Article
Engineering, Multidisciplinary
Songbin Zhang, Hailong Qin, Zhuang Li, Chong Wei, Cheng Zhang, Xiaoqiang Li
Summary: The damage process and mechanism of Mo-SiCf/SiC cladding is revealed, showing that micro-cracks originate from pores in the outermost side of the SiCf/SiC layer and propagate along fiber bundles boundaries. Bamboo joint-like damage occurs in the SiCf/SiC layer during C-ring test due to periodic pore distribution. Mo-SiCf/SiC cladding exhibits better crack growth resistance and higher strength compared to SiCf/SiC cladding.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Materials Science, Ceramics
Jianwei Sun, Qiang Jing, Liwen Lei, Jinyong Zhang
Summary: The residual stress distribution in different Si3N4/SiC functionally graded materials (FGM) formed during fabrication processes was investigated using X-ray diffraction method. It was found that the residual stress in FGMs with different component gradients was determined by the quadratic function of the component content and mainly influenced by the thermal mismatch and elastic modulus caused by the component content gradient. The maximum tensile strength of FGMs was limited by the ultimate tensile strength or shearing strength of SiC. Cracks formed when the maximum tensile strength exceeded the ultimate tensile strength or shearing strength of SiC, and the maximum residual stress was within the ultimate limit leading to a newly balanced stress distribution due to the same gradient function. These results provide insights for regulating the performance and designing the gradient of FGMs for specific applications.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Lei Han, Xiaojian Li, Faliang Li, Haijun Zhang, Xueyin Liu, Guangqiang Li, Quanli Jia, Shaowei Zhang
Summary: High strength SiC reinforced Si3N4 ceramics aerogels were fabricated using foam-gelcasting and catalytic reaction, exhibiting excellent thermal conductivity and specific strength. The additional reinforcement from SiC whiskers formed in the Si3N4 matrix enhanced the mechanical properties of the aerogels.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Christoph Riedl, Matthaeus Siebenhofer, Sergej Raznjevic, Andreas Ewald Bumberger, Zaoli Zhang, Andreas Limbeck, Alexander Karl Opitz, Markus Kubicek, Juergen Fleig
Summary: In this study, LSF electrodes were grown on different electrolyte substrates and their oxygen exchange reaction (OER) resistance was measured in real-time inside the PLD chamber. The results showed that the OER resistance of epitaxially grown LSF electrodes increased with film thickness and had a higher activation energy compared to polycrystalline LSF electrodes. HRTEM and XRD measurements revealed a contraction of the out-of-plane lattice parameter in the epitaxial LSF electrodes.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Dongyuan Zhai, Zhipei Lv, Yi Zhao, Jiwu Lu
Summary: A novel thermal oxidation method combining low oxygen partial pressure and high temperature oxidation is proposed to improve the characteristics of the Al2O3/4H-SiC-based MOS structure. The method effectively reduces trapped charge density in the oxide and at the gate dielectric/4H-SiC interface, leading to improved breakdown characteristics. The core reason for improvement is the reduced SiO2 layer thickness and lower SiCxOy component concentration.
MICROELECTRONIC ENGINEERING
(2021)
Article
Engineering, Environmental
Guanjie Zeng, Xin Li, Yanjing Wei, Tong Guo, Xiaozhong Huang, Xuelong Chen, Xiu-Zhi Tang
Summary: The synthesis of porous ceramic materials with in situ grown Si3N4 nanowires via a pyrolysis process significantly enhances mechanical performance and electromagnetic absorption capacity, leading to improved toughness and specific compressive strength of the composite foam. This composite ceramic material shows potential applications in aviation, aerospace, and other extreme environments due to its excellent electromagnetic wave absorption capability, enhanced mechanical properties, low density, and high thermal resistance.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Materials Science, Ceramics
Boxiang Yao, Shibo Li, Weiwei Zhang, Wenbo Yu, Yang Zhou, Shukai Fan, Guoping Bei
Summary: Ti2AlC exhibits self-healing ability under low oxygen partial pressure conditions, with decomposed TiCx healing the damages and restoring strength. This study is of great importance for prolonging the service life of key components in low oxygen partial pressure environments.
