http://ir.imr.ac.cn:80 中国科学院金属研究所 Wed, 22 Apr 2026 11:00:47 GMT 2026-04-22T11:00:47Z http://ir.imr.ac.cn:80/handle/321006/192149 Title: Mo₂C Supported by Oxidized Carbon Nanotubes for Reinforcing Epoxy Composite Authors: Wang, Qi; Xiao, Pengfei; Liu, Yaqing; Zeng, You; Zhong, Bingwei Description: It is crucial to weaken the influence of sacrificing the mechanical properties of epoxy matrices by enhancing the efficiency of flame retardants. Herein, we utilized oxidized carbon nanotube (oCNT) as a dual-functional component, serving as both carbon sources and supports for Mo2C nanoparticles, and effectively modified N species to oCNT, improved the dispersion of Mo2C, and combined Mo2C with oCNT simultaneously. The physical and chemical properties of the resulting Mo2C@oCNT were characterized. Remarkably, the incorporation of merely 0.18 wt % Mo2C in the epoxy composite yielded simultaneous and significant improvements in mechanical and flame-retardant properties. The composite exhibited substantial enhancements in key mechanical parameters, with tensile strength, impact strength, and storage modulus increasing by 6.5, 38.1, and 10.5%, respectively. Concurrently, the flame retardancy performance showed marked improvement, as evidenced by a 12% increase in the limiting oxygen index, an 8.6% extension in time to peak heat release rate, and a 52.5% elevation in char yield. Furthermore, critical fire safety parameters demonstrated significant reduction, with the peak heat release rate, total heat release, and total smoke production decreasing by 19.2, 10.2, and 12.7%, respectively. Mo2C@oCNT/epoxy nanocomposite exhibited the lowest fire growth rate value of 5.05 kW<middle dot>m(-2)<middle dot>s(-1). The enhanced mechanical performance was attributed to the strong and extensive interfacial interactions that facilitated efficient stress transfer from the epoxy matrix to the strong Mo2C@oCNT. The superior catalytic dehydrogenation performance of Mo2C contributed to carbonization and forming protective chars during combustion, leading to enhanced flame retardant performances of Mo2C@oCNT/epoxy nanocomposite. This work presents a promising strategy for developing high-performance epoxy nanocomposites with balanced mechanical and flame-retardant properties through rational nanohybrid design. Sun, 27 Apr 2025 03:50:17 GMT http://ir.imr.ac.cn:80/handle/321006/192149 2025-04-27T03:50:17Z http://ir.imr.ac.cn:80/handle/321006/192145 Title: Microstructure and mechanical properties of nano TiB whisker-reinforced titanium matrix composites using atomized Ti-TiB composite powder as raw materials Authors: Liu, Lei; Li, Shufeng; Li, Shaolong; Liu, Huiying; Wang, Shaodi; Hui, Dongxu; Zhang, Xin; Kariya, Shota; Issariyapat, Ammarueda; Umeda, Junko; Kondoh, Katsuyoshi; Xiao, Bolv; Ma, Zongyi Description: In situ formed TiB-reinforced titanium matrix composites (TMCs) have gained significant attention for their high specific modulus and strength. However, the high sintering temperatures required for in situ reactions and densification can cause rapid coarsening of TiB whiskers, limiting the improvements in mechanical properties. This study proposes a "low-temperature sintering + hot extrusion" method to prepare nano TiB-reinforced Ti-TiB composites. The process involves low-temperature sintering at 800 degrees C-below the HCP-Ti phase transformation temperature-followed by hot extrusion for densification. The resulting Ti-TiB composites feature TiB with diameters of approximately 123 nm. The yield strength (YS) and ultimate tensile strength (UTS) of the nano TiBreinforced Ti-TiB composites reach 632 MPa and 833 MPa, respectively, reflecting increases of 70 % and 51 % compared to microscale TiB-reinforced Ti-TiB composites, while maintaining an elongation (El) of 13.97 %. The size evolution of TiB in the composites follows a temperature-dependent progression. Below 800 degrees C, TiB remains nanoscale, while temperatures above 800 degrees C, TiB grows to the microscale. The failure mode also shifts with TiB