Article
Chemistry, Physical
Wanwu Ding, Lumin Gou, Liwen Hu, Haixia Zhang, Wenjun Zhao, Jinyuan Ma, Jisen Qiao, Xiaochun Li
Summary: This paper investigates the effects of a novel Al-3Ti-4.35La master alloy on the morphology of eutectic Si and mechanical properties of hypoeutectic Al-7Si alloy, and reveals its modification mechanism. The results show that the addition of Al-3Ti-4.35La master alloy can transform the eutectic Si phase into a fine fiber and partial granular structure, significantly enhancing the ultimate tensile strength and elongation of the alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Feipeng Yang, Jianying Wang, Tao Wen, Lei Zhang, Xixi Dong, Dong Qiu, Hailin Yang, Shouxun Ji
Summary: The AM aluminium alloy Al5Mg3Zn2Si developed in this work exhibits high strength, ductility, and excellent mechanical properties without the addition of costly alloying elements. With an optimized relative density and refined microstructure, it has great potential for automotive and aerospace applications.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
T. Nakata, C. Xu, K. Sugiya, Y. Yoshida, K. Yoshida, L. Geng, S. Kamado
Summary: An anomalous in-plane anisotropy was observed in a basal-textured Mg-Al-Zn alloy sheet due to the high activation of tensile twinning induced by a small fraction of transverse direction (TD)-oriented (0001) poles. This led to deteriorated tensile properties along the TD, emphasizing the importance of microtexture design for high-performance wrought magnesium.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Microscopy
Mengyu Li, Tong Gao, Chunxiao Li, Yue Sun, Yuying Wu, Xiangfa Liu
Summary: An Al-15 Al2O3 alloy was added to the Al-12Si melt to study the effect of Al2O3 nanoparticles on eutectic Si crystals. It was observed that Al2O3 clusters were either partly engulfed by eutectic Si or distributed around them. This resulted in a transformation of flake-like eutectic Si to granular or worm-like structures, influenced by Al2O3 nanoparticles on the growth behavior of eutectic Si crystals. The orientation relationship between Si and Al2O3 was identified, and the possible mechanisms for modification were discussed.
Article
Materials Science, Multidisciplinary
Y. Ge, M. Vronka, P. Vertat, M. Karlik, S. P. Hannula, O. Heczko
Summary: Three possible twinning modes and corresponding twin boundaries in 2H martensite of Cu 69.4 Ni 3.4 Al 27.2 single crystal were studied. The results show that these twin boundaries have differences and are closely related to twinning stress or twin-boundary mobility.
Article
Materials Science, Multidisciplinary
Kyle Tsaknopoulos, Jack Grubbs, Bryer C. Sousa, Matthew Siopis, Aaron Nardi, Danielle L. Cote
Summary: Metal additive manufacturing is a constantly developing approach. This study investigates the use of alloys designed for AM in solid-state processing and proposes methods to improve processing performance through heat treatment and parameter optimization.
MATERIALS & DESIGN
(2022)
Article
Nanoscience & Nanotechnology
Chang Liu, Jianan Chen, Yifan Wang, Wangwang Ding, Qiying Tao, Gang Chen, Wei Cai, Mingli Qin, Xuanhui Qu
Summary: A nanoscale Ti-1Fe dual-phase alloy was fabricated using laser powder bed fusion, and its microstructure, phase constituent, and tensile properties were investigated. The interfacial coherency between different phases and the presence of dislocations at grain boundaries were found to effectively facilitate the formation of deformation twins, leading to excellent tensile strength and ductility. This study suggests a promising approach to designing high-performance and cost-effective titanium materials without the need for expensive alloying elements.
SCRIPTA MATERIALIA
(2023)
Article
Nanoscience & Nanotechnology
Minbo Wang, Ruidi Li, Tiechui Yuan, Jingtao Kang, Pengda Niu, Dan Zheng, Zhiqi Fan
Summary: By adding Si to Al-Mn-Sc alloy, a aging strengthened aluminum alloy with stable quasicrystal phase for additive manufacturing was developed, where the transformation of QC-Al81Mn19 in as-printed sample to QCAl74Mn20Si6 occurred during aging strengthening through long-range reaction-diffusion of Si atoms.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Hiroyuki Kawaura, Ryo Suzuki, Yasuhito Kondo, Yuji Mahara
Summary: A scalable process for producing Si anodes with excellent cycle characteristics was developed, by controlling their morphology and structure. The porous Si anodes prepared from Al-Si alloy powders exhibited reversible discharge capacity of 1607 mAh g(-1) after 200 cycles at a rate of 0.1 C with high stability and Coulombic efficiency. This manufacturing process shows great potential for producing high-capacity and long-life lithium-ion batteries.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Lu Liu, Chunxiang Cui, Hongtao Geng, Yingguang Liang, Sen Cui, Shichang Lei, Shuo Zhang
Summary: Adding TiC-Al2O3/Al ribbons significantly improves the mechanical properties of TiC-Al2O3/Al-Si-Mg-Ti alloy, including increased elastic modulus, yield strength, ultimate tensile strength, hardness, and elongation. It also modifies the morphology of the eutectic silicon.