JOURNAL OF ADVANCED CERAMICS
(2022)
Article
Materials Science, Ceramics
Zhang Ye, Yao Dongxu, Zuo Kaihui, Xia Yongfeng, Yin Jinwei, Zeng Yuping
Summary: Si3N4-BN-SiC composites were successfully fabricated by combustion synthesis, and their composition, microstructure, and mechanical properties were investigated. The in-situ introduction of BN and SiC improved the mechanical properties of the composites. The mechanical properties of the composites can be improved by adjusting the B4C content.
JOURNAL OF INORGANIC MATERIALS
(2022)
Article
Materials Science, Ceramics
Yuhan Wang, Wen Liu, JingXia Guo, Mingliang Li, Bingbing Fan, Hailong Wang, Hongliang Xu, Hongxia Lu, Gang Shao, Rui Zhang, Linan An
Summary: This study successfully fabricated fully dense Si3N4/SiC nano-composites through the combination of polymer-derived ceramics method and spark plasma sintering technique. By incorporating aluminum into the precursor, the densification rate was improved, the degradation of Si3N4 phase was prevented, and excellent oxidation/corrosion resistance was achieved.
CERAMICS INTERNATIONAL
(2021)
Article
Metallurgy & Metallurgical Engineering
Guangming Cao, Xinyu Gao, Shuai Pan, Wenchao Shan, Hao Wang, Zhenyu Liu
Summary: This study investigated the cracking and healing behavior during oxide scale formation on high-carbon steel, finding a relationship between blistering and the state of the oxide scale based on surface morphology. The mechanism of crack expansion and healing was developed by monitoring the evolution of oxide scale morphologies during the blistering process.
ISIJ INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Zicheng Meng, Tae Woo Kim, Sung Min Lee, Kee Sung Lee
Summary: In this study, crack healing behavior of SiC-SiC ceramic matrix composite (CMC) samples prepared by different methods was investigated. It was found that cracks in CVI-prepared samples healed at 1500 degrees C, while those in LMI-prepared samples healed at a lower temperature of 1400 degrees C. The four-point bending test confirmed the healing in LMI-prepared samples at room temperature and 1200 degrees C.
JOURNAL OF THE KOREAN CERAMIC SOCIETY
(2021)
Article
Nanoscience & Nanotechnology
Minqing Wang, Jinhui Du, Qun Deng
Summary: Low oxygen partial pressure significantly affects the dwell fatigue crack growth rate of 718Plus alloy at high temperatures. The dominant mechanisms include oxygen-induced dynamic embrittlement and stress-accelerated grain boundary oxidation, with the type of oxide formed in the process directly related to oxygen partial pressure and oxidation time.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Mechanics
Jesbeer Kallungal, Laurent Chazeau, Jean-Marc Chenal, Jerome Adrien, Eric Maire, Claire Barres, Bernard Cantaloube, Patrick Heuillet, Fabien Wilde, Julian Moosmann, Timm Weitkamp
Summary: This paper presents a precise 3D quantification of damage evolution and crack initiation in peroxide crosslinked EPDM filled with metallic oxide particles and filler agglomerates using synchrotron radiation X-ray Tomography. Polymer debonding is observed at the poles of metallic oxide particles during stretching, while crack always originates from carbon black agglomerates. The crack initiation process involves cavity nucleation, cavity growth, and eventual fracture of the agglomerates.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Jianguo Zhang, Yufan Fu, Yongjing Yu, Xiao Chen, Junjie Zhang, Junfeng Xiao, Jianfeng Xu
Summary: In this research, in-situ laser-assisted diamond cutting was used to precisely machine RB-SiC. Raman spectroscopy was employed to identify 3C-SiC and 6H-SiC components in RB-SiC. The study revealed that cross slips and high-density stacking faults significantly enhance the plastic deformation of RB-SiC, and the dislocations at the 3C-SiC/6H-SiC interfaces result in lateral cracks propagating along the [111]//[0001] direction.