size, from interfacial debonding at the microscale to load-bearing fracture at the nanoscale. Additionally, the refinement of matrix grains and the obstruction of dislocations by nanoscale TiB further improve mechanical properties. This work opens a new controllable and facile route for preparing nano TiB-reinforced titanium matrix composites with promising properties. Sun, 27 Apr 2025 03:50:15 GMT http://ir.imr.ac.cn:80/handle/321006/192145 2025-04-27T03:50:15Z http://ir.imr.ac.cn:80/handle/321006/192141 Title: Microstructure and mechanical properties of nano TiB whisker-reinforced titanium matrix composites using atomized Ti-TiB composite powder as raw materials Authors: Liu, Lei; Li, Shufeng; Li, Shaolong; Liu, Huiying; Wang, Shaodi; Hui, Dongxu; Zhang, Xin; Kariya, Shota; Issariyapat, Ammarueda; Umeda, Junko; Kondoh, Katsuyoshi; Xiao, Bolv; Ma, Zongyi Description: In situ formed TiB-reinforced titanium matrix composites (TMCs) have gained significant attention for their high specific modulus and strength. However, the high sintering temperatures required for in situ reactions and densification can cause rapid coarsening of TiB whiskers, limiting the improvements in mechanical properties. This study proposes a "low-temperature sintering + hot extrusion" method to prepare nano TiB-reinforced Ti-TiB composites. The process involves low-temperature sintering at 800 degrees C-below the HCP-Ti phase transformation temperature-followed by hot extrusion for densification. The resulting Ti-TiB composites feature TiB with diameters of approximately 123 nm. The yield strength (YS) and ultimate tensile strength (UTS) of the nano TiBreinforced Ti-TiB composites reach 632 MPa and 833 MPa, respectively, reflecting increases of 70 % and 51 % compared to microscale TiB-reinforced Ti-TiB composites, while maintaining an elongation (El) of 13.97 %. The size evolution of TiB in the composites follows a temperature-dependent progression. Below 800 degrees C, TiB remains nanoscale, while temperatures above 800 degrees C, TiB grows to the microscale. The failure mode also shifts with TiB size, from interfacial debonding at the microscale to load-bearing fracture at the nanoscale. Additionally, the refinement of matrix grains and the obstruction of dislocations by nanoscale TiB further improve mechanical properties. This work opens a new controllable and facile route for preparing nano TiB-reinforced titanium matrix composites with promising properties. Sun, 27 Apr 2025 03:50:14 GMT http://ir.imr.ac.cn:80/handle/321006/192141 2025-04-27T03:50:14Z http://ir.imr.ac.cn:80/handle/321006/192137 Title: Effect of low-energy pulse current on the microstructure and properties of a Ni-based superalloy Authors: Ma, Jinchao; Guo, Jingdong; Liu, Jide; Luo, Xinyi; Zhang, Zhipeng; Zhang, Tao; Yan, Jiacheng; Zhang, Mingkui; Cui, Chuanyong; Zhang, Xinfang; Zhou, Yizhou; Li, Jinguo Description: This study proposes a low-energy pulse current (LEPC) rapid solution treatment method, which can dissolve more primary gamma' phase in a shorter time and effectively suppress abnormal grain growth, thereby successfully achieving microstructure optimization and property enhancement. The microstructure analysis showed that, compared with the 62.5 % dissolution rate of the standard traditional solution treatment (1100 degrees C/4 h), LEPC achieved an 88.9 % dissolution of the primary gamma' phase in just 5 min at the same temperature. Furthermore, due to the rapidity of the LEPC treatment and its "targeted dissolution effect" on the gamma' phase, excessive grain growth was effectively suppressed, resulting ingrain size comparable to those obtained with traditional solution treatment. Mechanical property testing indicated that the alloy treated with LEPC had a hardness of 531 HV at room temperature, while the yield strength, Ultimate strength, and maximum strain reached 994 MPa, 1030 MPa, and 5.1 % at the service temperature (750 degrees C). Compared to the standard traditional solution treatment, these properties were improved