Article
Chemistry, Physical
Klaus-Dieter Liss, Stefanus Harjo, Takuro Kawasaki, Kazuya Aizawa, Pingguang Xu
Summary: In-situ neutron diffraction was used to investigate the aluminium strontium master alloy Al-10Sr during a heating-cooling cycle, revealing its composition, crystallographic structure, lattice evolution, and thermal expansion coefficients. The expansion of the Al matrix is temperature-dependent and highly anisotropic for tetragonal Al4Sr, with values extrapolating to higher temperatures at 800K. The findings provide insights into potential improvements for the mechanical properties of Al4Sr composites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
S. N. Achary, S. J. Patwe, A. Vishwanath, Sourabh Wajhal, P. S. R. Krishna, A. K. Tyagi
Summary: The crystal structure of PbMoO4 undergoes anisotropic expansion from 5 to 300 K, with no structural transition observed in the temperature range. The expansion of unit cell volume is mainly attributed to the expansion of PbO8 bisdisphenoids, while the MoO4 tetrahedra act as rigid units. The smooth variation of anisotropic displacement parameters with temperature suggests PbMoO4 as a promising material for cryogenic applications.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Crystallography
N. Kumar, S. D. Kaushik, K. Sandeep Rao, P. D. Babu, S. K. Deshpande, S. N. Achary, Daniel Errandonea
Summary: In this study, the crystal structure and crystal chemistry of orthorhombic perovskite type Nd2CuTiO6 were analyzed using in situ temperature-dependent powder neutron diffraction (PND) studies. It was found that the cations in octahedral sites are statistically occupied and the orthorhombic structure remains stable across the entire temperature range. No long-range magnetic ordering was observed at temperatures as low as 2 K. The lattice exhibited strong anisotropic thermal expansion, with almost no or very little negative expansion along the a-axis but significant expansion along the other two axes. The rotation of octahedral units varied systematically with temperature, while the expansion of unit cells was mainly associated with the polyhedral units around the Nd(3) ions. The temperature-dependent changes in unit cell parameters and axial thermal expansion coefficients showed anomalous behavior at lower temperatures, which may be attributed to the electronic contributions to lattice expansion.
Editorial Material
Chemistry, Multidisciplinary
A. Dominic Fortes, Johannes M. Meusburger
Summary: The structure of a new polymorph of MgSO4·6H2O, a potentially important mineral on Europa, was reported but found to have a stoichiometric error where only half of the required anions were present. The study highlights the stages where this error could have been detected and provides recommendations to prevent its repetition.
ACS EARTH AND SPACE CHEMISTRY
(2022)
Article
Chemistry, Physical
Subarna Datta, Shovan Dan, Shuvankar Gupta, Sudip Chakraborty, Chandan Mazumdar
Summary: The detailed X-ray diffraction studies of rare-earth based compounds Nd2Fe17-xCrx revealed a negligible thermal expansion coefficient in the Nd2Fe16.5Cr0.5 compound, indicating a potential for zero thermal expansion magnetic systems. The critical analysis showed that all four samples belong to different types of universal magnetic class.
Article
Materials Science, Multidisciplinary
Qi Wang, Yanwu Dong, Zhouhua Jiang, Jun Huang
Summary: This study investigated the influence of Zr-rich intermetallic compounds on microstructure, thermal expansion behavior, and mechanical properties in Fe-36Ni Invar alloy. The addition of 0.22 wt% Zr significantly refined the microstructure and increased the yield strength of the alloy. The Invar alloy showed a low coefficient of thermal expansion in the temperature range of 20°C to 100°C and 20°C to 200°C after Zr treatment.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
W. J. Williams, S. C. Vogel, M. A. Okuniewski
Summary: This study characterizes the crystallographic evolution of unirradiated U-X wt.% Zr alloys (X = 6, 10, 20, 30) during cooling from 900 degrees C to ambient temperature. It was found that all alloys followed a phase transformation pathway, with a miscibility gap observed in gamma-U-Zr and simultaneous transformation of alpha-U and delta-UZr2 in the U-30 wt.% Zr sample. These findings highlight the need to reassess the U-Zr phase diagram.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Chemistry, Physical
Xunda Liu, Hiroaki Tatsumi, Zhi Jin, Zhong Chen, Hiroshi Nishikawa
Summary: To ensure optimal working conditions for next-generation power modules, it is crucial to have a comprehensive understanding of the thermo-mechanical properties of the joint layer between the chip and substrate. This study proposes a straightforward method to fabricate densified and pure Ag9In4 bulk samples, which can be a promising candidate for the joint layer. The properties of Ag9In4, including Young's modulus, hardness, creep behavior, and coefficient of thermal expansion, were measured over a temperature range of 30°C to 250°C.