Article
Materials Science, Ceramics
Zhengwei Li, Zhiwu Xu, Boxu Ren, Jiuchun Yan
Summary: In this study, porous Si3N4 ceramics were successfully soldered using Sn9Zn2Al solder through sonocapillary and cavitation. The results showed that the solder could quickly wet the ceramics and form a tight bond. A geometric model was used to analyze the infiltration mechanism of the solder, showing that acoustic pressure played a key role in the wetting process. Additionally, the wetting mechanism of the solder to the ceramic was analyzed based on cavitation bubble dynamics calculation.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Ryutaro Fueki, Koji Takahashi, Mitsuru Handa
Article
Engineering, Mechanical
Koji Takahashi, Yuta Kogishi, Norihito Shibuya, Fumiaki Kumeno
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2020)
Article
Materials Science, Multidisciplinary
Yoshitomi Yamada, Eto Hirohito, Koji Takahashi
Article
Optics
Ryutaro Fueki, Koji Takahashi
Summary: The research found that laser peening significantly improves the fatigue strength and reliability of high strength steel welded joints. Even defects of limited depth can be rendered harmless through LP treatment. The key factor contributing to the improvement in fatigue limit is the introduction of compressive residual stress by LP.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Ki-Woo Nam, Kotoji Ando, Min-Heon Kim, Koji Takahashi
Summary: Research has determined key characteristics for high-strength steel equipment designed against fatigue limit using surface crack nondamaging technology, including the aspect ratio of surface cracks, the relationship between maximum harmless crack depth and maximum allowable crack depth, as well as the importance of nondestructive inspection in detecting crack depth.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Takehiro Ishii, Koji Takahashi
Summary: Surface defects have a negative impact on the fatigue limit of metals, as demonstrated in a study on high-strength spring steel specimens; Experimental results show that the fatigue limit decreases with an increase in slit depth; Predictions based on the modified El-Haddad model are in good agreement with the experimental data, proving the model's reliability in evaluating fatigue limits of high-strength steels containing small surface defects with different stress ratios.
Article
Engineering, Mechanical
Min-Heon Kim, Won-Gu Lee, Cheol-Su Kim, Koji Takahashi, Mitsuru Handa, Ki-Woo Nam
Summary: The study found that after needle peening on DNV F690 offshore structural steel, compressive residual stress can increase fatigue limit, especially effective for specimens with smaller crack sizes.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2021)
Article
Chemistry, Physical
Kazuya Saigusa, Joji Yamamoto, Koji Takahashi, Fumiaki Kumeno, Norihito Shibuya
Summary: This study aimed to improve the bending strength and reliability of ceramics using laser peening. LP without coating (LPwC) and with coating (LPC) were applied to silicon nitride (Si3N4) under various conditions. The results showed that the LPwC specimen had a greater surface roughness but introduced larger and deeper compressive residual stress, resulting in higher bending strength and less scatter compared with the non-LP and LPC specimens.
Article
Materials Science, Multidisciplinary
Shiori Tsuchiya, Koji Takahashi
Summary: This study investigates the effect of laser peening on the fatigue strength of additive-manufactured metals, and finds that laser peening can improve fatigue limit and render surface defects harmless.
Article
Materials Science, Multidisciplinary
Misato Nakamura, Koji Takahashi, Yuta Saito
Summary: The effects of shot peening and laser peening on the fatigue strength of additively manufactured aluminum alloy specimens were investigated. The results showed that both treatments significantly improved the fatigue strength and altered the surface roughness and waviness of the specimens. Fatigue cracks originated from defects and concave areas on the surface. Furthermore, the introduction of deep compressive residual stress by laser peening further increased the fatigue strength of the specimens.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Materials Science, Multidisciplinary
Toshiya Tsuji, Masashi Fujino, Koji Takahashi
Summary: This study investigates the effects of shot peening as a means of remanufacturing gears. Shot peening was used to render artificial defects harmless and increase the fatigue strength of carburized steel specimens. The results show that shot peening can effectively repair defects and improve the performance of gears as a remanufacturing method.
