Article
Materials Science, Multidisciplinary
Y. H. Meng, S. Y. Zhang, W. H. Zhou, J. H. Yao, S. N. Liu, S. Lan, Y. Li
Summary: Structural relaxation and subsequent rejuvenation through thermal treatment can improve the plasticity and fracture toughness of metallic glasses. The recovery of loosely packed regions in the atomic structure during annealing contributes to the observed rejuvenation. Tailoring the mechanical properties of metallic glasses can be achieved by controlling the annealing and thermal treatment conditions.
Review
Metallurgy & Metallurgical Engineering
Youhong Peng, Kesong Miao, Wei Sun, Chenglu Liu, Hao Wu, Lin Geng, Guohua Fan
Summary: Characterizing the microstructure and deformation mechanism of metallic materials is crucial for understanding the microstructure-property relationship. Advanced synchrotron radiation facilities have enabled non-destructive visualization of full-field structural information in three dimensions, contributing to significant progress in recent decades. Future innovations in next-generation synchrotron radiation and emerging technologies hold great potential for further advancements in material characterization.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Tao Liang, Lianghua Xiong, Hongbo Lou, Fujun Lan, Junran Zhang, Ye Liu, Dongsheng Li, Qiaoshi Zeng, Zhidan Zeng
Summary: The mechanical properties of hexagonal silicon (Si-IV) were experimentally studied, revealing that Si-IV has similar elastic modulus and hardness to the common diamond cubic silicon. This similarity enables the integration of Si-IV into conventional Si-based devices and its potential for photovoltaic and optoelectronic applications.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Ceramics
Xi Zhao, Si Lan, Lina Hu, Zhenduo Wu, Yaqiang Dong, Yang Ren, Xun-Li Wang
Summary: This study reveals the magnet-influenced beta relaxation in Fe-based metallic glasses and its interaction with magnetic ordering, and finds a two-stage relaxation behavior with the pinning effect of Curie temperature in the first stage and its disappearance in the second stage.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Qing Du, Xiong-Jun Liu, Yihuan Cao, Qiaoshi Zeng, Hui Wang, Yuan Wu, Suihe Jiang, Xiaobin Zhang, Zhao-Ping Lu
Summary: In this study, the chemical dependence of thermally induced reentrant glass transition in (PdNi)(100-x)P-x MGs was systematically investigated. It was found that the reentrant glass transition in alloys with a P content of < 17 at% is suppressed with an increase in P. The composition dependence of the reentrant glass transition originates from the rearrangement of the metal-metalloid bond (i.e., Pd/Ni-P bonds) and the consequent short-range ordering to medium-range ordering.
SCIENCE CHINA-MATERIALS
(2023)
Article
Metallurgy & Metallurgical Engineering
Zeng Qiaoshi, Yin Ziliang, Lou Hongbo
Summary: Metallic glasses possess unique properties due to their densely packed and disordered atomic structures. Recent studies have shown polyamorphic transitions in metallic glasses, sparking excitement and interest in understanding their underlying mechanisms and property changes. These transitions offer new possibilities for tunable properties in materials science.
ACTA METALLURGICA SINICA
(2021)
Article
Chemistry, Physical
Stefan Michalik, Zuzana Molcanova, Michaela Sulikova, Katarina Kusnirova, Pal Jovari, Jacques Darpentigny, Karel Saksl
Summary: The Mg-Zn-Ca system was investigated for its glass-forming ability by fabricating ribbon specimens using melt-spinning technique with a concentration line of 7 at.% calcium. The samples were characterized to determine their mass density, hardness, elastic modulus, and crystallisation temperatures. Pair distribution functions obtained by HEXRD and ND measurements described the amorphous structure, revealing contributions of Mg-Mg, Mg-Zn, and Zn-Zn pairs. In situ HEXRD showed the transformation process from amorphous to crystalline structure for Mg60Zn33Ca7 and Mg50Zn43Ca7, proposing the formation of intermetallic compounds IM1 and IM3 as well as hcp-Mg phase in multiple crystallisation events.