Article
Chemistry, Inorganic & Nuclear
Bryce G. Mullens, Maria K. Nicholas, Frederick P. Marlton, Helen E. A. Brand, Qinfen Gu, Helen E. Maynard-Casely, Brendan J. Kennedy
Summary: Synchrotron X-ray and neutron powder diffraction methods were used to determine the structures of double scheelite compounds NaA(BO4)2. The distribution of Na and A-type cations was found to be random, regardless of the presence of 6s2 lone pairs and differences in oxidation states and ionic radii. The NaA(BO4)2 series showed linear trends in lattice parameters and polyhedra volume, except for A = Bi3+.
JOURNAL OF SOLID STATE CHEMISTRY
(2023)
Article
Nanoscience & Nanotechnology
Kunda Yao, Liang Liu, Jie Ren, Yong Guo, Yanfang Liu, Yang Cao, Rui Feng, Fufa Wu, Jingang Qi, Jian Luo, Peter K. Liaw, Wen Chen
Summary: This study successfully developed a series of high-entropy intermetallic compounds (HEICs) with exceptional high-temperature phase stability and ultrahigh compressive strength. The mechanism underlying phase formation of HEICs was revealed by combining electronegativity-related parameters and atomic size dispersity.
SCRIPTA MATERIALIA
(2021)
Article
Chemistry, Inorganic & Nuclear
Yong Xu, Xin Chen, Yili Cao, Kun Lin, Chin-Wei Wang, Qiang Li, Jinxia Deng, Jun Miao, Xianran Xing
Summary: Thermal expansion is a significant issue in materials science and engineering. This study investigates the anomalous thermal expansion of CrB2 and discovers distinctly anisotropic behavior, with positive expansion within the basal plane and negative expansion along the c direction. The research also reveals zero thermal expansion in the unit cell volume within a certain temperature range, and attributes the observed antiferromagnetic-paramagnetic transition at around 90 K to the thermal expansion anomaly. DFT calculations support the notion that the antiferromagnetic ordering is a result of the double exchange interaction of Cr-B-Cr, as there is no chemical binding of the Cr-Cr pair.
CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
(2023)
Article
Chemistry, Physical
Reece Emery, Orlando R. Rios, Eric A. Lass, Cameron S. Jorgensen, Dustin A. Gilbert, William R. Meier, Michael R. Koehler, Philip D. Rack
Summary: Al100-x-y-zCexNiyMnz thin films were synthesized via combinatorial sputtering and subsequent annealing to form stable intermetallic systems. Temperature dependent measurements revealed different coefficients of thermal expansion and electronic phase transitions for different phases in the thin films and bulk samples.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Wenjie Li, Kun Lin, Yili Cao, Chengyi Yu, Chin-Wei Wang, Xinzhi Liu, Kenichi Kato, Yilin Wang, Jiaou Wang, Qiang Li, Jun Chen, Jinxia Deng, Hongjie Zhang, Xianran Xing
Summary: A novel class of near-zero thermal expansion alloys, ErFe10V2-xMox, demonstrated unique properties over a wide temperature range. The thermal expansion behavior of the alloys is closely related to their structure and electronic valence states.
