Article
Nanoscience & Nanotechnology
Zhilin Liu, Xiaoming Yuan, Shiliang Wang, Sha Liu, Hark Hoe Tan, Chennupati Jagadish
Summary: This study investigates the mechanical properties and fracture mechanisms of GaAs nanowires under tensile stress, revealing that they deform elastically overall until sudden brittle fracture at 3.79% strain. Experimental results show fracture strength and elastic modulus of 4.0 and 109.5 GPa, respectively, which are much smaller than previous compression-based reports.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Zibing An, Zhipeng Li, Jianfei Zhang, Ze Zhang, Shengcheng Mao, Xiaodong Han
Summary: This study conducted tensile experiments on Ni single-crystal samples with different TB orientations using an in situ tensile stage in a transmission electron microscope. The results revealed a significant influence of TB orientation on the ductility of the materials, with the perpendicular TB sample exhibiting the highest elongation.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Ceramics
Shanshan Xu, Ce Zheng, Yichun Bi, Qingping Mao, Hailong Qin, Xiaoqiang Li
Summary: SiC/SiC composites are promising materials for nuclear systems, and SiC fibers play a critical role in the performance of these composites. This study investigated the microstructural evolution of Cansas-III SiC fibers under temperature effects using in-situ transmission electron microscopy. The results showed that at room temperature, the SiC fibers experienced heterogeneous amorphization and became completely amorphous at a certain dose. At temperatures above the critical temperature for crystalline-to-amorphous transition, the fibers underwent carbon packet disappearance and nano-grain growth. Possible mechanisms were discussed.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
J. P. Goulmy, D. Depriester, F. Guittonneau, L. Barrallier, S. Jegou
Summary: Understanding the mechanisms at the microstructure scale is crucial for modeling material behavior. This study explores the use of high resolution digital image correlation (HRDIC) combined with in situ Scanning Electron Microscope (SEM) tests to establish a connection between polycrystalline modeling and experiment. The tensile behavior of a pure copper polycrystal is evaluated using HRDIC, and the impact of grain orientation on mechanical behavior is discussed through EBSD analysis.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Ceramics
Tao Li, Yulei Zhang, Jian Zhang, Yanqin Fu, Jie Li
Summary: A SiO2-SiC reticulated layer with SiC nanowires was pre-prepared on C/C composites to improve oxidation resistance and alleviate siliconization erosion during SiC coating preparation, resulting in a compact and homogeneous SiC coating.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Physical
Dongliang Ding, Shiyu Zhang, Haoyu Liang, Xu Wang, Ya Wu, Yuanming Ye, Zhenguo Liu, Qiuyu Zhang, Guangzhao Qin, Yanhui Chen
Summary: This study reports a novel method to prepare highly through-plane thermally conductive silicone rubber composites with vertically aligned silicon carbide fibers and nanowires network. The composites achieved a high through-plane thermal conductivity of 2.13 W/(m.K) at 15% filler loading, with good electrical insulation performance and dimensional stability.
Article
Chemistry, Multidisciplinary
Minxing Xu, Dongil Shin, Paolo M. Sberna, Roald van der Kolk, Andrea Cupertino, Miguel A. Bessa, Richard A. Norte
Summary: This study uncovers a nanoscale amorphous silicon carbide material with the highest ultimate tensile strength ever measured for a nanostructured amorphous material. It demonstrates the fabrication of high-aspect-ratio silicon carbide strings with outstanding mechanical performance. The robust thin-film material has significant potential for applications in nanomechanical sensors, solar cells, biological applications, space exploration, and other areas requiring strength and stability in dynamic environments.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Zhe Chen, Chris Torbet, John Allison
Summary: This study introduces an approach for identifying deformation twinning and twin variants from EBSD data collected at multiple load steps during in situ cyclic loading of a Mg-4Al alloy. The method involves spatial transformation, alignment, and comparison of EBSD maps of different load steps to ensure consistent grain definition. It determines the parent orientation at different load steps and identifies twins by comparing the child grain orientation with each possible twin variant orientation of the parent grain. The methodology allows for visualizing the twin evolution history during cyclic loading.
Article
Green & Sustainable Science & Technology
Zheng Zuo, Xiuqiang Hao, Huiqiang Li, Wei Wang, Guangqing Yang, Ying Liu
Summary: This paper investigates the tensile mechanical behavior of HDPE geocell strips through a series of tensile tests and trapezoidal tests. The effects of specimen shape, specimen width, and welding junction on the mechanical behavior are studied. The results show that the tensile strength is less affected by the specimen shape and width, but the elongation is sensitive to the shape. The welding junction also has a significant impact on the strip's strength retention rate. The trapezoidal test results are comparable to the tensile test results.
Article
Materials Science, Multidisciplinary
Amrita Lall, Paul Bowen, Afsaneh Rabiei
Summary: This study evaluated the effect of specimen thickness on tensile test results, comparing in-situ SEM tests on submillimeter thick samples with ex-situ tests on thicker samples. Results showed differences in necking mechanism and failure modes for thinner and thicker samples. FEM simulations confirmed the validity of in-situ SEM tests on thinner samples as long as the minimum required number of grains existed within the cross-section.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Subing Yang, Yuki Nakagawa, Minako Kondo, Tamaki Shibayama
Summary: Anisotropic swelling in hexagonal alpha-SiC induced by irradiation was found to degrade the mechanical properties of the material. By introducing an anisotropic swelling condition in 4H-SiC using selected-area He+ irradiation, researchers observed an anisotropic distribution of defects which could potentially enhance the understanding of SiC's mechanical properties.
Article
Materials Science, Multidisciplinary
E. Aradi, J. Lewis-Fell, G. Greaves, S. E. Donnelly, J. A. Hinks
Summary: By using in-situ transmission electron microscopy and ion irradiation, microstructural changes in silicon carbide nanowhiskers were investigated. It was found that the nanowhiskers exhibited higher radiation tolerance compared to thin foils, but elemental segregation and precipitation may limit its application in advanced nuclear reactors.
Article
Materials Science, Ceramics
Pengcheng Jiang, Zhoufu Wang, Hao Liu, Yan Ma, Yulong Wang, Jiwei Niu, Hongxing Pang, Xitang Wang
Summary: SiC/SiO2 nanowires were synthesized via chemical vapor deposition with a chain-bead structure, catalyzed by copper citrate. These nanowires enhanced the mechanical and oxidation resistance properties of PF pyrolysis carbons.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
B. K. Afornu, A. M. Lider, O. A. Ismail, E. B. Agyekum
Summary: The study revealed that SiC/Zr-1Nb sintered in air atmosphere demonstrated better scratch adhesion and tribological properties compared to samples sintered in Ar atmosphere. Additionally, SiC coated in air atmosphere showed superior wear resistance, with an increase in mean friction coefficient.
Article
Materials Science, Ceramics
Kazuya Shimoda, Christian Colin
Summary: The in situ thermal stability of SiC-based ceramic fibers was investigated, and the third-generation fibers showed excellent stability at temperatures up to 1800 degrees C.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