Article
Materials Science, Multidisciplinary
Xiaoliang Han, Ivan Kaban, Jiri Orava, Qi Cheng, Yong Hao Sun, Ivan Soldatov, Martin V. Zimmermann, Kaikai Song, Kornelius Nielsch
Summary: The crystallization behavior of Cu 47.5 Zr 48 Al 4 Co 0.5 metallic glass is investigated using various techniques, revealing the competition between different crystalline phases depending on heating rate and the role of Co alloying.
Article
Materials Science, Multidisciplinary
Dianyin Hu, Jinchao Pan, Jianxing Mao, Shuhao Hu, Xi Liu, Yanan Fu, Rongqiao Wang
Summary: This paper investigates the nucleation, growth, and coalescence of voids in additive manufacturing materials using a damage model and synchrotron radiation X-ray topography, revealing the nature of true stress drop. Statistical reconstruction and Bayesian framework are utilized for parameter estimation, successfully verifying the model in depicting damage evolution and affected deformation performance. This work contributes to material design and defect control for additive manufactured load-bearing structures.
MATERIALS & DESIGN
(2021)
Article
Chemistry, Physical
Xiaoliang Han, Jiri Orava, Qi Cheng, Yong Hao Sun, Shilei Liu, Oleh Ivashko, Kaikai Song, Kornelius Nielsch, Ivan Kaban
Summary: The crystallization mechanism and solid-state phase transformations in Cu46.5Zr48Al4Nb1.5 metallic glass were studied using various techniques. Heat treatment diagrams were constructed to illustrate the formation and evolution of different phases. Compared to the parent glass, Cu46.5Zr48Al4Nb1.5 metallic glass showed a higher propensity for a specific phase formation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
D. V. Lazurenko, I. Yu. Petrov, V. I. Mali, M. A. Esikov, R. I. Kuzmin, V. V. Lozanov, F. Pyczak, A. Stark, G. D. Dovzhenko, I. A. Bataev, D. S. Terentiev, A. A. Ruktuev
Summary: This study aims to improve the brittleness issue of Ti-Al3Ti metal-intermetallic laminate composites by changing the crystal structure of Al3Ti to the more ductile L12 structure through alloying with silver. The optimal fabrication regimes of Ti-Ti(Al1-xAgx)3 composites were determined based on in-situ synchrotron X-ray diffraction analysis, leading to enhanced properties of the composite material.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Antoine Cornet, Gaston Garbarino, Federico Zontone, Yuriy Chushkin, Jeroen Jacobs, Eloi Pineda, Thierry Deschamps, Shubin Li, Alberto Ronca, Jie Shen, Guillaume Morard, Nico Neuber, Maximilian Frey, Ralf Busch, Isabella Gallino, Mohamed Mezouar, Gavin Vaughan, Beatrice Ruta
Summary: By combining the brightest x-rays available in synchrotrons with cutting edge high pressure technologies, this study provides direct evidence of the microscopic structural and dynamical mechanisms occurring under in-situ high pressure compression and decompression in metallic glasses. The results show that while pressure promotes density increasing through quasi-elastic structural deformations, the atomic mobility exhibits a hysteresis and is enhanced up to a factor 15 even at temperatures well below the glass transition. This surprising behavior results from a competition between fast avalanche-like atomic rearrangements and slow relaxation processes triggered by an anomalous super-diffusive collective particle displacement.
