Article
Metallurgy & Metallurgical Engineering
Zhou Li-bo, Shu Jing-guo, Sun Jin-shan, Chen Jian, He Jian-jun, Li Wei, Huang Wei-ying, Niu Yan, Yuan Tie-chui
Summary: In this study, biomedical Ti-13Nb-13Zr powder mixed with tantalum particles was fabricated using L-PBF, resulting in a microstructure with beta matrix and unmelted tantalum distributed along the molten pool boundaries. Increasing tantalum content reduced molten pool size and resulted in finer microstructure at the center and coarser microstructure at the boundaries of the melt pool. Columnar-to-equiaxed transitions occurred near unmelted tantalum, with low lattice mismatch induced by solid tantalum phase. Recrystallization texture was strengthened and fiber texture weakened with increasing tantalum content. The formation of refined martensite alpha ' grains during L-PBF led to higher compressive strengths compared to samples fabricated using traditional methods, setting an important reference for future biomedical alloy design via L-PBF process.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2021)
Article
Nanoscience & Nanotechnology
Hanxiang Zhou, Changhui Song, Yongqiang Yang, Changjun Han, Meng Wang, Yunmian Xiao, Zixin Liu
Summary: Magnetic field-assisted laser-based additive manufacturing is a feasible method for improving the fabrication and performance of metal parts. The effects of static and alternating magnetic field-assisted laser powder bed fusion on the mechanical properties and microstructure of stainless steel 316L were investigated. The results showed that the applied magnetic field can inhibit epitaxial growth, change crystallographic texture, and improve the strength and ductility of specimens.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Manufacturing
I Ferretto, D. Kim, N. M. Della Ventura, M. Shahverdi, W. Lee, C. Leinenbach
Summary: The iron-based Fe-17Mn-5Si-10Cr-4Ni shape memory alloy (SMA) manufactured by laser powder bed fusion (LPBF) exhibits high strength, elongation, and ductility after annealing, as well as pronounced shape memory effect (SME) and pseudo-elasticity (PE) exceeding those of conventionally fabricated alloys. The texture generated during the LPBF process significantly influences SME and PE, with improved strain recovery observed when the loading direction is parallel to the build direction.
ADDITIVE MANUFACTURING
(2021)
Article
Optics
Wenpeng Shao, Bei He, Changyue Qiu, Zhuo Li
Summary: This study investigates the effects of hatch spacing and laser remelting on the microstructure and growth texture of IN718 superalloy fabricated using laser powder bed fusion. The study finds that increasing hatch spacing influences the growth texture and dendrite morphology, while laser remelting selects preferentially oriented grains and improves heat input.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Xiaojun Shen, Fanbo Meng, Kwang Boon Lau, Pei Wang, Christopher H. T. Lee
Summary: In this study, a strong lambda-fiber texture was achieved in Fe-3.5wt%Si electrical steel using the LPBF process. The formation of amorphous precipitates in additively manufactured Fe-Si alloy was also reported for the first time.
MATERIALS CHARACTERIZATION
(2022)
Article
Engineering, Manufacturing
Kun Sun, Abd El-Moez A. Mohamed, Sheng Li, Minki Jeong, Jake Head, Moataz M. Attallah
Summary: This study aims to develop a low-cost dense magnetocaloric Ni-Mn-Sn Heusler alloy (HA) using laser powder bed fusion (LPBF) additive manufacturing. The highest density was achieved at laser energy densities of 18.52 J/mm(3), 53.33 J/mm(3), and 89.89 J/mm(3) with densities of 6.8 g/cm(3), 8.2 g/cm(3), and 8.3 g/cm(3), respectively. The samples exhibited the L2(1) phase and double magnetic transitions, martensitie-austenite transition (T-M) and curie temperature (T-C(A)), with high magnetic entropy change values at T-M and T-C(A).
ADDITIVE MANUFACTURING
(2023)
Article
Nanoscience & Nanotechnology
Jin'e Sun, Lei Gao, Qi Liu, Pei Wang, Xuanhui Qu, Baicheng Zhang
Summary: In this study, the Al-Mn-Mg-Sc-Zr alloys were 3D printed using laser powder bed fusion and subjected to different heat treatments. The heat treated alloys showed an increase in strength but a decrease in ductility. The secondary precipitates of Al6Mn and Al3Sc played a positive role in the strengthening of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Manufacturing
S. L. Lu, Z. J. Zhang, R. Liu, X. H. Zhou, X. G. Wang, B. N. Zhang, X. M. Zhao, J. Eckert, Z. F. Zhang
Summary: This study investigates the effects of post-heat treatments on the mechanical properties of laser powder bed fusion (L-PBF) additive manufactured Ti6Al4V components. It is found that the L-PBF hereditary basket-weave microstructure exhibits superior tensile properties.
