Article
Nanoscience & Nanotechnology
Chanho Lee, Gian Song, Michael C. Gao, Lizhi Ouyang, Ke An, Saryu J. Fensin, Peter K. Liaw
Summary: The study found that the addition of Zr leads to a transition in the mechanical response of NbTaTiV alloy from ductile to brittle behavior. Lattice-strain evolutions obtained from in-situ neutron diffraction for NbTaTiV alloy exhibit atypical plastic-deformation behavior.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Yusuke Onuki, Kasumi Masaoka, Shigeo Sato
Summary: The texture and microstructure formation of a Ca-added alloy, AZX612, during uniaxial tensile deformation at elevated temperatures is reported. The total elongation increases with temperature primarily due to prolonged unstable plastic deformation. The significant elongation at high temperatures is attributable to the relaxation of strain concentration via continuous dynamic recrystallization.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Carla Isabel Pinilla Ducreux, Ahmed A. Saleh, Azdiar A. Gazder, Elena Pereloma
Summary: The deformation behavior of a metastable beta Ti-10V-2Fe-3Al alloy was studied, showing that the formation of α'' martensite fiber is related to variant selection, beta lattice parameter increases while alpha '' accommodates deformation through adjusting lattice parameters.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Zifan Wang, Jingwei Chen, Cyril Besnard, Lenka Kuncicka, Radim Kocich, Alexander M. Korsunsky
Summary: The study revealed that the hot swaging process led to changes in grain morphology and an increase in microstrain. The thermal expansion coefficients of martensite and austenite variants were weakly affected by texture, and the reorientation of martensite was weakly related to the initial microstructure and showed correlation with detwinning.
Article
Nanoscience & Nanotechnology
Kodjo Emmanuel Agbovi, Baptiste Girault, Jamal Fajoui, Saurabh Kabra, Winfried Kockelmann, Thomas Buslaps, Agnieszka Poulain, David Gloaguen
Summary: Neutron and high-energy X-ray diffraction methods were used to investigate deformation mechanisms during uniaxial tensile tests of Grade 1 commercially pure titanium. Results showed good agreement between simulations and experimental data, and the EPSC model accurately predicted lattice strains, grain reorientation, and macroscopic stress-strain response. Study on two different textured products evaluated the influence of texture on mesoscopic and macroscopic responses of Ti-alpha alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Wu Gong, Stefanus Harjo, Yo Tomota, Satoshi Morooka, Takuro Kawasaki, Akinobu Shibata, Nobuhiro Tsuji
Summary: The martensitic transformation is accompanied by the generation of internal stresses at both microscale and macroscale during cooling. Previous studies using X-ray or neutron diffraction have reported inconsistent results due to the influence of factors such as solute elements and crystal defects on the measured lattice parameter.
Article
Materials Science, Multidisciplinary
Stephen B. Puplampu, Dayakar Penumadu, Matthew Frost, Ke An
Summary: The lattice-specific elastic stiffnesses of a structural alloy with various applications are investigated using neutron and X-ray diffraction techniques. The study reveals the macroscopic mechanical properties and thermally induced strains response of the material, and identifies that the (101) reflection best matches the overall material behavior.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Eric Hoar, Souvik Sahoo, Mostafa Mahdavi, Steven Liang, Shibayan Roy, Hamid Garmestani
Summary: A statistical continuum model utilizing microstructural information is developed to simulate the microstructure evolution of a two-phase Ti-6Al-4V alloy during hot isothermal compression. This model does not rely on finite element methods, making it faster and more resource-efficient for prediction accuracy. The model uses two-point statistics to describe microstructural information related to phase distribution, grain size, and phase/grain morphology, and utilizes macroscopic strain-rate tensor to predict deformation.
Article
Materials Science, Multidisciplinary
Qichang He, Xiangyu Zhou, Xiaodan Zhang, Chuhao Liu, Huamiao Wang
Summary: Magnesium alloys, as the lightest structural metals, have gained significant attention in various fields. In this study, uniaxial tension and compression tests were conducted on hot-rolled magnesium alloy plates, and neutron diffraction experiments were employed to characterize the evolution of macroscopic mechanical response and microscopic mechanisms. Additionally, a twinning and detwinning (TDT) model based on the elastic visco-plastic self-consistent (EVPSC) model has been proposed to provide a comprehensive understanding of the inelastic behavior of magnesium alloys from multiple perspectives.