Article
Chemistry, Physical
J. Antonowicz, P. Zalden, K. Sokolowski-Tinten, K. Georgarakis, R. Minikayev, A. Pietnoczka, F. Bertram, M. Chaika, M. Chojnacki, P. Dluzewski, K. Fronc, A. L. Greer, C. Jastrznbski, D. Klinger, Ch Lemke, O. M. Magnussen, B. Murphy, K. Perumal, U. Ruett, K. J. Warias, R. Sobierajski
Summary: In this study, ultrafast heating and rapid cooling processes in the devitrification of thin film Cu67Zr33 metallic glass were investigated using ultrashort pulsed laser annealing. X-ray diffraction snapshots were taken during the glass-crystal transformation, revealing the formation of a crystalline ZrO2 layer and the nucleation and growth of fcc-Cu in the amorphous matrix. At low annealing temperatures, the devitrification kinetics of ZrO2 and Cu are correlated, while at high temperatures ZrO2 forms much faster than Cu.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Review
Nanoscience & Nanotechnology
Pooja Maurya, Navya Kota, Jens Gibmeier, Alexander Wanner, Roy Siddhartha
Summary: This systematic review enhances the understanding of metal matrix composites (MMCs) and their micromechanics by examining different diffraction-based methods of internal load transfer. Internal load transfer is significant in conventional MMCs with high volume fractions of reinforcement particles, and its mechanism depends on various factors. Advanced diffraction-based techniques, such as neutron diffraction and synchrotron X-ray diffraction, have successfully been used to study internal load transfer in MMCs, allowing the measurement of elastic lattice strains and the calculation of phase stress. The information obtained about deformation and damage within the composite material contributes to the overall understanding of MMCs.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Multidisciplinary Sciences
Yuan Wu, Di Cao, Yilin Yao, Guosheng Zhang, Jinyue Wang, Leqing Liu, Fengshou Li, Huiyang Fan, Xiongjun Liu, Hui Wang, Xianzhen Wang, Huihui Zhu, Suihe Jiang, Paraskevas Kontis, Dierk Raabe, Baptiste Gault, Zhaoping Lu
Summary: By introducing dense local packing regions in BMGs, enhancing structural fluctuations has led to a simultaneous increase in ductility and strength.
NATURE COMMUNICATIONS
(2021)
Article
Nanoscience & Nanotechnology
Hekang Zhu, Tingting Yang, Pui-Kit Lee, Zijia Yin, Yu Tang, Tianyi Li, Leighanne C. Gallington, Yang Ren, Denis Y. W. Yu, Qi Liu
Summary: A facile method is developed to synthesize porous Ni-rich materials, which exhibit high capacity and stability as cathode materials.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Binghao Zhang, He Zhu, Yang Ren, Hekang Zhu, Weitong Lin, Ji-Jung Kai, Tianyi Li, Leighanne C. Gallington, Jincan Ren, Yalan Huang, Si Lan, Xiaopeng Tang, Qi Liu
Summary: The lifespan of lithium-ion batteries is influenced by unpredictable and complicated operation conditions. This study shows that the pause during charging-discharging process can cause significant capacity drop and reactivates harmful phase transition, leading to performance degradation. The discontinuous usage of rechargeable batteries is identified as a key factor for cycle life.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Yuhai Qu, Xiaoming Sun, Wanyuan Gui, Runguang Li, Zhihua Nie, Zhiyong Gao, Wei Cai, Yang Ren, Yandong Wang, Daoyong Cong
Summary: Magnetic-field-induced first-order magnetostructural transition (MFI-FOMST) has various magnetoresponsive effects, but practical applications have been limited by the high critical field. In this study, we achieved complete and reversible MFI-FOMST under a low field of 1.5 T in a prototype shape memory alloy. This was made possible by enlarging the distance between Curie transition and magnetostructural transition and manipulating the geometric compatibility between phases. The low critical field provides opportunities for low-field-induced large reversible magnetoresponsive effects and practical applications of MSMAs.