ADDITIVE MANUFACTURING
(2022)
Article
Materials Science, Multidisciplinary
Zhenjiang Zhao, Li Wang, Decheng Kong, Pengfei Liu, Xing He, Xiaoqing Ni, Liang Zhang, Chaofang Dong
Summary: The crystallographic heterostructure of additive manufactured metals has complicated effects on mechanical properties due to the unique thermal history. The texture configuration and deformation behavior of powder bed fusion-laser beam (PBF-LB) 18Ni300 maraging steel after different building orientations (BOs) were investigated. The results showed that the yield strength and elongation of the materials were significantly affected by the building orientation.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Xiaojun Shen, Huang Sheng, Yaojie He, Konstantinos A. Liogas, Kwang Boon Lau, Pei Wang, Fanbo Meng, Kewei Chen, Ning Jia, Upadrasta Ramamurty, Christopher H. T. Lee
Summary: This study focuses on using laser powder bed fusion technique to manufacture a soft magnetic core and explores its application in electric machines. The results show that the additively manufactured alloy performs better than traditional soft magnetic composite materials in weak magnetic fields, but further optimization is needed for strong magnetic fields and high-frequency applications.
MATERIALS & DESIGN
(2023)
Article
Nanoscience & Nanotechnology
Jairo Alberto Munoz, Sergio Elizalde, Alexander Komissarov, Jose Maria Cabrera
Summary: Improving the mechanical properties and reducing the anisotropy of Al alloys obtained by additive manufacturing is a topic of growing interest. This study investigated the effect of heat treatments on a hypoeutectic AlSi11Cu alloy obtained by laser powder bed fusion. The results show that heat treatments at different temperatures did not significantly affect grain size and dislocation density, but led to the loss of interconnection in the Si-rich network. Heat treatments for 1 hour effectively reduced anisotropy and improved formability.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Merve Nur Dogu, Kemal Davut, Muhannad Ahmed Obeidi, Mustafa Alp Yalcin, Hengfeng Gu, Thaddeus Song En Low, Jon Ginn, Dermot Brabazon
Summary: The recrystallization and grain growth behavior of IN718 alloy manufactured by laser powder bed fusion were studied. The texture evolution of the samples under different temperatures and holding times was investigated, and it was found that the formation of recrystallization nuclei was related to high defect density regions, while the presence of non-coherent precipitates limited the growth of recrystallized grains.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Review
Engineering, Manufacturing
H. R. Kotadia, G. Gibbons, A. Das, P. D. Howes
Summary: Additive manufacturing of metallic alloys has gained significant interest in the past two decades, particularly in aerospace and automotive applications. However, the development of AM with Al-alloys has been slow, with current research focusing on AlSiMg-based alloys and AlMgSc alloys, facing challenges and obstacles.
ADDITIVE MANUFACTURING
(2021)
Article
Materials Science, Multidisciplinary
Wei Wang, Yubo Zhang, Congcong Yue, Xiangqing Kong, Zhigang Hao, Tongmin Wang, Tingju Li
Summary: Laser power and scan speed are crucial parameters in laser powder bed fusion, affecting defects and microstructures. By adjusting the parameter combination, the performance and microstructure of the samples can be improved.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Manufacturing
Dafan Du, Lu Wang, Anping Dong, Wentao Yan, Guoliang Zhu, Baode Sun
Summary: Laser powder bed fusion (LPBF) technology is widely used in the manufacturing of metallic parts, but the high porosity and rough texture of the fabricated parts have hindered its development. In this study, the use of a static magnetic field (SMF) during the fabrication process improved the density, grain size, and mechanical properties of Al-based and Ni-based alloys. Simulation results showed that the increased SMF intensity resulted in deeper depression zones and reduced lack-of-fusion defects. The tensile tests also demonstrated increased strength and elongation in the printed samples under the applied SMF.
INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE
(2022)
Article
Education & Educational Research
L. E. J. Thomas-Seale, Sanjeevan Kanagalingam, J. C. Kirkman-Brown, M. M. Attallah, D. M. Espino, D. E. T. Shepherd
Summary: This study examines the effect of two undergraduate DfAM teaching approaches and finds that students who participate in both design lecture and manufacturing laboratory show better results in technical marks and participant evaluation, highlighting the importance of PBL in DfAM.
INTERNATIONAL JOURNAL OF TECHNOLOGY AND DESIGN EDUCATION
(2023)
Review
Materials Science, Multidisciplinary
Jinxing Sun, Daorong Ye, Ji Zou, Xiaoteng Chen, Yue Wang, Jinsi Yuan, Haowen Liang, Hongqiao Qu, Jon Binner, Jiaming Bai
Summary: Additive manufacturing (AM) has facilitated the production of highly customized, geometrically complex and functionalized parts in ceramic matrix composites (CMCs), resulting in improved properties and functionality compared to single-phase ceramic components. This article provides a comprehensive review on the capabilities and limitations of various AM techniques for CMCs, with a focus on the reported properties and potentials of AM-manufactured ceramic matrix composites.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Wenxuan Wang, Wenhao Chi, Zhaoyong Zou, Pengchao Zhang, Kun Wang, Ji Zou, Hang Ping, Jingjing Xie, Weimin Wang, Zhengyi Fu
Summary: This study constructed a high-efficiency ternary photosystem by selectively decorating the {001} facets of 18-facet SrTiO3 with Au@CdS photosensitizers. The photocatalyst demonstrated superior activity in visible-light-driven photocatalytic hydrogen evolution, achieving a 166% improvement compared to randomly deposited Au@CdS. The work provides new insights into the development of green and high-efficiency photocatalytic systems based on rational nanostructure design.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Wanjun Li, Wei Ji, Qiqi Zhu, Bowen Fan, Ji Zou, Weimin Wang, Zhengyi Fu
Summary: The natural brittleness of sapphire limits its machinability, but connecting sapphire with metals provides a new method for preparing large-size components. In this study, sapphire and TC4 alloy were joined using spark plasma sintering with Al2O3-Ti fillers. The optimized joint showed strong bonding between the heterogeneous materials and exhibited a high shear strength of 121 MPa.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Xiaoqing Zhao, Ji Zou, Aiyang Wang, Weimin Wang, Zhengyi Fu
Summary: The thermal stability of SiC whiskers on the mechanical properties of composites is crucial. The introduction of a thin Ti3SiC2 coating on SiC whiskers significantly improves their thermal stability at 1600-1700 degrees Celsius.
JOURNAL OF THE AMERICAN 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
Engineering, Electrical & Electronic
Rashad H. H. Mahmud, Raad S. S. Jarjees, Yang Yu, Ekasit Nugoolcharoenlap, Talal Skaik, Moataz M. M. Attallah, Yi Wang
Summary: This letter presents the design of a third-order filtering waveguide aperture antenna that utilizes coupled cavity resonators. The design incorporates three offset-coupled rectangular waveguide cavities to achieve two nested loaded-stubs without requiring additional structure and size. The loaded-stubs introduce controlled transmission zeroes and improve out-of-band realized gain selectivity. A prototype operating in the X-band frequencies was fabricated using selective laser melting printing technique, and the measured results matched well with the simulated results, demonstrating a flat gain response of 7.0 +/- 0.2 dBi from 9.5 to 10.5 GHz with excellent out-of-band selectivity. The proposed design offers stronger out-of-band gain selectivity and a low profile compared to previously designed filtering antennas.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Review
Automation & Control Systems
Weining Li, Moataz M. Attallah, Khamis Essa
Summary: Single-point incremental forming (SPIF) is a sheet forming technique that gradually deforms sheet materials to a designated shape. It has shown high capability to deform low-strength materials accurately at room temperature. However, deforming high-temperature alloys requires integrated heating sources, which can lead to unpredictable thermal behaviors and affect formability and surface quality. The current challenge is improving localized and stable heating, tool design to reduce thermal expansion and friction, and analyzing the relationship between thermal and mechanical effects.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Physics, Applied
Marco Menchetti, Liam W. Bussey, Daniel Gilks, Tim Whitley, Costas Constantinou, Kai Bongs
Summary: We demonstrate a passive RF to optical data transfer technique using an atomic Rydberg receiver without a local oscillator. The technique allows us to detect and decode digital data from a 5G carrier wave (3.5 GHz) without the need for a local oscillator to detect signal modulation. Data encoding and decoding are achieved using an intermediate frequency, and detection is performed by converting the intermediate frequency into the optical domain using rubidium vapor. Data rates up to 238 kbps are achieved using this technique with various encoding schemes.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Jithin Kannanthara, Darren Griffiths, Mohammed Jahangir, Jonathan M. Jones, Chris J. Baker, Michail Antoniou, Colin J. Bell, Henry White, Kai Bongs, Yeshpal Singh
Summary: To meet the demands of radar applications, this article presents a practical method of modeling and simulating radar systems based on user requirements. It discusses the high-fidelity simulation of each building block in the radar model and validates the model by comparing it with real radar trial results. The article also briefly discusses the impact of radar oscillator phase noise in the range-Doppler plot.
