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学者姓名：宋晓艳
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摘要 ：
基于构建适用于第一性原理计算、原子比例准确为Sm∶Co=1∶7的晶体结构模型,依据实验研究中得到的物相共存结果,对Mn和In掺杂的Sm-Co体系模型进行了系列计算分析。利用热力学计算方法,定量化研究了Mn和In在Sm-Co体系中优先占位特点及掺杂元素占位概率随温度的变化规律。通过Sm-Co合金掺杂体系的能量和电子结构计算,研究了Mn和In单掺杂SmCo_7体系的结构稳定性。基于计算结果揭示了Mn和In对掺杂合金体系中原子间相互作用的影响,阐明了提升体系结构稳定性的微观机制,并提出了Mn添加可增加SmCo_7合金的总磁矩,揭示了掺杂元素对SmCo_7合金饱和磁化强度的影响规律。
关键词 ：
结构稳定性 结构稳定性 第一性原理计算 第一性原理计算 元素掺杂 元素掺杂 Sm-Co基永磁合金 Sm-Co基永磁合金 磁矩 磁矩
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| GB/T 7714 | 毛斐 , 吕皓 , 唐法威 et al. Mn和In添加对SmCo_7结构稳定性及磁矩影响的第一性原理计算 [J]. | 金属学报 , 2021 , 57 (07) : 948-958 . |
| MLA | 毛斐 et al. "Mn和In添加对SmCo_7结构稳定性及磁矩影响的第一性原理计算" . | 金属学报 57 . 07 (2021) : 948-958 . |
| APA | 毛斐 , 吕皓 , 唐法威 , 郭凯 , 刘东 , 宋晓艳 . Mn和In添加对SmCo_7结构稳定性及磁矩影响的第一性原理计算 . | 金属学报 , 2021 , 57 (07) , 948-958 . |
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摘要 ：
以原位还原碳化技术制备的WC-8Co复合粉和VC粉末为原料,采用低压烧结技术制备出超细晶硬质合金。系统研究了VC添加量和复合粉中碳含量对硬质合金的相组成、显微组织、室温和高温力学性能的影响。结果表明:硬质合金的晶粒尺寸、硬度和断裂韧性主要受VC添加量的影响,且随VC添加量的增加呈单调变化;抗弯强度随VC添加量的变化趋势与碳含量有关;压缩强度随温度的变化呈现先降低后升高的趋势;当WC-Co复合粉的碳含量为5.60%～5.68%(质量分数)、VC添加量不超过0.5%时,可分别制备出室温抗弯强度为4482MPa和600℃下抗压缩强度为4914MPa的高综合性能的超细晶硬质合金。基于微观组织特征的分析...
关键词 ：
VC添加 VC添加 高温压缩性能 高温压缩性能 超细晶硬质合金 超细晶硬质合金 碳含量 碳含量 力学性能 力学性能
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| GB/T 7714 | 李雨衡 , 刘雪梅 , 刘超 et al. VC和碳含量对超细晶硬质合金室温和高温性能的影响 [J]. | 稀有金属材料与工程 , 2021 , 50 (06) : 2169-2176 . |
| MLA | 李雨衡 et al. "VC和碳含量对超细晶硬质合金室温和高温性能的影响" . | 稀有金属材料与工程 50 . 06 (2021) : 2169-2176 . |
| APA | 李雨衡 , 刘雪梅 , 刘超 , 吕皓 , 宋晓艳 . VC和碳含量对超细晶硬质合金室温和高温性能的影响 . | 稀有金属材料与工程 , 2021 , 50 (06) , 2169-2176 . |
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摘要 ：
首先探究了以Nb2O5、Co和炭黑的原位反应制备纳米NbC-Co复合粉末的最佳工艺,然后以此复合粉作为添加剂,研究了其对低压烧结制备WC-Co硬质合金组织和性能的影响.热力学计算和原位反应实验结果表明,原料粉末中未添加Co时存在明显的Nb2O5→NbO2→NbC两段反应过程,而添加Co不仅显著降低了反应发生温度,还使Nb2O5的还原、碳化两步反应几乎同时进行.通过优化原料粉末的配碳量、反应温度,制备的NbC-Co复合粉物相纯净,具有较低的氧含量,平均粒径为82nm.添加纳米NbC-Co使制备的WC-Co硬质合金的晶粒尺寸由0.7 μm降低至0.48 μm,组织更为均匀,室温和高温硬度均明显提高.即使温度达到800℃,制备的WC-12Co-1NbC硬质合金的硬度仍维持在890HV3?.
