Article
Nanoscience & Nanotechnology
Hao Zhang, Xiubing Liang, Yongle Hu, Peng Zhang, Lingwei Yang, Dongyu He, Manyu Hua, Yonggang Tong
Summary: This study investigated the correlation of C/C preform density with the microstructure and mechanical properties of C/C-ZrC composites, revealing that the composite density decreased with increasing preform density and the flexural strength initially increased and then decreased with preform density. The highest flexural strength of 241 MPa was achieved at a C/C preform density of 1.28 g/cm(3).
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Running Wang, Ni Li, Jiaping Zhang, Bing Liu, Ningning Yan, Qiangang Fu
Summary: In this study, sharp leading-edge C/C-ZrC-SiC composites with different curvature radii were prepared by reactive melt infiltration, and their ablation behaviors were investigated. It was found that the linear change rates decreased as the radius increased. Samples with smaller radius suffered from more severe ablation at higher temperatures, which can be attributed to the increase in thermal stress, gas erosion, and the decrease of oxide layer stability.
Article
Materials Science, Ceramics
Yan Jia, Yong Li, Haifeng Cheng, Si'an Chen
Summary: In this study, the matrices of C/C-ZrC composites were modified by slurry infiltration to improve their density and properties. Different slurry powders were used to densify the composites. The density of the composites increased, while the porosity decreased after infiltration. The ablation and mechanical properties of the composites improved significantly by matrix modification.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Zhigang Zhao, Kezhi Li, Gang Kou, Wei Li
Summary: The cyclic and single ablation behaviors of C/C-ZrC-SiC and C/C-ZrC composites prepared by reactive melt infiltration were studied. It was found that the C/C-ZrC-SiC composites showed better ablation resistance under cyclic ablation mode compared to C/C-ZrC composites. The formation of an effective heat/oxygen protection layer on the ablated surface contributed to the desirable ablation resistance of C/C-ZrC-SiC composites during single ablation.
Article
Materials Science, Multidisciplinary
Zhigang Zhao, Kezhi Li, Gang Kou, Wei Li
Summary: The cyclic and single ablation behavior of C/C-ZrC-SiC and C/C-ZrC composites, prepared by reactive melt infiltration, were investigated. It was found that the increased cyclic ablation numbers aggravated the oxidation of the matrix and the peeling content of oxides. Under the cyclic ablation mode, C/C-ZrC-SiC composites exhibited better resistance to mass loss compared to C/C-ZrC composites. Moreover, at a single ablation duration of 240 s, C/C-ZrC-SiC composites demonstrated desirable ablation resistance due to the formation of an effective heat/oxygen protection layer.
Article
Materials Science, Ceramics
Tianyu Liu, Qiangang Fu, Jiaping Zhang
Summary: The C/C-ZrC composites were prepared using ICVI and RMI methods. Ablation behavior of the composites was studied under oxyacetylene flame. The results showed that with increased ablation time, the ablation rates increased initially and then stabilized, while the flexural strength and modulus of the composites significantly increased after 15 seconds of ablation.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Zhigang Zhao, Kezhi Li, Wei Li, Leilei Zhang
Summary: The study found that at lower heat fluxes, the surface temperature of cyclic ablation following 30s x 4 cycles was lower than that of 60s x 2 cycles. Microstructure characterization revealed a layered structure of the center and transition region.
Article
Materials Science, Multidisciplinary
Rida Zhao, Shengyang Pang, Bing Liang, Jian Li, Chenglong Hu, Sufang Tang, Hui-Ming Cheng
Summary: The ablation behaviors of C/SiC-ZrC and C/SiC-HfC composites were investigated, revealing differences in the ablation rates and the impact of the formed oxide products on the ablation resistance at different temperatures.