Article
Nanoscience & Nanotechnology
Daniel J. Magagnosc, Daniel M. Field, Christopher S. Meredith, Timothy R. Walter, Krista R. Limmer, Jeffrey T. Lloyd
Summary: In a newly designed medium-Mn steel with a bimodal duplex microstructure, a balance between high strength and ductility was achieved through different deformation mechanisms and strengthening mechanisms. The engineered microstructure resulted in a superior performance exceeding that of typical hot worked medium-Mn steels.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Chen Shen, Klaus-Dieter Liss, Mark Reid, Zengxi Pan, Xueming Hua, Fang Li, Gang Mou, Ye Huang, Bosheng Dong, Dongzhi Luo, Huijun Li
Summary: In this paper, Fe3Ni-FeNi compositionally graded material (FGM) was fabricated using an innovative wire-arc additive manufacturing process to achieve high thermal lattice structural stability and high corrosion resistance. A subsequent homogenization post-production heat treatment was applied to stabilize the phase composition and eliminate possible segregation in the sample. The high intensity neutron diffraction instrument WOMBAT was used to measure the phase evolution processes in-situ, showing that the FGM has uniform Ni content gradient but hot cracking defects due to inadequate interpass temperature setting.
Article
Chemistry, Physical
Xiaoyu Chen, Jiawei Wan, Meng Zheng, Jin Wang, Qinghua Zhang, Lin Gu, Lirong Zheng, Xianzhu Fu, Ranbo Yu
Summary: A precise synthesis strategy is proposed to stabilize single atomic ruthenium on nickel vanadium layered double hydroxides (NiV-LDH) ultrathin nanoribbons support. The resulting NiVRu-R catalyst demonstrates superior catalytic properties for electrocatalytic hydrogen evolution reaction (HER) in alkaline media, outperforming the commercial Pt/C catalyst. The stability of NiVRu-R is maintained even after 5,000 cyclic voltammetry cycles, which is attributed to the Ru atomic sites stabilized on supports through the Ru-O-V structure.
Article
Engineering, Environmental
Pu Wang, Wenying Meng, Weiwei Zhang, Min Fu, Yingming Li, Ruiqiang Yang, Qinghua Zhang, Guibin Jiang
Summary: The occurrence of persistent organic pollutants (POPs) in the Polar Regions has caused concerns due to their long-term adverse effects on the fragile environment. However, the source and fate of these pollutants in pristine areas are still being debated. In this study, a novel approach called compound-specific isotope analysis of chlorine (CSIA-Cl) was used to identify the source of POPs in Antarctic air by comparing it with the source area. The results showed that the isotope-ratio variation of Cl values in the gas-phase samples exhibited a large variation and was correlated with the logKoa values of PCBs. The study highlights the potential application of CSIA-Cl for source identification of chlorinated POPs on a large scale.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
W. Woo, Y. S. Kim, H. B. Chae, S. Y. Lee, J. S. Jeong, C. M. Lee, J. W. Won, Y. S. Na, T. Kawasaki, S. Harjo, K. An
Summary: In situ neutron diffraction experiments were conducted to investigate the behavior of cast-wrought (CW) and additively manufactured (AM) equiatomic CoCrNi medium-entropy alloys under loading. The study found that the dislocation density and stacking/twin fault probability increased significantly near fracture. The flow stress and strengthening mechanisms were also analyzed, showing the impact of dislocation slip and deformation twinning.
Article
Materials Science, Multidisciplinary
D. Xie, Z. H. Li, T. T. Sasaki, Y. F. Gao, Z. Y. Lyu, R. Feng, Y. Chen, K. An, H. B. Chew, T. Nakata, S. Kamado, K. Hono, P. K. Liaw
Summary: The low-alloyed Mg-Al-Ca-Mn alloy, as a new class of heat-treatable magnesium alloys, shows great engineering potential due to its excellent extrudability and high strength achieved by the dispersion of Guinier-Preston (G.P.) zones. In this study, in situ neutron diffraction measurements were conducted to investigate the cyclic deformation behavior of this alloy with and without G.P. zone dispersion. The relationship between macroscopic deformation behavior and microscopic response at the grain level, such as twinning and detwinning, was established.