IET RADAR SONAR AND NAVIGATION
(2023)
Article
Engineering, Mechanical
Yifan Li, Moataz M. Attallah, Harry Coules, Rafael Martinez, Martyn Pavier
Summary: The octet-truss lattice is a three-dimensional lattice with high strength and low density. Lattice specimens with different orientations were prepared to investigate the orientation effects on lattice fatigue behaviour. X-ray tomography was used to measure the surface roughness of the lattice struts and validate the accuracy of crack length measurement. The experimental results showed that fatigue crack growth rate and path depend on the lattice orientation. Finite element predictions of fatigue life were in agreement with experimental results and a procedure for predicting crack growth path was proposed. These findings can aid in optimizing the orientation of lattice structures in structural applications.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Chemistry, Physical
Fuqing Jiang, Lei Tang, Sheng Li, Hengqiang Ye, Moataz M. Attallah, Zhiqing Yang
Summary: A crack-free, strong and ductile Al-Cu-Mg-Ag alloy with TiB2 particles was successfully fabricated using laser powder bed fusion (L-PBF). The microstructure of the alloy was modified and strengthened through subsequent solution and aging. TiB2 particles were found to reduce metallurgical defects and enhance mechanical performance by forming Al3Ti compounds and refining grains. The as-built alloy exhibited excellent combination of strength and ductility, and the heat treatment further improved its yield strength and ultimate tensile strength, while slightly decreasing the elongation to failure. The strengthening mechanisms and plastic instability phenomenon of the alloy were analyzed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Kun Sun, Sheng Li, Abd El-Moez A. Mohamed, Kan Ma, Ranxi Duan, Oliver Peter Brooks, Minki Jeong, Jake Head, Richard S. Sheridan, Moataz M. Attallah
Summary: This study investigates the effects of heat treatment time on the micro-structure and magnetocaloric effect of laser powder bed fusion NiMnSn alloys. Increasing the heat treatment time improves chemical homogeneity and decreases local misorientation. This is associated with an enhancement in the maximum magnetic entropy change values around the martensitic transformation temperature.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Multidisciplinary Sciences
Jamie Vovrosh, Katie Wilkinson, Sam Hedges, Kieran McGovern, Farzad Hayati, Christopher Carson, Adam Selyem, Jonathan Winch, Ben Stray, Luuk Earl, Maxwell Hamerow, Georgia Wilson, Adam Seedat, Sanaz Roshanmanesh, Kai Bongs, Michael Holynski
Summary: Borehole gravity sensing has various applications and can measure features around wells, such as rock-type changes and reservoir porosity. Quantum technology gravity sensors based on atom interferometry offer faster survey speeds and reduced need for calibration. However, improvements are needed in terms of robustness and reducing size, weight, and power consumption to deploy these devices in boreholes.
Article
Engineering, Electrical & Electronic
Lu Qian, Rafael Martinez, Milan Salek, Talal Skaik, Moataz Attallah, Yi Wang
Summary: This paper demonstrates the design concept of a pole-generating resonant iris in rectangular waveguide filters. Unlike conventional reactive iris, the resonant iris can generate an additional transmission pole without increasing the number of resonant cavities. This leads to several design advantages: a more compact filter structure, the ability to achieve strong coupling and wide bandwidth, and a new polarization rotation capability. Experimental results confirm the feasibility of the design concept and the additive manufacturing technique in microwave waveguide devices.
IEEE JOURNAL OF MICROWAVES
(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.