MATERIALS RESEARCH EXPRESS
(2022)
Article
Nanoscience & Nanotechnology
Yuki Otani, Naoki Takata, Asuka Suzuki, Makoto Kobashi, Masaki Kato
Summary: Microstructural origins of anisotropic tensile ductility in aluminum alloys fabricated by laser powder bed fusion (L-PBF) were investigated. Strain analysis using digital image correlation (DIC) and in-situ SEM observations were conducted to quantify the local strain distribution inside melt-pool (MP) structures. It was found that higher strain was localized in locally coarsened microstructures along MP boundaries (MPBs), which played a significant role in crack initiation and propagation, leading to fracture. The orientation of MPBs relative to the loading direction controlled by the building direction of L- PBF samples influenced the strain localization and ultimately resulted in anisotropic ductility.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Feipeng Yang, Jianying Wang, Tao Wen, Shilong Huang, Zhilin Liu, Shouxun Ji, Hailin Yang
Summary: A novel high strength Al-Mg alloy was fabricated using laser powder bed fusion (LPBF) and microalloying of cost-effective Si and Zn elements. The microstructures exhibited nanosized cellular eutectic Mg2Si and solute supersaturation of Zn. The as-LPBFed Al-5Mg-2Si-1.4Zn alloys showed high ultimate tensile strength of 506 MPa, yield strength of 382 MPa, and elongation of 7.3%. This study provides a new strategy for fabricating high strength Al-Mg alloys using LPBF.
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
Nanoscience & Nanotechnology
Aina Edgren, Erik Stroem, Lars Frisk, Farid Akhtar, Magnus Hornqvist Colliander
Summary: The purpose of this study was to investigate the effect of adding Al2O3 particles to polycrystalline Mo(Si,Al)2 on its mechanical properties at high temperature. Compression tests were conducted on Mo(Si,Al)2-Al2O3 composites containing 0-25 wt% Al2O3 particles at 1300 degrees C, and the microstructure after deformation was examined using electron backscatter diffraction. The results showed that even a small amount (5 wt%) of Al2O3 particles could refine the grain size of the material by inhibiting grain growth during sintering, resulting in lower flow stresses compared to the Al2O3-free material with coarse grain. The deformation mechanisms in the fine-grained Mo(Si,Al)2-Al2O3 composites at 1300 degrees C were dominated by creep-like behavior, as indicated by the inverse grain size effect and post-test microstructure investigations. The addition of 5-15 wt% Al2O3 decreased the maximum stress, while higher Al2O3 contents increased the maximum stress but did not reach the strength levels of the Al2O3-free reference material. The deformation behavior was suggested to be influenced by electroplasticity effects due to resistive heating, with the decrease in maximum stress in the low Al2O3 containing materials outweighed by particle strengthening at higher Al2O3 contents.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Qiang Yang, Zixiang Yan, Shuhui Lv, Kai Guan, Xin Qiu
Summary: Abnormal creep stress exponents were reported for heat-resistant magnesium alloys without detailed explanation on underlying creep mechanisms. The study on a Mg-3.76Al-3.52RE-0.23Mn alloy showed varying n-values at different stresses, with microstructural analysis suggesting changes in dominant creep mechanisms. Introducing threshold stress and internal stress helped rationalize the abnormal n-values, providing insights for improving creep resistance in magnesium alloys.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Multidisciplinary
Abu Talha Aqueel Ahmed, Sankar Sekar, Shubhangi S. Khadtare, Nurul Taufiqu Rochman, Bathula Chinna, Abu Saad Ansari
Summary: In this study, MnCo2S4 nanosheet catalyst was successfully synthesized and found to exhibit superior performance in hydrogen evolution. Compared to MnCo2S4, MnCo2S4 showed low overpotentials, moderate Tafel slope, and excellent sustainability. The outstanding performance can be attributed to the increased number of electrochemically active sites and enhanced electronic conductivity on the catalyst surface.
Article
Chemistry, Multidisciplinary
Victor V. Maltsev, Elena A. Volkova, Elizaveta V. Koporulina, Diana D. Mitina, Vladimir L. Kosorukov, Anna I. Jiliaeva, Daniil A. Naprasnikov, Konstantin N. Gorbachenya, Viktor E. Kisel
Summary: The phase relationships, crystal properties and luminescence kinetics of two complex systems were studied, including unit cell parameters, segregation coefficients of impurities, and lifetimes of energy levels.
Article
Chemistry, Multidisciplinary
Xiaoman Zhang, Wangwang Xu, W. J. Meng, Andrew C. Meng
Summary: This study successfully grew high-quality single crystal AlScN nanowires through ultra-high vacuum reactive sputtering technique and characterized their structure and properties. The nanowires exhibit significantly reduced mosaic spread and predominantly single ferroelectric domains, as well as a high piezoelectric constant.
Article
Chemistry, Multidisciplinary
Tom E. de Vries, Elias Vlieg, Rene de Gelder
Summary: Networks are important for describing relationships between people, roads between cities, reactions between chemicals, and other interactions. Bipartiteness, dividing the network into two groups, can facilitate the study of the network's structure. We have developed an algorithm that can find a near-optimal bipartisation within a reasonable time frame and used it to uncover the hidden structure of the CSD cocrystal network.
Article
Chemistry, Multidisciplinary
Chuchu Han, Jing Yang, Xin Zhang, Aisen Li, Jiang Peng
Summary: An elastic crystal based on a photo-reactive acylhydrazone derivative is reported, which exhibits reversible bending behavior under UV irradiation and heating. The crystal undergoes reversible E<->Z isomerization under light and heating conditions. The crystal demonstrates excellent elastic properties and the bending can be controlled to control the output direction of red light.
Article
Chemistry, Multidisciplinary
Lingfeng Zhang, Yu Wang, Yefeng Wang, Shuai Liu, Na Zhang, Mingmin Yang, Haixia Ma, Zhaoqi Guo
Summary: This study designs and synthesizes a series of high-energy salts compounds without heavy metal ions and azide groups. The molecular structures and stability of the compounds are confirmed through single-crystal X-ray diffraction and intermolecular interaction analysis. Furthermore, the thermal stability, energetic properties, and electrical initiation properties of the compounds are investigated, suggesting their potential as primary explosives.