Article
Chemistry, Physical
Yongfang Sun, Huan Ma, Yueyue Jiao, Yunlei Chen, Xiaoze Yuan, Xiangyu Zhang, Fei Wang, Dongdong Xiao, Yi Wang, Dachao Hong, Yuwei Zhou, Lin Gu, Yong Yang, Yongwang Li, Xiao-Dong Wen
Summary: Ternary intermetallic electrides (LaTMSi) are a class of electride materials with unique geometric and electronic structures, showing excellent catalytic performance. The structural stability of LaTMSi in air and water is higher compared to conventional electrides. However, their catalytic activities decrease in the presence of H2O as the product. High-temperature calcination can remove the deactivated surface caused by exposure to H2O, but frequent reactions with H2O and calcination can lead to complete phase transition to oxides. The dissociation of H2O and phase transition are also observed in LaCoSi and LaNiSi ternary intermetallic electrides.
CHEMISTRY OF MATERIALS
(2023)
Article
Engineering, Environmental
Jingqian Xie, Gaoxin Zhang, Qiang Wu, Min Luo, Duofu Chen, Yu Zhang, Lisheng He, Yingming Li, Qinghua Zhang, Tian Lin, Guibin Jiang
Summary: This study analyzed the concentrations, influencing factors, and potential sources of PBDEs and NBFRs in hadal sediments and amphipods from the Mariana, Mussau, and New Britain trenches. The dominant PBDEs congener was BDE 209, and the dominant NBFRs was DBDPE. There was no significant correlation between TOC contents and PBDEs or NBFRs levels in sediment. The lipid content and body length were important factors affecting pollutant concentrations in amphipods, while the pollution levels of viscera were mainly influenced by sex and lipid content. PBDEs and NBFRs might reach trench surface seawater through long-range atmospheric transport and oceans currents but with little contribution from the Great Pacific Garbage Patch. Determination of carbon and nitrogen isotopes indicated that the pollutants were transported and accumulated in amphipods and sediment via different pathways. This study provides new insights into the influencing factors and sources of PBDEs and NBFRs in the deepest oceans.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Chemistry, Physical
Bin Chi, Longhai Zhang, Xiaoxuan Yang, Yachao Zeng, Yijie Deng, Mingrui Liu, Junlang Huo, Chaozhong Li, Xiaorong Zhang, Xiudong Shi, Yijia Shao, Lin Gu, Lirong Zheng, Zhiming Cui, Shijun Liao, Gang Wu
Summary: This study reports the co-doping of Zr and Fe dual metal sites into a ZIF-8-derived mesoporous carbon for improved durability and activity in the oxygen reduction reaction. The Zr-doped Fe-N-C catalyst showed only 25% voltage loss after 20 hours of continuous operation and retained 40% of its initial performance after 100 hours, outperforming the catalyst without Zr doping. The cathode also exhibited significantly enhanced ORR activity, achieving a maximum power density of 0.72 W cm-2.
Article
Chemistry, Physical
Yujie Shi, Yijie Wang, Jiayuan Yu, Yuke Chen, Chaoqiong Fang, Di Jiang, Qinghua Zhang, Lin Gu, Xiaowen Yu, Xiao Li, Hong Liu, Weijia Zhou
Summary: Researchers fabricated ultra-small SnO2/Cu6Sn5/CuO nanocatalysts with superscalar phase boundaries by laser sputtering. The introduction of SnO2 enhances the adsorption and activation of CO2, while CuO promotes H2O decomposition and provides abundant *H intermediates, resulting in efficient CO2RR and high selectivity to formic acid. In situ infrared spectroscopy and kinetic isotope effects experiments confirmed the role of multiphase boundaries.