Article
Engineering, Mechanical
Rachel E. Lim, Darren C. Pagan, Joel Bernier, Paul A. Shade, Anthony D. Rollett
Summary: High-energy synchrotron x-rays are used to track the evolution of grain-averaged lattice reorientation and stress-state in Ti-7Al during cyclic loading. Accumulating plastic strain is observed even when the sample did not exceed its elastic limit. The largest changes in lattice orientation and stress state occur after the first cycle, followed by a slower evolution in subsequent cycles. The variation of axes for lattice reorientation is highly dependent on the maximum resolved shear stress and activation of different slip systems.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Chemistry, Physical
Yubi Gao, Yutian Ding, Haifeng Li, Hongbiao Dong, Ruiyao Zhang, Jun Li, Quanshun Luo
Summary: The study found that grain refinement can enhance the elastic modulus and yield strength of Inconel 625 alloy, as well as improve the consistency of polycrystalline deformation. The deformation mechanism of coarse-grained samples is mainly influenced by stacking faults and dislocations, while fine-grained samples only involve dislocation slipping.
Article
Materials Science, Multidisciplinary
Zifan Wang, Jingwei Chen, Oxana V. Magdysyuk, Fatih Uzun, Alexander M. Korsunsky
Summary: This paper introduces a new method to extract texture information from single shot diffraction patterns and demonstrates another texture analysis method based on single shot X-ray diffraction. The effectiveness of both methods is proven through evaluation on polycrystalline nickel-based superalloy samples. Additionally, a new metric is proposed to quantify the matching quality of pole figures.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Longmeng Xu, Yuming Bai, Gaoshang Gong, Fangyuan Song, Zhaohu Li, Yuyan Han, Langsheng Ling, Zhaoming Tian
Summary: The study investigates the anisotropic Hall effect in the longitudinal conical-ordered magnet CeMn2Ge2 and demonstrates the realization of a room-temperature anisotropic topological Hall effect (THE). The findings open up possibilities for designing spintronic devices based on THE.
Article
Nanoscience & Nanotechnology
Hao Yang, Huamiao Wang, Zhaolong Yang, Yalin Huang, Dayong Li, Yinghong Peng, Peidong Wu
Summary: The microstructure evolution of Q&P1180 steel during uniaxial tension was comprehensively investigated, with tiny blocky retained austenite (RA) islands distributed in the matrix transforming into martensite during deformation. Experimental and model discussions focused on the effects of phase transformation on the stress-strain response and texture evolution of Q&P1180.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Mechanical
Harry Coules, Molly Probert, Kisaburo Azuma, Christopher Truman, Cui Er Seow, Thilo Pirling, Sandra Cabeza
Summary: Fatigue crack growth in thick-section metals is controlled by an internal plane strain region with strong triaxial constraint at the crack tip. Neutron diffraction was used to study this plane strain region of in situ fatigue crack tips. By developing a stroboscopic form of neutron diffraction, crack tip strains as a function of phase in the fatigue loading cycle were measured without interrupting the cyclic load. Point measurements of near-tip strain in 7475-T7351 aluminium alloy and finite element analysis confirmed that the crack tip plastic zone is small for this material and set of loading conditions.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
X. Li, S. R. Holdsworth, S. Kalacska, L. Balogh, J-S Park, A. S. Sologubenko, X. Maeder, S. Kabra, E. Mazza, E. Hosseini
Summary: Primary creep regeneration (PCR) is a phenomenon observed during stress-varying/cyclic creep loading conditions, where changes in dislocation density and activation of dislocation generation and recovery mechanisms can lead to the regeneration of the primary creep regime. These mechanisms can explain the observed creep strain accumulation in the steel under stress-varying creep loading conditions.