by 10.4 %, 11.1 %, 10.4 %, and 17.5 %, respectively. Finally, theoretical calculations revealed that the non- thermal effect of LEPC reduced the dissolution-free energy by approximately 49.4 kJ/mol and increased the diffusion coefficient by about 76 times, which was the fundamental reason for the accelerated dissolution of the primary gamma' phase. (c) 2025 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology. Sun, 27 Apr 2025 03:50:11 GMT http://ir.imr.ac.cn:80/handle/321006/192137 2025-04-27T03:50:11Z http://ir.imr.ac.cn:80/handle/321006/192136 Title: NIR-triggering cobalt single-atom enzyme switches off-to-on for boosting the interactive dynamic effects of multimodal phototherapy Authors: Dai, Hao; Han, Ali; Wang, Xijun; Zhu, Peng; Wang, Dingsheng; Wang, Yuguang Description: Noninvasive phototherapy with functional preservation is considered to be a promising cancer therapeutic method. However, the clinical application of tumor phototherapy is severely restrained by the lack of appropriate multimodal phototherapy agents exhibiting an ideal tissue penetration depth to maximize the antitumor efficiency as well as to maintain important tissue functions. Herein, an innovative near-infrared ray (NIR)-triggered photodynamic-photocatalytic-photothermal therapy (PDT-PCT-PTT) agent based on an atomically dispersed cobalt single-atom enzyme (Co-SAE) anchored on hollow N-doped carbon sphere (HNCS) has been strategically developed. Reactive oxygen species (ROS) are highly activated and amplified through both the photogenerated electrons and the photothermal conversion induced by NIR irradiation, as systematically demonstrated by the experimental and density functional theory (DFT) calculation results. Mild hyperthermia is eventually achieved through apoptosis and ferroptosis caused by ROS, significantly boosting the interaction of ROS dynamic effects and thermodynamic effects in the tumor microenvironment (TME). More importantly, Co-SAEs/HNCS not only causes multimodal damage through limited TME products but also preserves important organ functions by the induction of mild local hyperthermia. This work expands the biomedical application field of SAEs and presents an innovative all-in-one, multimodal concept for the noninvasive treatment of head and neck cancer. Sun, 27 Apr 2025 03:50:11 GMT http://ir.imr.ac.cn:80/handle/321006/192136 2025-04-27T03:50:11Z http://ir.imr.ac.cn:80/handle/321006/192129 Title: NIR-triggering cobalt single-atom enzyme switches off-to-on for boosting the interactive dynamic effects of multimodal phototherapy Authors: Dai, Hao; Han, Ali; Wang, Xijun; Zhu, Peng; Wang, Dingsheng; Wang, Yuguang Description: Noninvasive phototherapy with functional preservation is considered to be a promising cancer therapeutic method. However, the clinical application of tumor phototherapy is severely restrained by the lack of appropriate multimodal phototherapy agents exhibiting an ideal tissue penetration depth to maximize the antitumor efficiency as well as to maintain important tissue functions. Herein, an innovative near-infrared ray (NIR)-triggered photodynamic-photocatalytic-photothermal therapy (PDT-PCT-PTT) agent based on an atomically dispersed cobalt single-atom enzyme (Co-SAE) anchored on hollow N-doped carbon sphere (HNCS) has been strategically developed. Reactive oxygen species (ROS) are highly activated and amplified through both the photogenerated electrons and the photothermal conversion induced by NIR irradiation, as systematically demonstrated by the experimental and density functional theory (DFT) calculation results. Mild hyperthermia is eventually achieved through apoptosis and ferroptosis caused by ROS, significantly boosting the interaction of ROS dynamic effects and thermodynamic effects in the tumor microenvironment (TME). More importantly, Co-SAEs/HNCS not only causes multimodal damage through limited TME products but also preserves important organ functions by the induction of mild local hyperthermia. This work expands the biomedical application