ADVANCED ENERGY MATERIALS
(2023)
Article
Gastroenterology & Hepatology
Zhaoya Gao, Yanzhao Wang, Qingmin Zeng, Wanshui Rong, Zilong Wang, Zhichao Zhai, Changmin Ding, Ke An, Qingkun Gao, Pengfei Niu, Yuming Hong, Xiaomang He, Wensheng Huang, Fuming Lei, Bing Wen, Xin Wang, Jin Gu
Summary: The study aimed to investigate the efficacy of multiple perineal perforator flaps in repairing deep perineal defects after pelvic exenteration for locally advanced or recurrent rectal cancer. The results showed that using multiple perineal perforator flaps combined with lining repair is feasible and does not lead to functional limitations in daily activities.
COLORECTAL DISEASE
(2023)
Article
Physics, Condensed Matter
Jin Liu, Lei Gao, Yu Ting Zou, Ting Lin, Ming Tong Zhu, Xiang Yu Lyu, Chao Lu, Yu Qian Wang, Ai Ling Ji, Qing Hua Zhang, Zhi Gang Cheng, Lin Gu, Ze Xian Cao, Nian Peng Lu
Summary: High-quality RuO2 thin films with clear lattice structure were obtained through optimizing the growth conditions. The electronic transport was studied, and emergent electronic states and the relevant physical properties were unveiled. The complex phase diagram with multiple intriguing emergent electronic states over a wide temperature range was mapped.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Energy & Fuels
Dong Luo, He Zhu, Yi Xia, Zijia Yin, Yan Qin, Tianyi Li, Qinghua Zhang, Lin Gu, Yong Peng, Junwei Zhang, Kamila M. Wiaderek, Yalan Huang, Tingting Yang, Yu Tang, Si Lan, Yang Ren, Wenquan Lu, Christopher M. Wolverton, Qi Liu
Summary: A composite structure of lithium-rich materials can effectively mitigate the problem of voltage decay during cycling, improving the performance of Li-ion batteries.
Article
Materials Science, Multidisciplinary
Yingjun Sun, Wenshu Zhang, Qinghua Zhang, Yingjie Li, Lin Gu, Shaojun Guo
Summary: High-entropy alloys (HEAs) have great potential for efficient catalyst discovery. We report a method for constructing atomic-thick Pt-based HEA nanowires (NWs) with multiple components. The key points in forming a uniform HEA single-phase solid solution are the initial formation of Pt NWs and the nucleation rate of other transition metals. Our method can synthesize 26 kinds of multimetallic NWs, including 17 HEAs. The high-entropy design introduces lattice distortion, altering the strain distribution and electronic structure, enabling the HEA NWs to exhibit outstanding catalytic performance in hydrogen oxidation and evolution reactions.
Article
Multidisciplinary Sciences
Sirui Zhang, Qinghua Zhang, Fanqi Meng, Ting Lin, Binjian Zeng, Lin Gu, Min Liao, Yichun Zhou
Summary: HfO2-based ferroelectrics with complementary metal-oxide semiconductor compatibility and robust ferroelectricity have attracted much attention. However, the unique wake-up effect of HfO2-based ferroelectric films hinders their performance improvement. This study investigates the domain structure of a Hf0.5Zr0.5O2 ferroelectric thin film and reveals the presence of 90 degrees and 180 degrees domains with different domain wall orientations. The findings provide fundamental information for understanding the domain structure of HfO2-based ferroelectrics.
Article
Chemistry, Multidisciplinary
Changchun Ye, Zhenghui Pan, Qinghua Zhang, Fang Yin, Yanan Wang, Yifei Li, Guangxu Chen, Jia Li, Yongcai Qiu, Geoffrey I. N. Waterhouse, Lin Gu, Zhang Lin, Lin Guo
Summary: A facile synthesis route for heterostructured metal oxides via quenching-induced structural transformation was developed. Multiple quenching triggered the transformation from NiMoO4 to NiFe2O4, creating a novel heterostructure, and the pre-quenching generated disordered defect structure can promote subsequent quenching regulation.
ENERGY & ENVIRONMENTAL SCIENCE
(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.