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学者姓名：宋晓艳
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摘要 ：
In this work, the microstructural characteristics and tribological properties of HVOF-sprayed WC-TiC-Co coatings with varying amounts of TiC addition were studied, along with a comparison with those of the traditional WC-Co coating. The incorporated TiC exhibited a diverse presence in the coatings, including (Ti,W)C solid solution particles and interfacial layers, residual TiC particles, as well as Ti-monolayer that induced planar defects within WC grains. The high stability of (Ti,W)C layers at the WC/Co interfaces effectively suppressed the formation of W2C in the WC-TiC-Co coatings. Notably, the coating with 10 wt% TiC demonstrated superior wear resistance owing to the hardening effects of (Ti,W)C particles and interfacial layers. This effectively mitigated the wear mechanisms such as plastic deformation, extrusion, and micro-cutting of the Co binder, which would otherwise lead to the pull-out of WC particles and accelerate the wear process. These findings provide valuable insights into the microstructure design and performance optimization of WC-based coatings.
关键词 ：
Wear resistance Wear resistance WC-TiC-co coating WC-TiC-co coating HVOF spraying HVOF spraying W)C solid solution W)C solid solution (Ti (Ti
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| GB/T 7714 | Wang, Chen , Wang, Haibin , Zhao, Zhi et al. Microstructural characteristics and wear-resistant mechanisms of WC-TiC-co coatings with varying TiC contents [J]. | INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS , 2024 , 122 . |
| MLA | Wang, Chen et al. "Microstructural characteristics and wear-resistant mechanisms of WC-TiC-co coatings with varying TiC contents" . | INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS 122 (2024) . |
| APA | Wang, Chen , Wang, Haibin , Zhao, Zhi , Liu, Chao , Lu, Hao , Liu, Xuemei et al. Microstructural characteristics and wear-resistant mechanisms of WC-TiC-co coatings with varying TiC contents . | INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS , 2024 , 122 . |
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摘要 ：
It is challenging to describe quantitatively the effects of ceramic grain morphology on the stress and strain distributions in the cermet materials under different loading conditions. Here the dependence of the distribution of residual thermal stress (RTS) in the as-prepared cermets and its mechanical behavior under external stress on the morphology of ceramic grains were quantified and resolved by modeling and experimental studies, using WC-Co cermets as a typical example. A model was proposed to visualize the strain localization and reveal the mechanisms of the initiation and propagation of micro-cracks in the microstructure of cermets under varying loads, and the calculation results were verified by experimental measurements. It was discovered that the effects of WC grain morphology on the mechanical behavior and failure mode of cermets are distinctly different under tension or compression loading conditions, whose mechanisms were disclosed based on detailed analysis of micro-scale strain responses. The results indicate that it is feasible to modulate the strain distribution by tailoring the grain shape character for adapting to external loading, hence optimizing the material mechanical behavior.
关键词 ：
Compression Compression Tension Tension Strain localization Strain localization Ceramic grain morphology Ceramic grain morphology Mechanical behavior Mechanical behavior
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| GB/T 7714 | Chen, Jinghong , Yang, Yulu , Lu, Hao et al. Mechanical behavior of cermets with different morphology of ceramic grains [J]. | ACTA MATERIALIA , 2024 , 266 . |
| MLA | Chen, Jinghong et al. "Mechanical behavior of cermets with different morphology of ceramic grains" . | ACTA MATERIALIA 266 (2024) . |
| APA | Chen, Jinghong , Yang, Yulu , Lu, Hao , Liu, Xuemei , Wang, Haibin , Song, Xiaoyan . Mechanical behavior of cermets with different morphology of ceramic grains . | ACTA MATERIALIA , 2024 , 266 . |
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摘要 ：
Simultaneous improvement of strength and conductivity is urgently demanded but challenging for bimetallic materials. Here we show by creating a self-assembled lamellar (SAL) architecture in W-Cu system, enhancement in strength and electrical conductivity is able to be achieved at the same time. The SAL architecture features alternately stacked Cu layers and W lamellae containing high-density dislocations. This unique layout not only enables predominant stress partitioning in the W phase, but also promotes hetero-deformation induced strengthening. In addition, the SAL architecture possesses strong crack-buffering effect and damage tolerance. Meanwhile, it provides continuous conducting channels for electrons and reduces interface scattering. As a result, a yield strength that doubles the value of the counterpart, an increased electrical conductivity, and a large plasticity were achieved simultaneously in the SAL W-Cu composite. This study proposes a flexible strategy of architecture design and an effective method for manufacturing bimetallic composites with excellent integrated properties. Simultaneous increase of mechanical and physical properties is highly desirable, but challenging for bimetallic materials. Here, the authors use W-Cu as an example to achieve both high strength and conductivity of the bimetal with a large plasticity by a self-assembled lamellar architecture.