field of SAEs and presents an innovative all-in-one, multimodal concept for the noninvasive treatment of head and neck cancer. Sun, 27 Apr 2025 03:50:10 GMT http://ir.imr.ac.cn:80/handle/321006/192129 2025-04-27T03:50:10Z http://ir.imr.ac.cn:80/handle/321006/192133 Title: NIR-triggering cobalt single-atom enzyme switches off-to-on for boosting the interactive dynamic effects of multimodal phototherapy Authors: Dai, Hao; Han, Ali; Wang, Xijun; Zhu, Peng; Wang, Dingsheng; Wang, Yuguang Description: Noninvasive phototherapy with functional preservation is considered to be a promising cancer therapeutic method. However, the clinical application of tumor phototherapy is severely restrained by the lack of appropriate multimodal phototherapy agents exhibiting an ideal tissue penetration depth to maximize the antitumor efficiency as well as to maintain important tissue functions. Herein, an innovative near-infrared ray (NIR)-triggered photodynamic-photocatalytic-photothermal therapy (PDT-PCT-PTT) agent based on an atomically dispersed cobalt single-atom enzyme (Co-SAE) anchored on hollow N-doped carbon sphere (HNCS) has been strategically developed. Reactive oxygen species (ROS) are highly activated and amplified through both the photogenerated electrons and the photothermal conversion induced by NIR irradiation, as systematically demonstrated by the experimental and density functional theory (DFT) calculation results. Mild hyperthermia is eventually achieved through apoptosis and ferroptosis caused by ROS, significantly boosting the interaction of ROS dynamic effects and thermodynamic effects in the tumor microenvironment (TME). More importantly, Co-SAEs/HNCS not only causes multimodal damage through limited TME products but also preserves important organ functions by the induction of mild local hyperthermia. This work expands the biomedical application field of SAEs and presents an innovative all-in-one, multimodal concept for the noninvasive treatment of head and neck cancer. Sun, 27 Apr 2025 03:50:10 GMT http://ir.imr.ac.cn:80/handle/321006/192133 2025-04-27T03:50:10Z http://ir.imr.ac.cn:80/handle/321006/192123 Title: Oxidation, hot corrosion, and interdiffusion behavior of NiAlTa coating by electro-spark deposition Authors: Yang, Shuai; Gao, Si-Yang; Xue, Wei-Hai; Wu, Bi; Duan, De-Li Description: A novel NiAlTa blade tip protective coating is designed and its oxidation, hot corrosion, and interdiffusion with DD5 single-crystal superalloys are investigated. NiAlTa coatings exhibit low oxidation rates. The dragging effect of Ta on Al hinders the external diffusion of Al. Ta that accumulates at the Al2O3 grain boundaries reduces the internal diffusion of O by combining or reacting with it. NaCl aggravates the hot corrosion through self ustaining cycles of chlorination/oxidation. beta-NiAl phase fails first as a diffusion channel for the corrosive medium. Significant element interdiffusion occurs. An interdiffusion zone and a secondary reaction zone are formed. Interdiffusion changes the percentage of elements, causing a phase transition of the coating. The volume change caused by the phase transition induces bulging and cracking of the oxide film. Furthermore, the oxidation, hot corrosion, and interdiffusion mechanisms are discussed. (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)NiAlTa(sic)(sic)(sic)(sic)(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)DD5(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic)(sic)(sic), NiAlTa(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).Ta(sic)Al(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)Al(sic)(sic)(sic)(sic).(sic)(sic), (sic)(sic)(sic)Al2O3(sic)(sic)(sic)(sic)Ta(sic)(sic)(sic)O(sic)(sic)(sic)(sic)(sic)(sic)O(sic)(sic)(sic)(sic).NaCl(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)/(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).beta-NiAl(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic).NiAlTa(sic)(sic)(sic)DD5(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)tau 1 - NiTaAl (sic)(sic)(sic)(sic).