Article
Materials Science, Multidisciplinary
N. Li, C. Wang, M. A. Monclus, L. Yang, J. M. Molina-Aldareguia
Summary: A new high-throughput methodology is proposed to directly measure the alloying effects on the critical resolved shear stress of different deformation modes in Mg alloys. The study found that the strengthening effect of MgZn2 precipitates on basal slip and extension twinning is significantly larger than the effect of Zn in solid solution, while the strengthening of pyramidal slip is similar in both cases.
Article
Nanoscience & Nanotechnology
Reza Alizadeh, Jingya Wang, Javier LLorca
Summary: The mechanical properties of Mg-4wt.% Zn alloy single crystals were investigated through micropillar compression testing, revealing that pyramidal slip in precipitation hardened alloy leads to homogeneous deformation and strong hardening. The presence of rod-shape precipitates perpendicular to the basal plane significantly reduces the plastic anisotropy of Mg.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Jianghuai Yuan, Shenghao Zhou, Haichen Wu, Zhenyu Wang, Yan Zhang, Guangxue Zhou, Guanshui Ma, Peiling Ke, Aiying Wang
Summary: Nanocrystalline Cr2AlC coating exhibits high-purity and ultrahigh compressive strength, with excellent ductility at room temperature, which is attributed to the effect of the nano-crystalline structure.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Tianxu Zheng, Yaobo Hu, Bin Jiang, Liang Fu, Fusheng Pan, Aitao Tang
Summary: This study investigates the impact of Gd elements on the enhancement of ductility in the Mg-Gd-Zr alloy. It was found that Gd elements can reduce the critical resolved shear stress (CRSS) ratio between non-basal slip and basal slip, facilitating the initiation of more non-basal slip systems to accommodate strain. Furthermore, the segregation of Gd elements at grain boundaries was observed to enhance the grain boundary strength of the alloy, which is a significant factor in the enhancement of ductility.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
Ming-ya Zhang, Yu-qin Zhang, Hui Yu, Hong-xia Wang, Xiao-feng Niu, Li-fei Wang, Hang Li, Wei-li Cheng
Summary: This paper investigates the deformation behavior of a dilute Mg alloy during hot compression and finds that the activation of twinning and dynamic recrystallization is influenced by the strain rates. The study also reveals that the crystal orientation is altered by the activation of twinning and DRX processes, playing a significant role in the plastic deformation behavior of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Jingya Wang, Yiwen Chen, Zhe Chen, Javier Llorca, Xiaoqin Zeng
Summary: The effect of Ca and Zn in solid solution on the critical resolved shear stress (CRSS) of different slip systems in Mg alloys was investigated, revealing changes in plastic anisotropy and twin growth. The results showed that the addition of solute atoms increased the CRSS for basal slip and decreased the CRSS for pyramidal slip, leading to improved ductility and formability in the Mg-Ca-Zn alloys.
Article
Metallurgy & Metallurgical Engineering
B. J. Wang, D. K. Xu, X. Q. Zhuang, L. Y. Sheng
Summary: The tensile behaviors of Mg-8%Li and Mg-8%Li-6%Zn-1.2%Y alloys were compared. The plastic instability of Mg-8%Li alloy was significant, while the addition of I-phase (Mg3Zn6Y) in Mg-8%Li-6%Zn-1.2%Y alloy enhanced tensile strength and eliminated plastic instability, but reduced ductility.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Nanoscience & Nanotechnology
Biaobiao Yang, Jun Wang, Yunping Li, Matthew Barnett, Javier LLorca
Summary: The transformation from compression twins (CT) to double twins (DT) was studied in a dual-textured Mg-6.5%Zn(wt.) alloy during deformation along the extrusion axis. After 7.3% compression, 85% of CT transformed to DT. However, during tension, the transformation ratio dropped to 22% and 36% despite higher applied stresses and strains. The differences in DT activity could not be explained by the Schmid factor, indicating that the activation of non-basal slip plays a role in suppressing the CT to DT transformation.