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| GB/T 7714 | Han, Tielong , Hou, Chao , Zhao, Zhi et al. Simultaneous enhancement of strength and conductivity via self-assembled lamellar architecture [J]. | NATURE COMMUNICATIONS , 2024 , 15 (1) . |
| MLA | Han, Tielong et al. "Simultaneous enhancement of strength and conductivity via self-assembled lamellar architecture" . | NATURE COMMUNICATIONS 15 . 1 (2024) . |
| APA | Han, Tielong , Hou, Chao , Zhao, Zhi , Jiao, Zengbao , Li, Yurong , Jiang, Shuang et al. Simultaneous enhancement of strength and conductivity via self-assembled lamellar architecture . | NATURE COMMUNICATIONS , 2024 , 15 (1) . |
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摘要 ：
The immiscible bimetallic composites play an important role in civilian industries and aerospace fields owing to their integrated mechanical and physical properties. However, metallic composites of immiscible constituents suffer from one critical drawback of weak interface bonding, which makes the composites particularly vulnerable at elevated service temperatures. Here we proposed a novel strategy to resolve the challenge by creating lowenergy phase interfaces in a typical immiscible bimetallic W-Cu composite. This was achieved by in-situ reactions of WO3 and CuO with WC, which acts in a dual function as the reducing agent for the reactions and an interface forming agent. The sintered W-WC-Cu composite possessed a significant number of low-energy WC/W and WC/Cu interfaces and exhibited a compressive strength of 609 MPa and a compressive ductility of 22.6 % at 600 degrees C, which ranks among the highest in similar composites. The characteristics of WC/W and WC/Cu interfaces and their effects on the mechanical behavior of the composite were demonstrated by the timely and atomicresolved high-temperature mechanical investigations. The introduced stable interfaces were also found to induce [1 11]BCC -> [011]FCC phase transformation of W as another mechanism of plastic deformation in addition to dislocation activities in W and Cu. This study provides a new approach to greatly enhance the mechanical properties of the immiscible metallic composites.
关键词 ：
Plastic deformation Plastic deformation In-situ reaction In-situ reaction High-temperature mechanical properties High-temperature mechanical properties Interface bonding Interface bonding Immiscible bimetal composites Immiscible bimetal composites
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| GB/T 7714 | Li, Yurong , Zhang, Jianfei , Hou, Chao et al. Enhancing strength-ductility properties of immiscible W-Cu composite by creating low-energy phase interfaces [J]. | COMPOSITES PART B-ENGINEERING , 2024 , 280 . |
| MLA | Li, Yurong et al. "Enhancing strength-ductility properties of immiscible W-Cu composite by creating low-energy phase interfaces" . | COMPOSITES PART B-ENGINEERING 280 (2024) . |
| APA | Li, Yurong , Zhang, Jianfei , Hou, Chao , Lu, Hao , Wang, Haibin , Liu, Xuemei et al. Enhancing strength-ductility properties of immiscible W-Cu composite by creating low-energy phase interfaces . | COMPOSITES PART B-ENGINEERING , 2024 , 280 . |
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摘要 ：
The preparation of nanocrystalline W-Cu powders plays a significant role in the production of high -performance W-Cu composites. The chemical reduction method is a promising approach for industrial nano-powder synthesis. However, the influence of various reduction parameters on the morphology and grain size of the reduced powders, as well as their underlying mechanisms, have remained unclear. In this study, we investigated the effects of reduction steps, temperature, duration, hydrogen inflow rate, and copper content on the grain size of the composite powders and disclosed the related mechanisms. Through optimization of reaction parameters, W-Cu powders with grain sizes below 50 nm were obtained. Moreover, the utilization of the synthesized nanocrystalline W-Cu powders as raw materials yielded a bulk W-20Cu composite with an ultrahigh hardness of 600 HV30.