(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic), NiAlTa(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic). Sun, 27 Apr 2025 03:50:08 GMT http://ir.imr.ac.cn:80/handle/321006/192123 2025-04-27T03:50:08Z http://ir.imr.ac.cn:80/handle/321006/192121 Title: Oxidation, hot corrosion, and interdiffusion behavior of NiAlTa coating by electro-spark deposition Authors: Yang, Shuai; Gao, Si-Yang; Xue, Wei-Hai; Wu, Bi; Duan, De-Li Description: A novel NiAlTa blade tip protective coating is designed and its oxidation, hot corrosion, and interdiffusion with DD5 single-crystal superalloys are investigated. NiAlTa coatings exhibit low oxidation rates. The dragging effect of Ta on Al hinders the external diffusion of Al. Ta that accumulates at the Al2O3 grain boundaries reduces the internal diffusion of O by combining or reacting with it. NaCl aggravates the hot corrosion through self ustaining cycles of chlorination/oxidation. beta-NiAl phase fails first as a diffusion channel for the corrosive medium. Significant element interdiffusion occurs. An interdiffusion zone and a secondary reaction zone are formed. Interdiffusion changes the percentage of elements, causing a phase transition of the coating. The volume change caused by the phase transition induces bulging and cracking of the oxide film. Furthermore, the oxidation, hot corrosion, and interdiffusion mechanisms are discussed. (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)NiAlTa(sic)(sic)(sic)(sic)(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)DD5(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic)(sic)(sic), NiAlTa(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).Ta(sic)Al(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)Al(sic)(sic)(sic)(sic).(sic)(sic), (sic)(sic)(sic)Al2O3(sic)(sic)(sic)(sic)Ta(sic)(sic)(sic)O(sic)(sic)(sic)(sic)(sic)(sic)O(sic)(sic)(sic)(sic).NaCl(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)/(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).beta-NiAl(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic).NiAlTa(sic)(sic)(sic)DD5(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)tau 1 - NiTaAl (sic)(sic)(sic)(sic).(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic), NiAlTa(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic). Sun, 27 Apr 2025 03:50:07 GMT http://ir.imr.ac.cn:80/handle/321006/192121 2025-04-27T03:50:07Z http://ir.imr.ac.cn:80/handle/321006/192112 Title: Potential-dependent Cr/Mo ratio effect on the passivity of Fe-based metallic glass in simulated wet storage environment of spent nuclear fuels Authors: Huang, Ping; Wang, Debin; Cui, Jingping; Liu, Jiaqi; Zhang, Suode; Ren, Yinglei; Qiu, Keqiang; Wang, Jianqiang Description: The corrosion resistance of Fe-based metallic glasses (MGs) with different Cr/Mo ratios in simulated wet storage environment for spent nuclear fuels were systematically examined. Results reveal that the Cr/Mo ratio exhibits different effects on the corrosion resistance of the Fe-based MGs at different potentials. At low potential, the passive current density decreases gradually with the increment of Cr/Mo ratio. This is related to the enrichment of Cr oxides and the reduction of defects densities in the passive film, which inhibit the diffusion of Cl-and the dissolution of the film. Interestingly, at high potential, as the Cr/Mo ratio increases, the corrosion property of the Fe-based MGs enhances initially and then deteriorates, and Cr10Mo5 alloy demonstrates the best corrosion resistance. This is because at the appropriate Cr/Mo ratio, the potential can encourage the accumulation of Mo in passive films while also promote film thickening. This process enhances the electronic work function of the passive film, which contributes to the improved corrosion resistance. This research provides a new perspective for the designing corrosion-resistant Fe-based MGs for the wet storage of spent nuclear fuels. Sun, 27 Apr 2025 03:50:02 GMT http://ir.imr.ac.cn:80/handle/321006/192112 2025-04-27T03:50:02Z