Article
Materials Science, Multidisciplinary
Kai Wang, Guillaume Boussinot, Efim A. Brener, Robert Spatschek
Summary: This study presents a three-phase field model for simulating eutectic and eutectoid transformations, overcoming limitations of existing models in meeting local equilibrium boundary conditions with finite diffusion contrasts. The necessity of kinetic cross coupling for quantitative phase field simulations is verified through benchmark testing and experimentation. The relevance of the theory developed by Ankit et al. in describing the two limiting diffusion regimes is validated through simulations in both one-sided and two-sided cases.
Review
Engineering, Biomedical
Weijie Weng, Arne Biesiekierski, Yuncang Li, Matthew Dargusch, Cuie Wen
Summary: The study focuses on the biological impact and application of rare-earth elements (REEs) in biodegradable Mg-based biomaterials. Despite the effectiveness of REEs in improving corrosion, mechanical, and manufacturability properties of Mg alloys, their physiological effects are still poorly understood. The review provides guidance for the development of new biomedical alloys and emphasizes areas of concern and unclear knowledge. Key findings include current clinical and preclinical work summary, highlighting Sc as the most promising REE in terms of physiological impact, while caution is advised when considering other REEs as alloying elements.
ACTA BIOMATERIALIA
(2021)
Article
Metallurgy & Metallurgical Engineering
Hiba Azzeddine, Abdelkader Hanna, Achour Dakhouche, Berengere Luthringer-Feyerabend
Summary: The corrosion behavior of as-cast binary Mg-0.3Ce, Mg-1.44Nd, Mg-0.63Gd and Mg-0.41Dy alloys was investigated in DMEM+ 10% FBS solution using electrochemical and weight loss tests. Alloys with heavy RE elements (Gd and Dy) exhibited the lowest corrosion rate compared to those with light RE elements (Ce and Nd). The cytocompatibility of the Mg-RE alloys was assessed, with Mg-0.63Gd alloy identified as a suitable candidate for biomedical applications.
JOURNAL OF MAGNESIUM AND ALLOYS
(2021)
Article
Nanoscience & Nanotechnology
X. Wang, W. Zhai, J. Y. Wang, B. Wei
Summary: The solidification process of high-entropy FeCoNi2Al0.9 alloy was modulated using 20 kHz power ultrasound with a maximum amplitude of 13 μm. The eutectic structures were composed of L12 and B2 phases growing synergistically by the K-S relationship. Increasing the ultrasound amplitude resulted in refined eutectic cell width and regular lamellar spacing, increased proportion of strictly semi-coherent L12/B2 interfaces, and suppressed solute concentration fluctuation in each eutectic phase. The steady-state cavitation and acoustic flow had a significant influence on the evolution of the eutectic microstructure. The alloy exhibited increased yield strength, ultimate strength, and total elongation compared to statically solidified alloy, providing an effective approach to improve the mechanical properties and overcome the strength-ductility trade-off in high-entropy alloys with eutectic structures.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Tianxu Zheng, Yaobo Hu, Chao Zhang, Tianshuo Zhao, Bin Jiang, Fusheng Pan, Aitao Tang
Summary: The aim of this study was to elucidate the underlying mechanism involved in the formation of rare earth texture and pseudo fiber bimodal microstructure in a high ductility Mg-2Gd-0.4Zr alloy. The research found that the rare earth texture emerged during the dynamic recrystallization process and was further strengthened during subsequent static recrystallization and grain growth processes. The delayed nucleation and growth of grains in the streamline region of Zr particles led to the formation of a pseudo fiber bimodal microstructure in the extruded Mg-2Gd-0.4Zr alloy.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2024)
Review
Metallurgy & Metallurgical Engineering
Guohua Wu, Cunlong Wang, Ming Sun, Wenjiang Ding
Summary: This paper reviews the progress and developments of high-performance Mg-RE alloys in recent years, focusing on cast alloys. The main topics covered include alloy design, melt purification, grain refinement, castability, novel casting methods, and industrial applications. The review offers insights for future developments in new alloys, techniques, and applications of Mg alloys.