关键词 ：
Freeze-drying Freeze-drying Hydrogen reduction Hydrogen reduction Nanocrystalline Nanocrystalline W-cu alloy W-cu alloy
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| GB/T 7714 | Han, Tielong , Zhang, Di , Sun, Yaochuan et al. Synthesis of nanocrystalline W-Cu powders via freeze-drying and hydrogen reduction [J]. | INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS , 2024 , 120 . |
| MLA | Han, Tielong et al. "Synthesis of nanocrystalline W-Cu powders via freeze-drying and hydrogen reduction" . | INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS 120 (2024) . |
| APA | Han, Tielong , Zhang, Di , Sun, Yaochuan , Hou, Chao , Li, Yurong , Song, Xiaoyan . Synthesis of nanocrystalline W-Cu powders via freeze-drying and hydrogen reduction . | INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS , 2024 , 120 . |
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摘要 ：
The intermetallic compounds based on the tetragonal ThMn12 prototype crystal structure have exhibited great potential as advanced rare-earth-lean permanent magnets due to their excellent intrinsic magnetic properties. However, the trade-off between the phase stability and the magnetic performance is often encountered in the ThMn12 -type magnets. This work was focused on the effects of V doping and nanostructuring on the phase stability and magnetic properties of ThMn12 -type Sm-Co-based magnets. Novel SmCo12 -based nanocrystalline alloys with the SmCo12 main phase were prepared for the first time. The prepared alloys from the optimal design achieved obviously higher coercivity than the isotropic SmFe12 based alloys, together with comparable performance of other magnetic features. The enhancement in the coercivity was ascribed to the pinning of domain walls by the nanocrystalline grain boundaries and stacking faults. First-principles calculations and magnetic structure analysis disclosed that V substitution can stabilize the SmCo12 lattice and elevate its magnetocrystalline anisotropy. This study provides a new approach to developing stabilized metastable structured rare-earth-lean alloys with high magnetic performance. (c) 2024 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
关键词 ：
Phase stability Phase stability Nanostructuring Nanostructuring SmCo12-based magnets SmCo12-based magnets Coercivity Coercivity
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| GB/T 7714 | Shang, Mengyao , Lu, Hao , Xu, Guojing et al. Nanocrystalline SmCo12 main-phase alloys with V-doping: Structure stability and magnetic performance [J]. | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY , 2024 , 210 : 254-264 . |
| MLA | Shang, Mengyao et al. "Nanocrystalline SmCo12 main-phase alloys with V-doping: Structure stability and magnetic performance" . | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 210 (2024) : 254-264 . |
| APA | Shang, Mengyao , Lu, Hao , Xu, Guojing , Song, Xiaoyan . Nanocrystalline SmCo12 main-phase alloys with V-doping: Structure stability and magnetic performance . | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY , 2024 , 210 , 254-264 . |
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摘要 ：
Transgranular brittle fracture is the dominant failure mode of brittle materials, including ceramics and ceramic matrix composites. However, strengthening these materials without sacrificing their toughness has been a big challenge. In this study, an innovative approach is proposed to achieve coordinated strengthening and toughening of ceramics-based composites by introducing specific ductile coherent nanoparticles into ceramic grains. As an example, the WC-Co cemented tungsten carbides were used to demonstrate how this brittle material can achieve ultrahigh strength without losing toughness by seeding metallic nanoparticles inside WC grains. The mechanisms for inducing the formation and modulating the amount, size, and distribution of such nanophase within the ceramic grains were disclosed. The fraction of transgranular ruptures of the brittle ceramic phase was reduced significantly due to the presence of the ductile coherent in-grain nanoparticles. Both the strength and strain limit of the cemented carbides were remarkably increased compared to their counterparts reported in the literature. The coordinated strengthening and toughening strategy proposed in this work is applicable to a broad range of ceramics and ceramic matrix composites to obtain superior comprehensive mechanical properties. A novel strategy is proposed to achieve coordinated strengthening and toughening of brittle composites by introducing and tailoring ductile nanoparticles within ceramic grains. Transgranular fractures of the ceramic phase were remarkably reduced.
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| GB/T 7714 | Zhao, Chong , Lu, Hao , Wang, Haibin et al. Seeding ductile nanophase in ceramic grains [J]. | MATERIALS HORIZONS , 2024 , 11 (8) : 1908-1922 . |
| MLA | Zhao, Chong et al. "Seeding ductile nanophase in ceramic grains" . | MATERIALS HORIZONS 11 . 8 (2024) : 1908-1922 . |
| APA | Zhao, Chong , Lu, Hao , Wang, Haibin , Liu, Xuemei , Fang, Zhigang Zak , Hou, Chao et al. Seeding ductile nanophase in ceramic grains . | MATERIALS HORIZONS , 2024 , 11 (8) , 1908-1922 . |
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摘要 ：
W-Cu composites have been widely applied in numerous critical applications due to their excellent comprehensive properties. However, the mechanical properties and physical properties of W-Cu composites can hardly be enhanced simultaneously. In this paper, multilayered W-Cu composites with various copper contents were fabricated by the electric field assisted fast hot-pressing technology. The prepared multilayered W-Cu composites demonstrate simultaneous enhancement in compressive yield strength, electrical conductivity, and wear resistance compared to those of the commercial counterparts. The improved strength can be attributed to both the enhanced stress partitioning and the exceptional strength of the tungsten layer. The combined lower friction coefficient and high strength of the composites contribute to the reduced wear rate. Moreover, the in-situ compression test reveals that the plastic strain of the multilayered W-Cu composites is primarily governed by the nucleation of kinking band, which differs it from the nanolaminated composites where plastic strain is also contributed by the propagation of kinking band. This work reveals the advantages of the multilayered structure and provides new insight for the structural design of high-performance W-Cu composites.