SCRIPTA MATERIALIA
(2023)
Article
Engineering, Mechanical
An Luo, Yunlai Deng, Liqun Guan, Xiaobin Guo
Summary: The study revealed that the geometric compatibility of grains and stress component on basal slip planes determine the propagation path of cracks. Twins and textures are found to be unfavorable for crack propagation, increasing the difficulty of propagation and improving fatigue resistance at higher stress levels.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Materials Science, Multidisciplinary
Manfa Yuan, Jin Zhang, Yunlai Deng, Xiaobin Guo, Liqun Guan
Summary: A noteworthy ductility Mg-8Gd-4Y-1Nd-0.5Si alloy with a strong non-basal texture was developed by combining multi-directional forging and extrusion techniques. Slip trace analysis revealed that multiple slip modes inside the crystal contributed to an improved elongation of the alloy.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Surajit Samanta, Jyoti Ranjan Sahoo, Sumeet Mishra
Summary: A new modeling framework is proposed to analyze the flow behavior of Al-Mg alloys by considering both the direct and indirect effects of solutes on flow stress. The direct effect refers to the increased slip resistance due to dynamic strain aging, while the indirect effect represents the role of solutes in cross-slip probability. The proposed framework, which modifies the dislocation density evolution equation, shows better performance in predicting flow curves compared to existing models. Experimental validation is conducted through various techniques such as X-ray line profile analysis and transmission electron microscopy.
Article
Materials Science, Multidisciplinary
Miguel Pena, Andres Morell-Pacheco, Ching-Heng Shiau, Boopathy Kombaiah, Lingfeng He, Laura Hawkins, Adam Gabriel, Frank A. Garner, Lin Shao
Summary: In situ micropillar compression was used to investigate the deformation behavior of proton-irradiated Hastelloy-N at various damage levels. The study revealed complicated defect structures and determined the relationship between critical resolved shear stress and hardening exponent with displacements per atom values. The highest damage level resulted in a 60% increase in critical resolved shear stress.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Metallurgy & Metallurgical Engineering
X. Z. Jin, W. C. Xua, D. B. Shana, B. Guoa, B. Jin, M. T. Perez-Pradob
Summary: This study combines experimental micromechanical methods and analytical electron microscopy to analyze the influence of nanoprecipitation on soft and hard basal slip and twinning in a weakly textured, polycrystalline Mg-Gd-Y-Zr alloy. The results show that aging leads to extreme localization in grains favorably oriented for soft basal slip, while prismatic slip dominates deformation and twinning is favored in grains with the c-axis perpendicular to the compression axis. In grains deforming mainly by hard basal slip, precipitation leads to the strengthening of basal systems without obvious localization.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Metallurgy & Metallurgical Engineering
Ji Hyun Hwang, A. Zargaran, Gyeongbae Park, O. Lee, B-J Lee, Nack J. Kim
Summary: The deformation behavior of a magnesium alloy containing 1% aluminum has been investigated in this study. The alloy shows much higher strength and larger elongation compared to pure magnesium with similar texture and grain size. Non-basal slips are easily activated in the Mg-1Al alloy at an early stage of deformation, leading to strain localization along the initially formed slip lines with increasing tensile strain.
JOURNAL OF MAGNESIUM AND ALLOYS
(2021)
Article
Materials Science, Multidisciplinary
Igor J. S. Cherubin, Matthew Topping, Fei Long, Mark R. Daymond
Summary: The deformation characteristics of 8-zirconium hydrides grown on a Zr2.5Nb alloy were investigated through micro compression tests. Plastic deformation was observed based on the stress-strain curves obtained from the compression tests. Transmission electron microscopy revealed the presence of dislocations consistent with the common { 111 } < 110 > FCC slip system using focused-ion beam cross-section analysis of the deformed 8-zirconium hydride micropillar.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Junfeng Cui, Liang Ma, Guoxin Chen, Nan Jiang, Peiling Ke, Yingying Yang, Shiliang Wang, Kazuhito Nishimura, Javier Llorca
Summary: This article reports the abnormal phenomenon that twin boundaries weaken the strength of body-centered cubic (BCC) tungsten. [1-11]-oriented W nanowires with (121) twin planes and free of dislocations were fabricated, and in situ tensile tests were performed. The fracture strength of the twinned W nanowire was found to be 13.7 GPa, 16% lower than that of the single-crystal W nanowire (16.3 GPa). The weakening mechanism was revealed to be the early nucleation of a crack at the intersection of the twin boundary with the surface.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Maral Sarebanzadeh, Alberto Orozco-Caballero, Javier LLorca
Summary: The transfer of basal-to-basal slip across grain boundaries was studied in weakly-textured pure Mg specimens deformed in tension using slip trace analysis and electron back-scatterer diffraction. Basal slip was the dominant deformation mechanism in most grains, and the transfer/blocking of slip at grain boundaries was examined. The active slip system(s) in the grains were determined by analyzing the rotation of grains caused by plastic slip along the basal slip systems. Additionally, the orientation of grain boundaries was measured to determine the twist angle theta.