Article
Materials Science, Multidisciplinary
Zhiqiang Liu, Qiangang Fu, Huilun Shi, Jiaping Zhang, Yujun Jia
Summary: C/C-SiC-HfC composites were prepared using reactive melt infiltration (RMI) with different pressure conditions. The distribution of SiC and HfC ceramics can be regulated by adjusting the RMI pressure, resulting in different surface compositions. The composites prepared under normal pressure exhibited better ablation performance with the formation of a HfSi2-HfC-SiC mixed layer. The presence of HfSi2 improved the densification of HfO2 film, enhancing the ablation resistance.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Ceramics
Yuzhu Shen, Wei Sun, Yonglong Xu, Hongbo Zhang, Xiang Xiong
Summary: YF3 modified C/C-ZrC-SiC composites were prepared using molten salt assisted reactive melt infiltration, and the infiltration mechanism and ablative behavior were discussed. YF3 effectively seals existing pores and cracks in C/C-ZrC-SiC material. During ablation, YF3 modified composites form yttrium oxide stabilized zirconia, resulting in reduced mass ablation rate and linear ablation rate.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Xin Zhang, Qinchuan He, Mingcong Qing, Jie Feng, Zhanpeng Liu, Yiqun Wang, Xuemin Yin
Summary: La2O3 modified C/C-ZrC composites were successfully prepared by precursor infiltration and pyrolysis technique. The ablation resistance of the composites was tested at 1700 and 2400 degrees C in plasma flame. At 2400 degrees C, La2O3 promoted the liquid phase sintering of ZrO2, forming a protective La-Zr-O molten layer. At 1700 degrees C, La2O3 promoted the solid phase sintering of ZrO2, forming an intact La-Zr-O particle-stacked layer, which positively protected the composites.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Sijie Kou, Jingchao Ma, Yujie Ma, Yinghao Liu, Chenghua Luan, Shaobo Yang, Shangwu Fan, Juanli Deng, Peng Wang
Summary: C/HfC-ZrC-SiC composites were fabricated using reactive melt infiltration (RMI) of mixed HfSi2 and ZrSi2 alloys. The microstructure, infiltration behavior, and flexural strength of the composites were studied. The composites exhibited compositional segregation, with different phases distributed in the exterior and interior regions. A model for the reactive melt infiltration process was established, and the C/HfC-ZrC-SiC composites showed higher flexural strength compared to other composites prepared by the same process.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Yuanqi Weng, Xin Yang, Feixiong Chen, Xiaxiang Zhang, Anhong Shi, Junyi Yan, Qizhong Huang
Summary: C/C-ZrC-ZrxCuy composites were fabricated using the PARMI process, yielding a matrix with three different ZrC-ZrxCuy regions and sequentially decreasing ZrC particle sizes. The heat-absorbing effect of the Cu phase slowed down surface temperature increase during 30 seconds of ablation. After 60 seconds of ablation, the porous ZrO2 skeleton transformed into a protective integrated cover, reducing the ablation rates of the composites significantly.
Article
Materials Science, Ceramics
Rida Zhao, Shengyang Pang, Chenglong Hu, Jian Li, Bin Liang, Sufang Tang, Hui-Ming Cheng
Summary: RMI-C/SiC composites fabricated using a carbon fiber reinforced nanoporous carbon matrix preform demonstrate high performance with dense and pure SiC matrix and intact carbon fibers. In contrast, composites based on conventional pyrocarbon or resin carbon matrixes show poorer properties with less SiC, residual silicon and carbon, and corroded fibers. This work opens up a new way for the development of high-performance ceramic matrix composites by siliconizing C/C preforms with nanoporous carbon matrix.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Haijun Zhang, Lei Liu, Wei Feng, Yongchun Guo, Qinxin Han, Chengwei Tang, Xinyu Wang, Yixin Xie
Summary: This article investigates the damage behavior and mechanism of aluminum addition on C/C-SiC composites in different ablation environments. The results show that composites with 40% wt Al exhibit better ablation resistance in cyclic ablation, while composites with 20% wt Al show excellent resistance in single ablation. This difference is attributed to the formation of more microcracks and the lower surface temperature in composites with 40% wt Al during cyclic ablation, as well as the protective oxide layer formed in composites with 20% wt Al during single ablation.
CERAMICS INTERNATIONAL
(2023)
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)