JOURNAL OF MAGNESIUM AND ALLOYS
(2021)
Article
Nanoscience & Nanotechnology
Junlei Zhang, Shengjie Han, Yuhong Sun, Xiang Chen, Peng Chen, Zulai Li, Guangsheng Huang, Fusheng Pan
Summary: In this study, three types of WE43 plates with different heat treatments were studied. The microstructure and mechanical properties of these plates were investigated. It was found that the number of precipitates increased as a result of aging after extrusion. The coarse grains and high Schmid factor led to the highest hardness and limited plasticity in the solution-aging after extrusion plates. The T5 plates showed the highest strength due to fine grains and multiple precipitates, while the T6 plates exhibited low ductility because of grain boundary and twin boundary cracking.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Biotechnology & Applied Microbiology
Sheng Nie, Jiakai Chen, Chen Liu, Chenhui Zhou, Jikuang Zhao, Zhepei Wang, Jie Sun, Yi Huang
Summary: This study evaluated the effects of rare earth element (REE)-supplemented magnesium alloys (Mg-alloys) on cell proliferation and specific cell functions. The results showed that moderate amounts of REEs in Mg-alloys can promote osteoblastic activity and vascularization, providing valuable insights for improving the bioactivity of Mg-alloys in clinical applications. Further research and optimization of alloy compositions are needed to enhance biocompatibility and performance of Mg-alloys.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Yixuan He, Yuhao Wu, Fan Bu, Chengxiong Zou, Zhangchi Bian, Qiliang Huang, Tie Liu, Qiang Wang, Jun Wang, Jinshan Li, Eric Beaugnon
Summary: The study examines the structure evolution of Co-B alloys under a 25 T magnetic field, revealing effects on solidification and phase transformation behaviors. The magnetic field influences heterogeneous nucleation and can effectively suppress phase decomposition during cooling, potentially offering insights for field-manipulation of magnetic materials.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Ang Zhang, Zhipeng Guo, Bin Jiang, Jinglian Du, Cuihong Wang, Guangsheng Huang, Dingfei Zhang, Feng Liu, Shoumei Xiong, Fusheng Pan
Summary: This study developed a solid-liquid-gas multiphase field lattice Boltzmann model to describe the complex interaction during solidification. The model was successfully validated and compared to other models, effectively describing the interaction between gas porosity and magnesium dendrite. It is suitable for exploring multiphase equilibrium and addressing problems involving solid-liquid-gas multiphase and multiphysical characteristics.
Article
Materials Science, Multidisciplinary
Anna Soper, Adam L. Shaw, Patrick L. J. Conway, Gregory S. Pomrehn, Michael Ferry, Lori Bassman, Aurora Pribram-Jones, Kevin J. Laws
Summary: In this study, a computationally efficient method is proposed to stabilize the lightweight and strong Mg-Sc bcc phase by adding rare earth elements. Experimental validation shows that the bcc phase is stabilized by the addition of Y or Er, but not by La, Ce, or Nd. This study suggests a method to predict the integration of ternary elements into binary systems.
COMPUTATIONAL MATERIALS SCIENCE
(2022)
Review
Metallurgy & Metallurgical Engineering
Amjad Javaid, Frank Czerwinski
Summary: This report discusses global efforts in expanding manufacturing capabilities of magnesium sheet through twin roll casting path, emphasizing on the application of this technology in magnesium materials and potential directions for development. Special attention is paid to the research progress in magnesium twin roll casting at CanmetMATERIALS in Canada.
JOURNAL OF MAGNESIUM AND ALLOYS
(2021)
Article
Materials Science, Multidisciplinary
Song Li, Zhaohui Jin, Xiaoguo Gong, Hua Huang, Shaokang Guan, Guangyin Yuan
Summary: Mg-Sc alloys with less than 25 atomic percent Sc exhibit shape memory effects, and the martensitic transformation temperature can be elevated by tuning the chemical ordering and microstructure of Mg-Sc precipitates. Increased ground-state energy difference and decreased vibra-tional free energy difference between austenite and martensite contribute mainly to the stabilized phase transformations.
Article
Materials Science, Multidisciplinary
Yanfei Chen, Zhengqiang Zhu, Jixue Zhou, Fei Zhao
Summary: In this study, Ce-containing Mg alloy sheets were successfully joined using fiber laser welding. The microstructure of the joint revealed that the heat-affected zone (HAZ) experienced softening, while the fusion zone (FZ) exhibited enhanced strength. The intermetallic compounds in the HAZ underwent a transformation into coral-like structures, while those containing rare-earth (RE) elements remained almost unchanged.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
Lei Wang, Dong -Rong Liu, Tian Chen, Shaofan Wang, Yang Cao
Summary: Adding low-cost aluminum element to Mg-RE alloy can significantly refine the grain structure in the laser surface remelting process and improve the thermal stability by forming nanoscale intermetallic compounds.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Guangli Bi, Siqi Chen, Jing Jiang, Yuandong Li, Tijun Chen, Xiao-Bo Chen, Duyao Zhang, Dong Qiu, Mark Easton
Summary: The effects of laser surface remelting (LSR) on microstructure and corrosion properties of as-cast Mg-12Dy-1.1Ni alloy were investigated. LSR treatment resulted in grain refinement and the formation of a continuous network of 18R-LPSO phase on dendrite boundaries, leading to improved corrosion resistance of the alloy.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Engineering, Manufacturing
Christian Hagenlocher, Patrick O'Toole, Wei Xu, Milan Brandt, Mark Easton, Andrey Molotnikov
Summary: The accumulation of heat during additive manufacturing processes can result in shape deviations and inhomogeneous properties of the parts. This research provides an analytical description of the heat accumulation effect and proposes optimization strategies to reduce heat accumulation and increase productivity.