Article
Chemistry, Physical
Cristina Madrona, Seungki Hong, Dongju Lee, Julia Garcia-Perez, Jose Manuel Guevara-Vela, Ramon Bernardo Gavito, Anastasiia Mikhalchan, Javier Llorca, Bon-Cheol Ku, Daniel Granados, Jun Yeon Hwang, Juan J. Vilatela
Summary: This work describes macroscopic fibers composed of aligned double-walled carbon nanotubes (DWCNTs) intercalated with bromine. The intercalated structure consists of bromine ions lying inside the interstitial sites between the DWCNTs, forming ordered supramolecular wires. The intercalation greatly increases the electrical conductivity and retains the exceptional mechanical properties of the CNT fiber host.
Article
Materials Science, Multidisciplinary
Wei Shao, Sha Liu, Javier LLorca
Summary: The whole Al-Li phase diagram is accurately predicted from first principles calculations and statistical mechanics, taking into account the effect of configurational and vibrational entropy. The predicted phase diagram shows excellent agreement with the experimental results in terms of stable and metastable phases, phase boundaries, and maximum stability temperature of line compounds. The methodology demonstrates that accurate phase diagrams of technologically important alloys can be obtained from first principles calculations.
COMPUTATIONAL MATERIALS SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Jiawei Lu, Ryan Khawarizmi, Miguel Monclus, Jon Molina-Aldareguia, Patrick Kwon, Thomas R. Bieler
Summary: The hardness and orientations of the primary αp and transformed βt grains in segmented chips obtained by turning Ti-6Al-4V bar were analyzed. The hardness of αp grains highly depends on the crystal orientation, varying from 4.5 GPa to 6.7 GPa. In the machined chips, αp grains showed similar hardness values while βt grains became slightly harder. The width of shear bands in the chips varied and smaller shear strain was correlated with larger shear cracks.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
A. Sierra-Soraluce, G. Li, M. J. Santofimia, J. M. Molina-Aldareguia, A. Smith, M. Muratori, I. Sabirov
Summary: This article investigates the effect of chemistry and heat treatment parameters on the microstructure and properties of Q&P treated martensitic stainless steels. It is demonstrated that these steels show a good combination of enhanced strength and sufficient tensile ductility, with the ability of the martensitic matrix to accumulate plastic deformation playing an important role. The relationship between the Q&P process, microstructure, and properties is discussed.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Biaobiao Yang, Jun Wang, Yunping Li, Matthew Barnett, Javier LLorca
Summary: A dual-textured Mg-6.5 Zn alloy with limited yield asymmetry is studied. The deformation mechanisms responsible for the behavior are analyzed and it is found that compressive deformation is accommodated by basal slip and extension twinning, while tensile deformation promotes basal and nonbasal slip. The contribution of rotated grains leads to similar values of the yield strength in tension and compression.
Article
Engineering, Manufacturing
Mario Rueda-Ruiz, Miguel Herraez, Federico Sket, Francisco Galvez, Carlos Gonzalez, Jon M. Molina-Aldareguia
Summary: The use of composite materials for impact-resistant structures requires understanding the dynamic behavior of the material. A physically-based computational micromechanics simulation tool has been developed to predict failure initiation in a composite ply under different strain rates. The simulation tool incorporates constitutive models calibrated with novel micromechanical testing techniques. By comparing simulation and experimental results, a change in failure initiation mechanism of the composite ply with strain rate has been identified and confirmed through observations of fracture surfaces.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Engineering, Mechanical
Mingdi Yu, Yuchi Cui, Jingya Wang, Yiwen Chen, Zhigang Ding, Tao Ying, Javier Llorca, Xiaoqin Zeng
Summary: The presence of Y and Ca in a magnesium-based alloy led to a significant increase in the critical resolved shear stress (CRSS) for different deformation mechanisms, including basal slip, pyramidal slip, and tensile twin nucleation. This change in CRSS altered the dominant deformation mechanisms in polycrystals, replacing tensile twinning with prismatic slip during compressive deformation. The reduction of twinning and the activation of prismatic slip were responsible for the high tensile ductility of the alloy.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Materials Science, Biomaterials
Wahaaj Ali, Monica Echeverry-Rendon, Guillermo Dominguez, Kerstin van Gaalen, Alexander Kopp, Carlos Gonzalez, Javier LLorca
Summary: This study analyzed the corrosion, mechanical degradation, and biological performance of cold-drawn WE43 Mg wires. The results showed that the surface-modified Mg wires by continuous PEO had better corrosion resistance and biocompatibility. In contrast, the non-surface-treated Mg wires had a high corrosion rate, resulting in the loss of strength and ductility and no cell attachment. The PEO process formed a dense oxide layer that suppressed pitting corrosion and improved the strength of the Mg wires, enabling cell attachment.