关键词 ：
Wear resistance Wear resistance W -Cu composites W -Cu composites Multilayered structure Multilayered structure Strength Strength Electrical conductivity Electrical conductivity
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| GB/T 7714 | Sun, Yaochuan , Han, Tielong , Hou, Chao et al. Multilayered W-Cu composites with enhanced strength, electrical conductivity and wear resistance [J]. | COMPOSITES PART B-ENGINEERING , 2024 , 283 . |
| MLA | Sun, Yaochuan et al. "Multilayered W-Cu composites with enhanced strength, electrical conductivity and wear resistance" . | COMPOSITES PART B-ENGINEERING 283 (2024) . |
| APA | Sun, Yaochuan , Han, Tielong , Hou, Chao , Wang, Yijing , Li, Yurong , Zhao, Zhi et al. Multilayered W-Cu composites with enhanced strength, electrical conductivity and wear resistance . | COMPOSITES PART B-ENGINEERING , 2024 , 283 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
In this paper, the effects of residual stress (RS) on the microstructure, crystal defects evolution, and mechanical behavior of WC-Co cemented carbides were investigated by molecular dynamics (MD) simulations. The microscopic behaviors, such as dislocation generation, proliferation and interaction, microcrack initiation and propagation, were studied for the WC-Co cemented carbides under different predefined stress states. The results showed that the cemented carbide with RS had a lower compressive strength. The dislocation densities in both WC and Co increased significantly compared with those in the cemented carbide without RS, and the dislocations in WC with RS initiated at a smaller strain. Due to the presence of RS, the critical stress required for microcrack nucleation at WC/WC grain boundaries and WC/Co phase boundaries decreased, and the proportion of crack propagation along WC/WC grain boundaries increased. The RS increased the probability of fracture in Co and decreased the probability of WC transgranular fracture. It was proposed that tailoring microstructure to decrease the WC contiguity would be beneficial to improve the compressive strength of WC-Co cemented carbides with inevitable RS.
关键词 ：
Residual stress Residual stress Dislocation Dislocation Crack nucleation Crack nucleation Simulation Simulation Cemented carbide Cemented carbide
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| GB/T 7714 | Wang, Chen , Lu, Hao , Liu, Xuemei et al. Effects of residual stress on dislocations and microcracks evolution in WC-Co cemented carbides - A simulation study [J]. | INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS , 2024 , 121 . |
| MLA | Wang, Chen et al. "Effects of residual stress on dislocations and microcracks evolution in WC-Co cemented carbides - A simulation study" . | INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS 121 (2024) . |
| APA | Wang, Chen , Lu, Hao , Liu, Xuemei , Wang, Haibin , Liu, Chao , Lin, Liangliang et al. Effects of residual stress on dislocations and microcracks evolution in WC-Co cemented carbides - A simulation study . | INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS , 2024 , 121 . |
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摘要 ：
一种低缺陷硬质合金的激光增材制造方法，属于硬质合金增材制造技术领域。首先对WC‑Co复合粉末进行团聚造粒，然后与团聚造粒后的Co粉进行机械混合，采用选区激光熔化设备对上述混合粉末进行逐层打印成形，利用混合粉末中含有聚集态的Co熔化后填充粉末颗粒间的孔洞，降低凝固时金属陶瓷相间的应力梯度，从而打印得到低缺陷、且综合力学性能良好的异形硬质合金工件。
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| GB/T 7714 | 王海滨 , 宋晓艳 , 邢明 et al. 一种低缺陷硬质合金的激光增材制造方法 : CN202310267889.9[P]. | 2023-03-14 . |
| MLA | 王海滨 et al. "一种低缺陷硬质合金的激光增材制造方法" : CN202310267889.9. | 2023-03-14 . |
| APA | 王海滨 , 宋晓艳 , 邢明 , 赵治 , 刘雪梅 . 一种低缺陷硬质合金的激光增材制造方法 : CN202310267889.9. | 2023-03-14 . |
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