MATERIALS & DESIGN
(2021)
Article
Engineering, Mechanical
Mehdi Mokhtarishirazabad, Chris Simpson, Saurabh Kabra, Graeme Horne, Iain Palmer, Andrew Moffat, Christopher Truman, David Knowles, Mahmoud Mostafavi
Summary: The study found that the residual stresses in 316L electron beam weldments were biaxial, and the fracture resistance of the weldment and parent material was similar, with material microstructure differences being more significant than the measured residual stresses. The research suggests that 316L electron beam weldments are not susceptible to fracture failure due to their high ductility and ability to relieve residual stresses through gross plasticity, making electron beam welding a reliable manufacturing technology for safety critical 316L components.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2021)
Article
Instruments & Instrumentation
R. S. Ramadhan, S. Cabeza, T. Pirling, S. Kabra, M. Hofmann, J. Rebelo Kornmeier, A. M. Venter, D. Marais
Summary: Positional accuracy is a crucial parameter in neutron diffraction residual stress investigations, requiring precise measurements of strains at localized positions along multiple sample orientations. A standardized approach has been developed for quantitative analysis of positional accuracy on neutron strain scanners, using specific sample sets with geometries for assessment of alignment procedures and accuracies. The method has been implemented on four instruments to achieve comparable performance with positional accuracies around 100 µm, confirming the high precision attainable for non-destructive stress determination.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2021)
Article
Materials Science, Multidisciplinary
H. E. Coules, S. O. Nneji, J. A. James, S. Kabra, J. N. Hu, Y. Wang
Summary: The study focused on validating constitutive laws for multiaxial deformation, particularly creep deformation, by measuring the evolution of stress tensors within a material. The combination of neutron diffraction and finite element analysis was found to reduce stress uncertainty and provide insights into the accuracy of the creep constitutive model. The study concluded that sequential neutron diffraction stress measurements can be used to validate material constitutive laws in situations involving multiaxial deformation.
EXPERIMENTAL MECHANICS
(2022)
Article
Nanoscience & Nanotechnology
Kodjo Emmanuel Agbovi, Baptiste Girault, Jamal Fajoui, Saurabh Kabra, Winfried Kockelmann, Thomas Buslaps, Agnieszka Poulain, David Gloaguen
Summary: Neutron and high-energy X-ray diffraction methods were used to investigate deformation mechanisms during uniaxial tensile tests of Grade 1 commercially pure titanium. Results showed good agreement between simulations and experimental data, and the EPSC model accurately predicted lattice strains, grain reorientation, and macroscopic stress-strain response. Study on two different textured products evaluated the influence of texture on mesoscopic and macroscopic responses of Ti-alpha alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Nitesh Raj Jaladurgam, Saurabh Kabra, Magnus Hornqvist Colliander
Summary: In-situ neutron diffraction was conducted during tensile deformation of a Ni-based superalloy, revealing changes in yield strength, ductility, and microstructural features at different temperatures. The study found that load redistribution and plastic deformation of gamma' phase varied with temperature and microstructure, impacting the material's mechanical behavior.
MATERIALS & DESIGN
(2021)
Article
Engineering, Biomedical
Sarah Iaquinta, Shahram Khazaie, Elena Ishow, Christophe Blanquart, Sylvain Freour, Frederic Jacquemin
Summary: In this paper, the influence of nanoparticles' mechanical and geometrical properties on their cellular uptake was numerically investigated. The results revealed that the aspect ratio of the particle had the greatest impact on the wrapping of the particle by the cell membrane, with adhesion contributing twice as much as membrane tension.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING
(2022)
Article
Nanoscience & Nanotechnology
Lei Tang, Fuqing Jiang, Huibin Liu, Saurabh Kabra, Biao Cai
Summary: High manganese steels, with low production cost and potential for excellent strength-ductility combinations, are being recognized as promising structural materials for cryogenic applications. The addition of 1 wt% Cu to the steel effectively improves yield strength (YS) and elongation, and increases stacking fault energy (SFE), delaying the formation of martensite. At lower deformation temperatures, tensile strength increases linearly, while stacking faults and dislocations are promoted, and SFE decreases linearly. Contributions to YS and flow stress from lattice friction, grain boundary, dislocation, deformation twins, and phase transformation were determined.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Mohd Izrul Izwan Ramli, Mohd Arif Anuar Mohd Salleh, Mohd Mustafa Al Bakri Abdullah, Ikmal Hakem Aziz, Tan Chi Ying, Noor Fifinatasha Shahedan, Winfried Kockelmann, Anna Fedrigo, Andrei Victor Sandu, Petrica Vizureanu, Jitrin Chaiprapa, Dumitru Doru Burduhos Nergis
Summary: Geopolymer materials are low-carbon construction materials. Alkali-activated kaolin, a type of geopolymer material, is a viable alternative for high-strength ceramics. This study analyzed the sintering process and pore structure of alkali-activated kaolin, revealing the effects of different sintering temperatures on pore distribution.
