Article
Materials Science, Ceramics
Boren Ke, Wei Ji, Ji Zou, Weimin Wang, Zhengyi Fu
Summary: Highly dense zirconium carbide (ZrC) ceramics were obtained by spark plasma sintering (SPS) at low temperatures (1900°C) and high pressure (up to 200 MPa) using a carbon-fiber-reinforced carbon composite (C-f/C) mold. The ceramics showed limited grain growth and the formation of subgrains and high-density dislocations. The resulting ZrC ceramics exhibited high hardness and fracture toughness. The densification mechanism was mainly attributed to plastic deformation under high pressure, with the high dislocation density contributing to the high hardness.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Engineering, Chemical
Yingji Bao, Binsong Jiang
Summary: This paper investigates the plastic deformation of rock and constructs an elasto-plastic incompatible model, while also examining the stress and deformation of a thick-walled cylinder under hydrostatic pressure using a finite element program. The results reveal a relationship between plastic strain and defect distribution, impacting the deformation of rocks.
Article
Engineering, Manufacturing
Kaiwen Zhang, Wei Zhang, Ryan Brune, Edward Herderick, Xu Zhang, John Cornell, Joy Forsmark
Summary: This paper studied the densification and deformation behaviors of green parts printed by Binder Jetting-Metal Additive Manufacturing (BJ-MAM) during pressureless sintering. Experimental and modeling methods were used to analyze the deformation and shrinkage of parts with different geometries after sintering.
ADDITIVE MANUFACTURING
(2021)
Article
Materials Science, Ceramics
Yi Zheng, Ji Zou, Wei Liu, Weimin Wang, Wei Ji, Zhengyi Fu
Summary: In this study, TaC ceramics with high density and fine grains were successfully fabricated by high pressure sintering. The as-sintered specimen exhibited a high dislocation density and excellent hardness. Moreover, the electrical conductivity was improved. High pressure sintering was found to be effective in promoting densification and limiting grain growth. This work provides valuable insights for the fabrication of fully dense structural ceramics with fine grains.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Yulin Li, Ji Zou, Qiqi Zhu, Weiming Guo, Weimin Wang, Wei Ji, Zhengyi Fu
Summary: Fully dense oriented monolithic zirconium diboride ceramics with fiber texture were successfully fabricated through high-pressure spark plasma sintering, and the mechanism of fiber texture formation was proposed. This result provides evidence for plastic deformation during high-pressure-assisted sintering.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Computer Science, Interdisciplinary Applications
Acar Can Kocabicak, Magd Abdel Wahab
Summary: This paper investigates the plastic deformation mechanism, hardness and mechanical properties, stress distribution, and strain of AISI 5140 steel during flow forming process through experimental and numerical simulation. The results show significant improvement in hardness and mechanical properties of the part after flow forming.
SIMULATION MODELLING PRACTICE AND THEORY
(2022)
Article
Nanoscience & Nanotechnology
Joonas Lehtonen, Pauli Lehto, Yanling Ge, Aapo Juselius, Simo-Pekka Hannula
Summary: Pulsed electric current sintering of gas atomized powder can achieve an equiatomic CrFeNiMn alloy, with ball milling of the starting powder leading to increased density and hardness, as well as decreased grain size of the sintered material. The decrease in grain size suppresses deformation twinning and promotes dislocation cell formation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Composites
Jagan Selvaraj, Luiz F. Kawashita, Mehdi Yasaee, Gordon Kalwak, Stephen R. Hallett
Summary: A novel cohesive element formulation is proposed for modelling composite delamination, offering increased stability and requiring fewer elements. This new formulation combines nodal rotations and multiple integration points to improve the accuracy of delamination propagation simulation.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Jose Antonio Bejarano-Palma, Bibi Malmal Moshtaghioun, Francisco Luis Cumbrera, Diego Gomez-Garcia
Summary: This paper models the growth of ceramic grains in field-assisted sintering techniques using a phase-field model. The results show that strong electric fields affect the sintering process and retard grain growth, contrary to usual statements. The authors propose a hypothesis that non-homogeneities of transport properties at the grains can act as a driving force for sintering.