ADDITIVE MANUFACTURING
(2022)
Article
Materials Science, Multidisciplinary
Huan Liu, Hai Wang, Ling Ren, Dong Qiu, Ke Yang
Summary: A new biomedical titanium-copper alloy was produced by adding copper element in pure titanium using laser powder bed fusion (LPBF). The addition of copper eliminates the strength-ductility mismatch caused by the usual microstructure of near alpha titanium alloy fabricated by LPBF. A boundary engineering strategy aiming to enhance the strength and ductility of the martensitic titanium alloy fabricated by LPBF was proposed. The Ti-5Cu alloy exhibits high tensile strength and excellent elongation, making it a promising titanium alloy for potential applications.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Guofang Liang, Yingang Liu, Xianliang Yang, Andrej Atrens, Tao Wu, Zhiqiang Tian, Qiyang Tan, Yu Yin, Jianjun Wang, Ming-Xing Zhang
Summary: The edge-to-edge matching model was used to identify TiB2 as a potential grain refiner for high temperature delta-ferrite in low carbon steels. By adding TiB2 particles using Al-5Ti-B master alloy into A517 steel, significant grain refinement was achieved after reheating and air cooling. The grain refinement was attributed to Ti-containing nanometre-sized precipitates along prior austenite grain boundaries inhibiting the grain growth.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Feng Li, Zhicheng Li, Chenglu Tang, Lijun Zhang, Qiyang Tan, Chao Chen, MingXing Zhang, Kechao Zhou
Summary: Considerable research has been done on laser powder bed fusion (LPBF) to address the high crack susceptibility of aluminum alloys. This study presents a novel component with superior processability, refined microstructure, and high strength, achieved through composition adjustment. By adding 4.4 wt% Mg and 3.1 wt% Si, a relative density of 99.6% and crack elimination were achieved. The fabricated alloy exhibited granular Mg2Si and rod-shaped Si phases, and had an ultimate tensile strength of 460 MPa, yield strength of 385 MPa, and elongation of 3.2%. The study provides guidance for defects suppression and composition design in additively manufactured high-strength Al-Mg-Si alloys and other aluminum alloys.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Automation & Control Systems
Michael J. Benoit, Joel Galos, Kevin Heieis, Suming Zhu, Tom Wood, Paul G. Sanders, Elizabeth T. Hetrick, Bita Ghaffari, Adrian P. Mouritz, Mark A. Easton
Summary: One challenge in using X-ray imaging for post-process inspection of fusion welding is the lack of contrast between the fusion zone and base metal. This study develops novel filler wires with Ce additions to create grayscale contrast for X-ray imaging. The addition of Ce-containing precipitate particles enhances the contrast and enables superior quantitative inspection. This method effectively measures weld penetration by X-ray imaging.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Engineering, Manufacturing
Xin Tong, Guohua Wu, Mark A. Easton, Ming Sun, Qiman Wang, Liang Zhang
Summary: This work reports the highest yield strength and elongation in an Mg-Y-RE-Zr alloy produced by an additive manufacturing (AM) process. A combination of a large-diameter welding wire and pulsed current was used to inhibit the oxidation of WE43 alloy fabricated by quasi-directed energy deposition using electric arc (quasi-DED-Arc). The results show that the amount of Y2O3 in this work is only 2-5% of that of the sample produced by powder bed fusion (PBF) reported previously. Moreover, the variable solidification conditions and in-situ heat treatments induced by the multiple thermal cycles (MTCs) were found to result in an inhomogeneous microstructure along the building direction, which are responsible for the variations in mechanical properties. The WE43 alloy exhibits excellent mechanical properties due to the intrinsic heat treatment that occurs during the build process. The 8th layer exhibits a maximum tensile strength of 347 MPa and a good elongation of 7.1%, which exceeds the strength-ductility combinations for cast WE43 alloy. The strengthening mechanisms in different layers have been discussed. A physical model depicting the microstructural transformation during quasi-DED-Arc has been proposed based on the measured thermal cycling data and microstructure observations.
