eckert, Daniel Kiener
Article
Chemistry, Physical
Keziban Huner, Baran Sarac, Eray Yuece, Amir Rezvan, Matej Micusik, Maria Omastova, Juergen Eckert, A. Sezai Sarac
Summary: The incorporation of iron and carboxylic acid-functionalized polyaniline into polymeric polycaprolactone structures enhances the electron-donating ability and conductivity of the compound, making it suitable for electrochemical immunosensors.
MOLECULAR SYSTEMS DESIGN & ENGINEERING
(2023)
Article
Chemistry, Physical
Konrad Kosiba, Denys Y. Kononenko, Dmitry Chernyavsky, Liang Deng, Jozef Bednarcik, Junhee Han, Jeroen van den Brink, Hwi Jun Kim, Sergio Scudino
Summary: Due to layer-by-layer processing, laser powder bed fusion (LPBF) can overcome the size limitation of bulk metallic glasses (BMGs) caused by high cooling rates. However, fabricating amorphous and highly dense parts via LPBF is challenging because the processing parameters affect both requirements in a contrasting manner. In this study, specimens of the glass-forming Zr52.5Cu17.9Ni14.6Al10Ti5 alloy were fabricated using LPBF under varying processing conditions. Processing maps of amorphicity and density were provided and evaluated in terms of porosity, structural relaxation, and crystallization. Optimal processing conditions for maximizing density and amorphicity were identified. The dataset helps quantify the correlation between relative density, amorphicity, volumetric energy density, and normalized enthalpy criteria. Pearson and Spearman correlation analyses revealed an equally strong dependence between these criteria and relative density, and an inverse moderate dependence with amorphicity. A modified enthalpy criterion, which correlates strongest with density among the non-dimensional parameters, was derived based on the results.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Debottam Goswami, Santanu Chattopadhyay, Jayanta Das
Summary: We report the modification of martensitic transformation in Ni-Mn-Sn ribbons by controlling the post annealing cooling rate. Furnace-cooled sample exhibited the highest austenite stabilization and the lowest martensitic transformation temperature of 200.2 K, whereas air-cooled sample exhibited the highest transformation temperature of 298.5 K. The martensite evolved as ferromagnetic clusters in an anti-ferromagnetic matrix in the samples with high atomic disorder, whereas long-range anti-ferromagnetic correlations developed in the highly ordered samples.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Engineering, Chemical
Radovan Bures, Maria Faberova, Zuzana Bircakova, Jozef Bednarcik, Vasily Milyutin, Ivan Petryshynets, Peter Kollar, Jan Fuezer, Michaela Dilyova-Hatrakova
Summary: This paper investigates the pressing and densification of pure powder iron at relatively high pressure before heat treatment. The functional properties of soft magnetic materials and composites strongly rely on the pressing parameters. The study analyzes the correlation between microstructure, density, mechanical and magnetic properties with pressing pressure, and identifies the densification mechanisms through compressibility analysis. The wider the range of pressing pressure, the higher the polynomial dependence observed in the densification process, which is associated with changes in microstructure and porosity. The distribution of density for each shape of the green compact influences the magnetic and electrical properties.
Article
Engineering, Manufacturing
Ruiqi Wang, Lixia Xi, Lili Feng, Baran Sarac, Konda Gokuldoss Prashanth, Juergen Eckert, Dongdong Gu
Summary: Dual-phase reinforcing approach is an efficient strategy for fabricating advanced aluminum matrix composites. However, designing a dual-phase reinforcing system with synergistic strengthening effect for LPBF process is challenging.
3D PRINTING AND ADDITIVE MANUFACTURING
(2023)
Article
Materials Science, Multidisciplinary
Xintian Wang, Zhiyong Ji, Robert O. Ritchie, Ilya Okulov, Juergen Eckert, Chunlei Qiu
Summary: In this study, TiAl and Cr3C2 particles were added to a CrMnFeCoNi alloy to improve its processibility and mechanical properties. The addition of TiAl particles resulted in the formation of cracks, but the further addition of Cr3C2 particles helped suppress hot cracking. The presence of long-range ordered domains and precipitates contributed to the improved strength of the dual-particle containing alloy.
MATERIALS TODAY ADVANCES
(2023)
Article
Materials Science, Multidisciplinary
Konrad Kosiba, Daniel Wolf, Matthias Bonisch, Kai Neufeld, Ruben Huehne, Tobias Gustmann, Jozef Bednarcik, Hongyu Chen, Xiaoliang Han, Volker Hoffmann, Lukas Beyer, Uta Kuehn, Sergio Scudino, Lars Giebeler, Julia K. Hufenbach
Summary: This study demonstrates the successful fabrication of dense parts (99.8%) by LPBF using Fe85Cr4Mo1V1W8C1 high-carbon steel. The LPBF-fabricated steel shows good mechanical and wear performance, indicating its potential application in tooling.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Baran Sarac, Remzi Gurbuz, Matej Micusik, Maria Omastova, Amir Rezvan, Eray Yuece, Lixia Xi, Juergen Eckert, Ali Ozcan, A. Sezai Sarac
Summary: This study focuses on the synthesis and properties comparison of a novel organic composite nanofiber material consisting of styrene-butadiene-styrene (SBS) copolymer blended with polystyrene (PStyr) and carbon nanotubes (CNTs). The addition of CNTs retards the crystallization process and decreases the absorbance of both SBS/PStyr and PStyr/PBu in Fourier transform infrared spectroscopy. The interaction of CNTs with the blend is limited in samples with SBS, as observed in Raman spectroscopy.
MOLECULAR SYSTEMS DESIGN & ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Debottam Goswami, Parijat P. Jana, Gaurav Potnis, Partha Kumbhakar, Debabrata Ganguly, Santanu Chattopadhyay, Jayanta Das
Summary: This article presents a low-cost and scalable method for developing magnetocaloric composites with thermal conductivity and mechanical strength. By incorporating graphene-like nanostructures synthesized from discarded sugarcane into a polysulfone matrix, efficient thermal bridges/pathways are formed, resulting in an enhanced thermal conductivity of the composites.
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.