Article
Chemistry, Multidisciplinary
Haiyue Xu, Wei Ji, Weiming Guo, Yulin Li, Ji Zou, Weimin Wang, Zhengyi Fu
Summary: In this study, fully dense and grain-refined ZrB2 material with excellent mechanical and oxidation-resistant properties is prepared under ultra-high pressure at low temperature. The refined grains, substructures, and high dislocation density contribute to the enhancement of mechanical properties. The unique structure of ZrB2 leads to a significant increase in oxidation threshold temperature.
Article
Materials Science, Multidisciplinary
Yue Sun, Chang Zhou, Zimin Zhao, Gaohui Wu
Summary: Ti2AlC/Al composites with 20 vol% Ti2AlC particles were fabricated using spark plasma sintering and hot extrusion, showing high tensile ductility at 590°C sintering temperature due to the good interfacial bonding and uniform strain distribution. The ability of Ti2AlC layered structure to kink and delaminate also contributes to the high plasticity.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Isacco Mazo, Barbara Palmieri, Alfonso Martone, Michele Giordano, Vincenzo M. Sglavo
Summary: Flash sintering is a powerful tool for rapid consolidation of green ceramic compacts, but its activation mechanisms in PTC materials are not well understood. This study investigates the thermal runaway phenomenon and its activation conditions in binderless WC green bodies using numerical simulations. It is found that during the flash event, WC green samples can reach very high temperatures in the range of 1800-2000 degrees C within a few seconds.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Mechanical
S. Falco, N. Fogell, S. Kasinos, L. Iannucci
Summary: This paper presents an approach to evaluate the macroscopic properties of ceramic materials based on micromechanical simulations performed on Representative Volume Elements (RVEs). The results show good agreement between numerical simulations, experimental measurements, and analytical calculations, providing an effective prediction of elastic deformation and brittle failure behavior.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Materials Science, Multidisciplinary
Zhangtian Wu, Wei Ji, Jinyong Zhang, Yanan Yuan, Ji Zou, Weimin Wang, Zhengyi Fu
Summary: In this work, dense and grain-refined nanocrystalline (La0.2Nd0.2Sm0.2Gd0.2Eu0.2)2Zr2O7 ceramics were prepared with ultra-high pressure sintering (UHPS) method under 10 GPa at a low temperature of 800°C. The grain size of the prepared ceramic was only 151 nm, which is 40% smaller than that of the raw powder. In addition, it exhibited advantageous properties including both high hardness and aqueous durability.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Optics
Zhaoyang Zhai, Quyuan Fan, Yajing Qu, Huaming Zhang, Yanchao Zhang, Yahui Cui
Summary: The thermal effect of silicon carbide fiber reinforced silicon carbide (SiC/SiC) during the processing of nanosecond lasers with different wavelengths was studied. The influence of SiC fiber bundle on energy distribution in SiC/SiC composites was found, and the heat tends to transfer along the longitudinal direction of the fiber bundle. Water solution was found to improve the quality of the microstructure by reducing the accumulation of melt and avoiding processing damage caused by thermal effect.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Nanoscience & Nanotechnology
Martin Ihrig, Liang-Yin Kuo, Sandra Lobe, Alexander M. Laptev, Che-an Lin, Chia-hao Tu, Ruijie Ye, Payam Kaghazchi, Luca Cressa, Santhana Eswara, Shih-kang Lin, Olivier Guillon, Dina Fattakhova-Rohlfing, Martin Finsterbusch
Summary: All-solid-state lithium batteries are promising for energy storage, but suffer from performance degradation during cycling. This study shows that thermal recovery can recrystallize the amorphized interface, restoring the cell performance. Detailed analysis and thermodynamic modeling provide a comprehensive understanding of the structural and chemical changes. Through thermal recovery, more than 80% of the initial storage capacity can be recovered, offering potential for cost-efficient recycling of ceramic all-solid-state batteries.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Ceramics