ADDITIVE MANUFACTURING
(2023)
Article
Engineering, Mechanical
Hai Wang, Konrad Koenigsmann, Shuyuan Zhang, Yi Li, Huan Liu, Hui Liu, Ling Ren, Dong Qiu, Ke Yang
Summary: Superplasticity at low temperatures and high strain rates has been achieved in a Ti6Al4V5Cu model alloy using a multiphase nanocrystalline network (MPNN). The onset temperature for superplasticity in this alloy is 250°C lower than that of Ti6Al4V alloy, and it exhibits superplasticity even at extremely high strain rates. This research is significant for the development of more economical and efficient superplastic deformation processes.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Materials Science, Multidisciplinary
David T. Rees, Chu Lun Alex Leung, Joe Elambasseril, Sebastian Marussi, Saurabh Shah, Shashidhara Marathe, Milan Brandt, Mark Easton, Peter D. Lee
Summary: In this study, two approaches, including TiB2 additions and optimization of LPBF process parameters, were used to suppress the formation of hot cracks in laser powder bed fusion (LPBF) additive manufacturing of 2XXX series Al alloys. High-speed synchrotron X-ray radiography and high-resolution synchrotron X-ray computed tomography (sCT) were used to monitor the LPBF process and measure the volume fraction of defects in the as-built samples. The results showed that adding TiB2 in Al-2139 reduced the volume of cracks by up to 79% and decreased the average length, breadth, and surface area of cracks.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
M. J. Benoit, M. A. Whitney, S. M. Zhu, D. Zhang, M. R. Field, M. A. Easton
Summary: This article investigates the effect of minor Fe additions on crack elimination in rapidly solidified Al alloy 6060 and provides insights into the underlying mechanism. The results show a decrease in cracking with increasing Fe content, and complete elimination of cracks in the 6060 + 0.5Fe sample. Microscopic analysis reveals the morphological changes of AlFeSi particles in the melt pools, and suggests that bridging of the Al matrix by these particles plays a crucial role in crack mitigation.
MATERIALS CHARACTERIZATION
(2023)
Article
Nanoscience & Nanotechnology
Suming Zhu, Indrajeet Katti, Dong Qiu, Joy H. Forsmark, Mark A. Easton
Summary: This study investigates the microstructure of PBF-LB AlSi10Mg and the effects of platform preheating and heat treatment on its mechanical properties. Preheating to 150°C improves strength, and T5 treatment further increases yield strength and tensile strength but reduces ductility. RST-T6 treatment enhances ductility while maintaining yield strength but decreases tensile strength.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Jiaqi Li, Duyao Zhang, Xiaobo Chen, Dake Xu, Dong Qiu, Fuhui Wang, Mark Easton
Summary: This paper investigates the effect of copper concentration on the microbiologically influenced corrosion (MIC) resistance of additively manufactured, ultrafine-grained Ti-Cu alloys. The results show that Ti-8.5Cu alloy exhibits the best corrosion resistance and MIC resistance due to its strong passive film and small surface potential difference between phases. The alloy has high strength and excellent antimicrobial properties, making it ideal for load-bearing applications in the marine environment.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Characterization & Testing
Papangkorn Jessadatavornwong, Ruwan Tennakoon, Alireza Bab-Hadiashar, Raj Das, Adrian P. Mouritz, Mark A. Easton
Summary: One challenge of using X-ray computed tomography (CT) is the detection limit of the smallest feature. This challenge can be addressed by generating defined size notches on the surface and investigating different X-ray CT parameters. The results show that the voxel size and scan duration are significant factors for defect detection and measurement accuracy.
NDT & E INTERNATIONAL
(2023)
Article
Nanoscience & Nanotechnology
S. L. Lu, D. Han, D. Y. Qin, T. Song, D. Qiu, M. Brandt, H. P. Tang, M. Qian
Summary: Massive transformations occur in titanium alloys, resulting in patch-like massive phases that traverse the parent prior-beta grain boundaries. The formation of these phases always occurs when two neighboring prior-beta grains share or nearly share a {110} pole. These phases display concentrated {0001} poles and tend to decompose into ultrafine alpha-beta lamellae.
SCRIPTA MATERIALIA
(2024)
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.