Article
Materials Science, Multidisciplinary
L. Tang, F. Q. Jiang, J. S. Wrobel, B. Liu, S. Kabra, R. X. Duan, J. H. Luan, Z. B. Jiao, M. M. Attallah, D. Nguyen-Manh, B. Cai
Summary: In this study, the mechanical and microstructural responses of a high-strength medium entropy FeCrNi alloy at different temperatures were investigated using in situ neutron diffraction testing. The results showed that lattice distortion and dislocations played a significant role in enhancing the mechanical properties of the alloy. This research provides insights into the design of new alloys with superior mechanical performance.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Bin Zhu, Nathanael Leung, Winfried Kockelmann, Saurabh Kabra, Andrew J. London, Michael Gorley, Mark J. Whiting, Yiqiang Wang, Tan Sui
Summary: This study investigates the distribution of residual stress in Eurofer97 steel welds before and after heat treatment. Neutron diffraction and neutron Bragg edge imaging techniques are used to analyze the residual stress and strain. The relationship between microstructure, material properties, and residual stress is also studied. The findings provide insight into predicting the structural integrity of critical components in fusion reactors.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Pankaj Kumar, Saurabh Kabra, Jacqueline M. Cole
Summary: This study utilized the ChemDataExtractor text-mining toolkit to automatically generate databases of yield strength and grain size values. The extracted data showed a precision of 83.0% for yield strength and 78.8% for grain size. The databases were further validated through experiments, and the results matched well with the literature, demonstrating the usefulness of these automatically-extracted datasets.
Article
Nanoscience & Nanotechnology
Lei Tang, Oxana Magdysyuk, Fuqing Jiang, Yiqiang Wang, Alexander Evans, Saurabh Kabra, Biao Cai
Summary: This study reveals the mechanical and microstructural responses of a 316L ASS at low temperatures using in situ neutron diffraction tensile tests. The results show a linear decrease in stacking fault energy with temperature, leading to a transition in deformation mechanism.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Composites
Ali Makhloufi, Djelloul Gueribiz, Frederic Jacquemin, Silvain Freour
Summary: A multiscale approach is proposed to study the moisture diffusion behavior in polymer/clay nanocomposites. The results show that the clay volume fraction has a significant effect on moisture diffusion, and the microstructure at nanoscale strongly influences the moisture diffusion behavior at microscale. The exfoliated structure is found to be the most critical for moisture diffusion in polymer/clay nanocomposites.
JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
(2023)
Article
Multidisciplinary Sciences
Dong Liu, Qin Yu, Saurabh Kabra, Ming Jiang, Paul Forna-Kreutzer, Ruopeng Zhang, Madelyn Payne, Flynn Walsh, Bernd Gludovatz, Mark Asta, Andrew M. Minor, Easo P. George, Robert O. Ritchie
Summary: This study found that CrCoNi alloy displays exceptional crack growth toughness at 20 Kelvin, with high crack-initiation fracture toughness values and crack growth toughness values. The crack-tip deformation structures at 20 K involve nucleation and restricted growth of stacking faults, fine nanotwins, and transformed epsilon martensite, with coherent interfaces.
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.