Maria Wisniewska, Alexander M. Laptev, Mateusz Marczewski, Volf Leshchynsky, Grzegorz Lota, Ilona Acznik, Luca Celotti, Alex Sullivan, Miroslaw Szybowicz, Dariusz Garbiec
Summary: Carbon nanotubes (CNTs) are widely used in ceramic-matrix composites (CMC) as a filler. They have high thermal conductivity individually, but only have a moderate influence on the thermal conductivity of CMCs. However, even a small quantity of CNTs can significantly increase the electrical conductivity of CMCs. The present study investigates the influence of multi-wall carbon nanotubes (MWCNTs) on the thermal and electrical conductivity of ZrO2-CNTs composites, revealing the contradictory effects of CNTs on these properties.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Zahid Anwer, Jozef Vleugels, Amit Datye, Shuhan Zhang, Shuigen Huang
Summary: The influence of varying carbon content on the microstructure and mechanical properties in the (V, Nb,Ta,Ti,W)C -12 vol% Ni system was investigated. The results revealed the impact of carbon content on eutectic temperature, carbide grain size and morphology, phase stability, and mechanical properties in high entropy carbide (V,Nb,Ta,Ti,W)C-Ni cermets. Additionally, the phase stability and chemical reactivity with steel of the High Entropy Carbide (HEC) cermets were assessed and compared to conventional WC-Co cemented carbides at 1200 degrees C.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Ahmed Selema, Margherita Beretta, Matty Van Coppenolle, Hans Tiismus, Ants Kallaste, Mohamed N. Ibrahim, Marleen Rombouts, Jozef Vleugels, Leo A. I. Kestens, Peter Sergeant
Summary: Nowadays, surpassing conventional 2D laminated structures is crucial for enhancing the functionality of electrical machines in the design process. Additive manufacturing (AM) provides unparalleled 3D freedom for processing metal-based materials, optimizing weight and cost effectiveness. This study focuses on 3D printing and testing of ferromagnetic material. Different parts are built using silicon steel (Fe-3wt%Si) powder through various AM techniques, and their magnetic properties are measured and compared. The results demonstrate the potential of AM technology in manufacturing magnetic materials, as well as the good magnetic properties achieved from the 3D printed samples. The study also highlights the possibilities of 3D multi-material printing for electrical machines.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Rui Xi, Hao Jiang, Sergey Kustov, Zhihui Zhang, Guoqun Zhao, Kim Vanmeensel, Jan Van Humbeeck, Xiebin Wang
Summary: NiTiNb alloys were fabricated through L-PBF with powder mixtures of prealloyed NiTi and elemental Nb powders. The addition of Nb significantly altered the dependence of MTTs on L-PBF process parameters. The net effect of Nb addition is to lower MTTs, while Ni evaporation has the opposite effect. In NiTiNb3 alloys, factors that promote and suppress MTTs are almost completely compensated, resulting in a rather stable MTT despite variations in L-PBF process parameters.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Physical
Jide Han, Berfu Goksel, Shiva Mohajernia, Manuela Sonja Killian, Jozef Vleugels, Annabel Braem, Sylvie Castagne
Summary: Zirconia toughened alumina (ZTA) is commonly used in hip joint implants and cutting tools due to its unique properties. The difference in material properties between zirconia and alumina phases leads to the selectivity of phase melting and the disintegration of alumina grains during laser processing. This selective phase melting phenomenon makes the material removal mechanism of the nanocomposite significantly different from that of single-phase materials.
APPLIED SURFACE SCIENCE
(2023)
Article
Dentistry, Oral Surgery & Medicine
Masanao Inokoshi, Hengyi Liu, Kumiko Yoshihara, Mao Yamamoto, Watcharapong Tonprasong, Yasuhiko Benino, Shunsuke Minakuchi, Jef Vleugels, Bart Van Meerbeek, Fei Zhang
Summary: This study investigated crystallography, translucency, phase content, microstructure and flexural strength of two commercial strength-gradient multilayered dental zirconia grades. The results showed that the 'enamel' layer contains a higher amount of c-ZrO2, resulting in higher translucency but lower flexural strength. The strength-gradient approach allowed for integration of monoliths with irreconcilable properties.