BIOMATERIALS ADVANCES
(2023)
Article
Materials Science, Multidisciplinary
Meijuan Zhang, Anxin Ma, Javier Llorca
Summary: A numerical strategy is proposed to simulate plastic deformation in Mg alloys, which includes dislocation slip through a crystal plasticity model solved using the finite element method, and twin propagation through a phase field model solved using a fast Fourier transform algorithm. The crystal plasticity and phase field equations are solved using different discretizations of the simulation domain with the same time step. The strategy is used to simulate the compression deformation of a Mg micro-pillar and successfully predicts the stress-strain curve and dominant deformation mechanisms, demonstrating the capability of explicitly considering twin propagation in the simulation of plastic deformation in Mg alloys. Furthermore, a simulation of slip/twin interaction in polycrystals is presented to showcase the model's capabilities.
MECHANICS OF MATERIALS
(2023)
Article
Polymer Science
Yu-Yao Liu, Juan Pedro Fernandez Blazquez, Guang-Zhong Yin, De-Yi Wang, Javier Llorca, Monica Echeverry-Rendon
Summary: This study presents a strategy for manufacturing biodegradable and biocompatible 3D printable biomaterials with tunable mechanical properties and degradation rate for tissue regeneration scaffolds. The PCEC copolymers synthesized in this study showed tunable mechanical properties and degradation rate, as well as excellent cytocompatibility and cell attachment. It was also demonstrated that PCEC scaffolds with excellent dimensional accuracy and controlled microporosity can be manufactured using 3D printing.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Nanoscience & Nanotechnology
Biaobiao Yang, Jun Wang, Yunping Li, Matthew Barnett, Javier LLorca
Summary: The transformation from compression twins (CT) to double twins (DT) was studied in a dual-textured Mg-6.5%Zn(wt.) alloy during deformation along the extrusion axis. After 7.3% compression, 85% of CT transformed to DT. However, during tension, the transformation ratio dropped to 22% and 36% despite higher applied stresses and strains. The differences in DT activity could not be explained by the Schmid factor, indicating that the activation of non-basal slip plays a role in suppressing the CT to DT transformation.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Meysam Mohammadi-Zerankeshi, Mohammad Zohrevand, Reza Alizadeh
Summary: Developing antibacterial biodegradable Mg alloys is crucial for preventing infection and inflammation during healing. Mg-2Ag alloy is a suitable candidate with good biocompatibility and antibacterial activity, but its fast degradation rate hinders its clinical application. To address this issue, a hydrothermal coating technique was used to synthesize a barrier coating on the Mg-2Ag alloy using distilled water. The microstructure of the substrate played a vital role in the coating quality and degradation behavior, with the solution-treated alloy showing improved corrosion resistance compared to the as-cast alloy due to its homogenized microstructure and formation of a more compact and integrated coating.
Article
Materials Science, Multidisciplinary
Wahaaj Ali, Monica Echeverry-Rendon, Alexander Kopp, Carlos Gonzalez, Javier LLorca
Summary: The mechanical behavior, corrosion mechanisms, and cytocompatibility of magnesium wires reinforced poly-lactic acid polymer composites were investigated through a 180-day in vitro degradation study. Plasma-electrolytic oxidation surface modification of Mg wires improved the interface shear strength from 10.9 MPa to 26.3 MPa, but decreased to 8 MPa and 13.6 MPa in Mg/PLA and PEO-Mg/PLA composites after 42 days degradation. The cross-sections of the composites exhibited good cytocompatibility, with cells tending to migrate towards the PLA regions and avoiding the surface of the Mg wires. The corrosion rate of surface-modified Mg wires was significantly reduced, with only 3% mass loss after 180 days.
NPJ MATERIALS DEGRADATION
(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.