Article
Chemistry, Multidisciplinary
Shitong Wang, Lijiang Zhao, Yanhao Dong, He Zhu, Yang Yang, Haowei Xu, Baoming Wang, Yakun Yuan, Yang Ren, Xiaojing Huang, Wei Quan, Yutong Li, Yimeng Huang, Charles M. Settens, Qi He, Yongwen Sun, Hua Wang, Zunqiu Xiao, Wenjun Liu, Xianghui Xiao, Riqiang Fu, Qiang Li, Yong S. Chu, Zhongtai Zhang, Qi Liu, Andrew M. Minor, Junying Zhang, Zilong Tang, Ju Li
Summary: Wadsley-Roth oxides (WROs) with pore diameters of 2.5 angstrom < d < 2.8 angstrom allow rapid diffusion of Li+ in single-crystal particles, enabling high-rate charge cycles similar to gasoline vehicles and improving the cycle life up to 10,000 cycles.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Materials Science, Ceramics
Abhijit Pramanick, Laurent Daniel, Sarangi Venkateshwarlu, Valentin Segouin, Yang Ren
Summary: Through experimental and modeling results, we have discovered a unique tetragonal-to-orthorhombic-to-tetragonal phase transformation induced under low electric fields (< 1 kV/mm) in grains with 002 crystallographic poles oriented either within 20 degrees or orthogonal to the applied electric-field direction in a polycrystalline Pb-free piezoceramic. In contrast, grains with their 002 poles oriented 30 degrees- 80 degrees to the electric-field direction undergo a continuous tetragonal-to-orthorhombic transformation for electric fields larger than 1 kV/mm. These findings highlight the critical role of a phase-transition-assisted domain switching mechanism in grains of specific orientations towards achieving a large electrostrain coefficient of d(33)* similar to 600 pm/V under low electric fields (< 1 kV/mm) in the Pb-free Sn-doped (Ba,Ca)(Zr,Ti)O-3 piezoceramic.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Nanoscience & Nanotechnology
Yingchao Li, Junsong Zhang, Martin Saunders, Yang Ren, Hong Yang, Yinong Liu
Summary: By utilizing the principles of lattice strain matching and collective atomic load transfer, ultralarge elastic strains were induced in a brittle NiTi-Nb3Sn eutectic composite, where Nb3Sn lamellae achieved a remarkable elastic lattice strain of -2.4%. This study both tests the applicability of lattice strain matching in brittle materials and explores a novel fabrication approach for in-situ composites via eutectic solidification.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Environmental Sciences
Tingting Kang, Han Wang, Zhangyuan He, Zhengying Liu, Yang Ren, Pengjun Zhao
Summary: This paper explores the impact of land use change on energy-related CO2 emissions using multi-dimension metrics. The results indicate that the scale of land use types has a bidirectional effect on emissions; land use mixture in mature city agglomerations has a significant suppressive effect; land use intensity is associated with emissions in most cities, with adverse effects spreading from west to northeast. Therefore, it is suggested to regulate land transaction, promote mixed land use, and utilize renewable energy to reduce energy footprints and mitigate emissions.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Review
Materials Science, Multidisciplinary
Jie Yan, Weixia Dong, Peijian Shi, Tianyi Li, Wenjun Liu, Yan-Dong Wang, Xun-Li Wang, Yuntian Zhu, Yang Ren
Summary: Heterostructured materials (HSMs) have the potential to break the strength-ductility tradeoff, but understanding their deformation physics and strengthening mechanisms is challenging due to their complex structures. Synchrotron x-rays provide powerful techniques for studying HSMs at different length scales. This article introduces in situ high-energy x-ray diffraction and Laue x-ray microdiffraction techniques and their application in studying stress partitioning, phase transformations, and deformation microstructures in HSMs.
Article
Materials Science, Multidisciplinary
Jiacheng Ge, Peng Luo, Zhenduo Wu, Wentao Zhang, Sinan Liu, Si Lan, Jonathan D. Almer, Yang Ren, Xun-Li Wang, Weihua Wang
Summary: Studying the flow behavior of amorphous solids is crucial for understanding their deformation mechanism, but detecting basic flow events in these materials is challenging. Using simultaneous SAXS/WAXS experiments, researchers have identified elementary flow carriers in wound metallic glasses, with a radius of gyration ranging from 2.5 to 3.5 nm, based on flow-induced structural heterogeneities. The size of these carriers increases and their morphology changes from spherical to rod-like during flow. Additionally, the atomic structure undergoes an unusual change to a more disordered state during winding/annealing at a temperature around 0.8 Tg. This work provides an atomic-to-nanoscale description of flow carriers in amorphous solids during deformation.