Article
Materials Science, Multidisciplinary
Gamze Colak, Gregory Leinders, Jef Vleugels, Remi Delville, Marc Verwerft
Summary: A hybrid route combining internal gelation and a single-step infiltration was investigated to prepare U1-yNdyO2-x sintered microspheres as a surrogate for U1-yAmyO2-x transmutation targets. The use of starch as a pore-forming agent in the internal gelation process for fabricating porous uranium oxide microspheres has been studied in detail. High accessible porosity levels were measured after calcination, allowing efficient infiltration behavior and achieving high average dopant levels up to y = 30 mol% after sintering.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Materials Science, Ceramics
Jinhua Huang, Shuigen Huang, Jef Vleugels
Summary: By using thermodynamic simulation, NbC-Ni based cermets with different W and C additions were designed and sintered in liquid state, resulting in varied phase constitution, microstructure, and mechanical properties. Microscopic analysis revealed the presence of cubic (Nb,W)C solid solution, Ni alloy binder, and carbon-deficient phase in the cermets. Additionally, mechanical properties such as hardness, toughness, and strength were found to be influenced by the phases and NbC grain size.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Maoyin Li, Bensu Tunca, Bart Van Meerbeek, Jef Vleugels, Fei Zhang
Summary: This study proposes a simpler and more controllable method to improve the mechanical properties of conventional ceria-stabilized tetragonal zirconia (Ce-TZP) by doping aliovalent oxides that can segregate at the zirconia-grain boundaries. It is found that doping with calcium and magnesium can change the microstructure and transformation behavior of the material, enabling ceramic materials to undergo inelastic deformation to a certain extent, thereby achieving the optimal combination of toughness, biaxial strength, and damage tolerance.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Engineering, Manufacturing
Guichuan Li, Bensu Tunca, Seren Senol, Massimiliano Casata, Yi Wu, Zhe Chen, Kim Vanmeensel
Summary: The microstructural evolution and precipitation behavior in age-hardenable TiB2/Al-Zn-Mg-Cu composites manufactured using L-PBF were studied. The composites exhibited a fine equiaxed microstructure with TiB2 particles, resulting in improved hardness compared to unreinforced alloys. The precipitation behavior of the composite was accelerated, mainly due to heterogeneous precipitation on the TiB2 particles and enhanced diffusion along grain boundaries.
ADDITIVE MANUFACTURING
(2023)
Article
Materials Science, Multidisciplinary
J. H. Huang, S. G. Huang, J. Vleugels
Summary: Binderless NbC with 0-25 wt% WC powder mixtures were pressureless sintered in vacuum at different temperatures to generate open porosity (Nb,W)C skeletons. The formation of residual minor amounts of W2C and WC was discussed and compared with thermodynamic predictions. The microstructure of the as-sintered homogeneous (Nb,W)C grains in the skeleton changed after Cu infiltration due to the partial dissolution of Nb. The properties of the as-sintered porous and Cu-infiltrated materials were evaluated and discussed.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
D. Lunt, R. Thomas, D. Bowden, M. T. P. Rigby-Bell, S. de Morae Shubeita, C. Andrews, T. Lapauw, J. Vleugels, J. Quinta da Fonseca, K. Lambrinou, P. Frankel
Summary: This work proposes a novel approach to detect strain localisation caused by irradiation-induced damage in nuclear materials on the microstructural level. High-resolution digital image correlation (HRDIC) is used to determine local strains and generate high-resolution strain maps, which can help understand the effects of irradiation-induced dimensional change and cracking. The combination of scanning electron microscopy (SEM) and HRDIC is demonstrated to measure irradiation-induced dimensional changes in three different materials and is crucial in designing microstructures that are structurally resilient during irradiation.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Optics
Jide Han, Jozef Vleugels, Annabel Braem, Sylvie Castagne
Summary: Inspired by the applications of metal-dielectric nanocomposite materials, the study investigated the ultrashort single pulse laser irradiation of zirconia-alumina nanocomposite with band gap contrast. It was observed that the higher melting point zirconia phase melted while the lower melting point alumina phase remained intact, suggesting a significant temperature heterogeneity in the composite. Theoretical modeling revealed that the material band gap plays a significant role in laser energy absorption, resulting in a remarkable temperature difference between the two phases.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Engineering, Manufacturing
Seren Senol, Antonio Cutolo, Amit Datye, Brecht Van Hooreweder, Kim Vanmeensel
Summary: This paper investigates the impact of applying a hybrid laser processing technique on the surface modification of aluminum-based composite materials in the laser powder bed fusion process. The significantly improved fatigue performance of the modified composite parts is attributed to the substantial reduction in surface roughness and stress concentration factor.
VIRTUAL AND PHYSICAL PROTOTYPING
(2023)
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.