Article
Engineering, Mechanical
Yasuhiro Ashiba, Yuu Koizumi, Koji Takahashi, Akihiko Hirano, Tsuneo Takayamagi, Yoshizumi Fukuhara, Fuminori Iwamatsu
MECHANICAL ENGINEERING JOURNAL
(2020)
Proceedings Paper
Engineering, Mechanical
Y. Yamada, H. Eto, J. Konya, K. Takahashi
2018 INTERNATIONAL CONFERENCE ON MATERIAL STRENGTH AND APPLIED MECHANICS (MSAM 2018)
(2018)
Proceedings Paper
Engineering, Mechanical
K. Takahashi, T. Oki
2018 INTERNATIONAL CONFERENCE ON MATERIAL STRENGTH AND APPLIED MECHANICS (MSAM 2018)
(2018)
Article
Engineering, Multidisciplinary
Ryutaro Fueki, Koji Takahashi
INTERNATIONAL JOURNAL OF STRUCTURAL INTEGRITY
(2018)
Article
Nanoscience & Nanotechnology
Ahmad Mirzaei, Peter D. Hodgson, Xiang Ma, Vanessa K. Peterson, Ehsan Farabi, Gregory S. Rohrer, Hossein Beladi
Summary: This study investigated the influence of parent austenite grain refinement on the intervariant boundary network in a lath martensitic steel. It found that refining the parent austenite grain led to a decrease in the fraction of certain boundaries in the martensite and an increase in the connectivity of low energy boundaries, ultimately improving the impact toughness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
N. L. Church, C. E. P. Talbot, L. D. Connor, S. Michalik, N. G. Jones
Summary: Metastable beta Ti alloys based on the Ti-Nb system have attracted attention due to their unique properties. However, the unstable cyclic behavior of these alloys has hindered their widespread industrial use. Recent studies have shown that internal stresses, including those from dislocations, may be responsible for this behavior. This study demonstrates that inter-cycle thermal treatments can mitigate the unstable cyclic behavior, providing a significant breakthrough in our understanding of Ti-Nb superelastic materials.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Di Zhao, Chenchen Zhao, Ziyang Xiu, Jiuchun Yan
Summary: This study proposes a novel strategy for achieving the bonding of SiC ceramic and Al alloy using ultrasound. The ultrasound promotes the dissolution of Al into the solder, activating the solder and triggering the interfacial reaction between SiC ceramic and solder. With increasing ultrasonic duration, the bonding between SiC and Al transitions from partial to full metallurgical bonding.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Kang Du, Yang Zhang, Guangda Zhao, Tao Huang, Liyuan Liu, Junpeng Li, Xiyu Wang, Zhongwu Zhang
Summary: This paper systematically investigated the evolution of microstructure in Fe-Ni-Co-Al polycrystalline alloys and its effects on mechanical properties. The results revealed that the migration of grain boundaries in different processes is driven by different factors, which impacts the grain orientation and precipitate formation. In the process of directional recrystallization, grains with specific orientations grow in the grain boundary region and form the dominant orientation, while grains with lower migration rate form the minor orientation. The alloy produced through directional recrystallization exhibited good recoverable strain and superelastic strain, while the alloy produced through solid solution treatment showed no evident superelastic behavior.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Edohamen Awannegbe, Liang Chen, Yue Zhao, Zhijun Qiu, Huijun Li
Summary: This study employed laser metal deposition to additively manufacture Ti-15Mo wt% alloy, and subsequently subjected it to post-fabrication uniaxial thermomechanical processing. The results showed that different zones in the microstructure remained after processing, and deformation mechanisms mainly involved slip and martensite formation. The compressive mechanical properties were found to be dependent on strain rate, with higher flow stress and compressive strength observed at higher strain rates. Grain structure homogenisation was not achieved, leading to anisotropic tensile properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Reza Khatib Zadeh Davani, Enyinnaya George Ohaeri, Sandeep Yadav, Jerzy A. Szpunar, Jing Su, Michael Gaudet, Muhammad Rashid, Muhammad Arafin
Summary: This research aims to investigate the effect of roughing and finishing reductions on crystallographic texture. The results show significant heterogeneity in the centerline region, with higher intensity of certain textures. Drop Weight Tear Test indicates that steel specimens with lower and medium reductions exhibit superior low-temperature impact toughness compared to steel with higher reductions. The electrochemical hydrogen charging experiments confirm the presence of internal hydrogen cracks only in steel with lower and medium reductions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Flavio De Barbieri, Denis Jorge-Badiola, Rodrigo Allende, Karem Tello, Alfredo Artigas, Franco Perazzo, Henry Jami, Juan Perez Ipina