MATERIALS RESEARCH LETTERS
(2023)
Article
Chemistry, Physical
Jincan Ren, Yu Tang, Weibao Li, Dong He, He Zhu, Xingyu Wang, Si Lan, Zijia Yin, Tingting Yang, Zhaowen Bai, Yang Ren, Xiangheng Xiao, Qi Liu
Summary: A synergetic strategy of La, Mg co-doping and LiAlO2@Al2O3 surface coating is designed to enhance the performance of LiCoO2 (CM-LCO) cathode material under extreme temperatures. CM-LCO exhibits excellent temperature adaptability and remarkable electrochemical performance, as well as excellent cycle stability and high-rate performance. The synergistic effects of this co-modification strategy are demonstrated by investigating the electrochemical reaction kinetics and structure evolution of CM-LCO, providing a promising strategy for the application of high-voltage LCO in a wide temperature range.
Article
Materials Science, Multidisciplinary
Shengbiao Zhang, Peijun Hou, Jiyun Kang, Tianyi Li, Shahryar Mooraj, Yang Ren, Catherine H. Chen, A. John Hart, Simos Gerasimidis, Wen Chen
Summary: As transportation infrastructure ages, repairing damaged structures like steel bridges becomes increasingly important. This study developed a laser-based additive manufacturing method for repairing corroded beams in steel bridges. The promising potential of employing additive manufacturing for structural repair was shown, along with fundamental insights into the relationships between processing, structure, and properties in laser additive manufacturing-repaired materials.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Yanming Sun, Yili Cao, Shixin Hu, Maxim Avdeev, Chin-Wei Wang, Sergii Khmelevskyi, Yang Ren, Saul H. Lapidus, Xin Chen, Qiang Li, Jinxia Deng, Jun Miao, Kun Lin, Xiaojun Kuang, Xianran Xing
Summary: By high-temperature synthesis, researchers have achieved tunable thermal expansion in the kagome cubic (Fd-3m) intermetallic (Zr,Nb)Fe-2 materials. By magnetic doping, they have obtained a near-zero thermal expansion coefficient, which has significant applications in advanced technologies.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Fan Xue, Qiang Li, Mingxin Lv, Yuanfei Song, Tianxing Yang, Xiaoge Wang, Tianyi Li, Yang Ren, Koji Ohara, Yufei He, Dianqing Li, Qiheng Li, Xin Chen, Kun Lin, Xianran Xing
Summary: This study reports the local structure of Pd nanocatalysts, revealing the atomic surface distribution of unique compressed strain in Pd nanocatalysts. The surface strain, induced by the shape of the catalyst, significantly weakens the adsorption energy of ethylene and avoids the over-hydrogenation of acetylene, leading to higher selectivity for ethylene.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Jian Hui, Qingyun Hu, Hongjian Yuan, Ruiqian Shi, Xiang Huang, Yuanyuan Wu, Yang Ren, Zhan Zhang, Hong Wang
Summary: By using high-throughput experiments, the optical properties and structural evolution of Ge-Sb-Te alloy films were studied, and it was found that the modulation period and chemical composition have a significant impact on amorphous stability and optical properties.
Article
Materials Science, Multidisciplinary
Jiacheng Ge, Yao Gu, Zhongzheng Yao, Sinan Liu, Huiqiang Ying, Chenyu Lu, Zhenduo Wu, Yang Ren, Jun-ichi Suzuki, Zhenhua Xie, Yubin Ke, Jianrong Zeng, He Zhu, Song Tang, Xun-Li Wang, Si Lan
Summary: Fe-based metallic glasses are promising materials in the fields of advanced magnetism and sensors. This study proposes a novel approach to tailor the amorphous structure through liquid-liquid phase transition, and provides insights into the correlation between structural disorder and magnetic order. The results show that the liquid-liquid phase transition can induce more locally ordered nanodomains, leading to stronger exchange interactions and increased saturation magnetization. The increased local heterogeneity also enhances magnetic anisotropy, resulting in a better stress-impedance effect.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(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.