Summary: This study examines the effect of Cr additions on the mechanical behavior of TWIP steel at temperatures ranging from 25°C to 350°C. The results indicate that different temperature-dependent strengthening mechanisms, including mechanical twinning, Dynamic Strain Aging, and slip bands, are at play. The stacking fault energy (SFE) influences the percentage of mechanical twinning, which in turn affects the strain hardening rate.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Hanlin Peng, Siming Huang, Ling Hu, Bingbing Luo, Liejun Li, Ian Baker
Summary: This study explores the weldability, microstructures, and mechanical properties of two L1(2)-nanoparticle-strengthened medium-entropy alloys after electron beam welding (EBW). The results show that strong yet ductile defect-free joints were produced, with larger grain sizes in the fusion zones compared to the heat-affected zones and base materials. Both EBWed MEAs exhibited high yield strengths, high ultimate tensile strengths, and good fracture strains at 77 K. The V-doping improved the cryogenic mechanical properties of the TMT MEA.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yongxin Wang, Lei Chen, Lizi Shao, Shuo Hao, Motomichi Koyama, Xingzhou Cai, Xiaocong Ma, Miao Jin
Summary: This study investigated the tensile deformation behavior of an Mn-N bearing lean duplex stainless steel with metastable austenite. The results showed that the strain rate had significant influence on the work hardening, strain-induced martensitic transformation, and fracture mechanism.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Jong Woo Won, Seulbi Lee, Hye-Jeong Choe, Yong-Taek Hyun, Dong Won Lee, Jeong Hun Lee
Summary: Cold-rolled pure titanium showed improved sheet formability after undergoing cryogenic-deformation treatment. This treatment increased the thinning capability of the titanium and suppressed cracking during sheet forming. The formation of twins during deformation contributed to high thinning capability and increased strength through grain refinement and dislocation accumulation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Handong Li, Lin Su, Lijuan Wang, Yanbin Jiang, Jiahui Long, Gaoyong Lin, Zhu Xiao, Yanlin Jia, Zhou Li
Summary: Homogenization heat treatment is a key procedure in controlling the second phase, enhancing composition uniformity, and workability of as-cast Cu-15Ni-8Sn alloy. This study found that electropulsing treatment (EPT) can significantly reduce treatment temperature and time, improve elongation and overall mechanical properties of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yuxuan Wang, Juntao Zou, Lixing Sun, Yunfei Bai, Zhe Zhang, Junsheng Cheng, Lin Shi, Dazhuo Song, Yihui Jiang, Zhiwei Zhang
Summary: A novel mechanical-heat-electricity synergistic method was proposed to enhance the mechanical properties of Cu-15Sn-0.3Ti alloy by forming annealing twins (ATs). The combination method of Rotary swaging (RS) and Electric pulse treatment (EPT) successfully induced recrystallization and refinement of the microstructure, leading to a significant increase in the strength of the alloy within a short time.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Zhiyi Ding, Jiangtao Xie, Tong Wang, Aiying Chen, Bin Gan, Jinchao Song
Summary: This study demonstrated the Ta-induced strengthening of CoCrNi-AlTi MEAs using nanoscale heterogeneous coherent precipitates. The addition of Ta and aging treatments significantly enhanced the mechanical properties of the alloy, including yield strength, ultimate tensile strength, and elongation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Z. Y. You, Z. Y. Tang, B. Wang, H. W. Zhang, P. Li, L. Zhao, F. B. Chu, H. Ding
Summary: The mechanical properties and microstructural evolution of C-doped TRIP-assisted HEA under dynamic loading conditions were systematically investigated in this study. The results showed that dynamic tensile deformation led to an increase in yield strength and a decrease in ultimate tensile strength, with a trend towards increased total elongation. The primary deformation mechanisms shifted from TRIP and TWIP effects to deformation twinning and dislocations. The presence of carbides formed through C-doping hindered dislocation slip and promoted the activation of multiple twinning systems.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Feng Qin, Feihu Chen, Junhua Hou, Wenjun Lu, Shaohua Chen, Jianjun Li
Summary: Plastic instability in strong multilayered composites is completely suppressed by architecting nanoscale BCC Nb crystalline-amorphous CuNb interfaces.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