关键词 ：
原位合成 原位合成 硬质合金 硬质合金 纳米NbC-Co复合粉 纳米NbC-Co复合粉 高温硬度 高温硬度
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| GB/T 7714 | 王海滨 , 占王彬 , 刘雪梅 et al. 纳米NbC-Co复合粉末的原位合成及其在烧结硬质合金中的应用 [J]. | 粉末冶金工业 , 2021 , 31 (1) : 9-16 . |
| MLA | 王海滨 et al. "纳米NbC-Co复合粉末的原位合成及其在烧结硬质合金中的应用" . | 粉末冶金工业 31 . 1 (2021) : 9-16 . |
| APA | 王海滨 , 占王彬 , 刘雪梅 , 刘超 , 侯超 , 宋晓艳 . 纳米NbC-Co复合粉末的原位合成及其在烧结硬质合金中的应用 . | 粉末冶金工业 , 2021 , 31 (1) , 9-16 . |
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摘要 ：
纳米NbC-Co复合粉末的原位合成及其在烧结硬质合金中的应用
关键词 ：
原位合成 原位合成 硬质合金 硬质合金 纳米NbC-Co复合粉 纳米NbC-Co复合粉 高温硬度 高温硬度
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| GB/T 7714 | 王海滨 , 占王彬 , 刘雪梅 et al. 纳米NbC-Co复合粉末的原位合成及其在烧结硬质合金中的应用 [J]. | 王海滨 , 2021 , 31 (1) : 9-16 . |
| MLA | 王海滨 et al. "纳米NbC-Co复合粉末的原位合成及其在烧结硬质合金中的应用" . | 王海滨 31 . 1 (2021) : 9-16 . |
| APA | 王海滨 , 占王彬 , 刘雪梅 , 刘超 , 侯超 , 宋晓艳 et al. 纳米NbC-Co复合粉末的原位合成及其在烧结硬质合金中的应用 . | 王海滨 , 2021 , 31 (1) , 9-16 . |
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摘要 ：
The interactions between oxidation and external friction usually cause accelerated failure of materials by repeated destruction of protective oxide layers. In this work, we discovered that in a unique boride coating fabricated by thermal spraying pre-treated WB-Co powder on steel, the friction-induced microstructural defects at elevated temperatures can be self-repaired by plastic flow and redistribution of nanocrystalline WO3, CoWO4 and molten B2O3. Besides, strong mechanical support from the underlying coating was favorable for slowing down the oxide growth. Based on understanding of the oxidation-resistance mechanisms of this oxide-boride system, a new strategy for developing highly anti-oxidative ceramic-based materials is proposed. © 2020 Elsevier Ltd
关键词 ：
Boride coatings Boride coatings Borides Borides Cobalt alloys Cobalt alloys Friction Friction Nanocrystalline materials Nanocrystalline materials Nanocrystals Nanocrystals Oxidation resistance Oxidation resistance Thermal spraying Thermal spraying Tungsten compounds Tungsten compounds
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| GB/T 7714 | Sun, Shibo , Wang, Haibin , Liu, Xuemei et al. Outstanding anti-oxidation performance of boride coating under high-temperature friction [J]. | Corrosion Science , 2021 , 179 . |
| MLA | Sun, Shibo et al. "Outstanding anti-oxidation performance of boride coating under high-temperature friction" . | Corrosion Science 179 (2021) . |
| APA | Sun, Shibo , Wang, Haibin , Liu, Xuemei , Liu, Chao , Lu, Hao , Nie, Zuoren et al. Outstanding anti-oxidation performance of boride coating under high-temperature friction . | Corrosion Science , 2021 , 179 . |
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摘要 ：
A thermodynamic model was developed based on the first principles to describe the thermal stability in the phase-separated alloy systems. The distributions of the solute atoms in the nanocrystalline system were predicted for the heating process, using the typical phase-separating system of W-Cr alloy as an example. The effects of the re-dissolution and grain-boundary segregation processes on the thermal stability of the nanograin structure were investigated, based on which the critical conditions of grain size and solute concentration for controlling destabilization of nanostructure at high temperatures were proposed. The transformation of solute distribution from phase separation to grain-boundary segregation was described in detail by the present model without introducing any empirical parameters. The calculations indicated that the stabilization mechanisms are distinct for the single- and double-phase states of the nanocrystalline alloys even at the same composition. Thus the approach to inhibit nanograin growth is flexible by adjusting the solute distribution to reach either the thermodynamically stable or the meta-stable state. This study advanced the understanding of the doping effect and facilitated precise design of nanocrystalline alloys with high stability during high-temperature heat treatment. © 2021 Elsevier B.V.
关键词 ：
Binary alloys Binary alloys Calculations Calculations Chromium alloys Chromium alloys Grain boundaries Grain boundaries Heat treatment Heat treatment Molybdenum alloys Molybdenum alloys Nanocrystalline alloys Nanocrystalline alloys Nanocrystals Nanocrystals Phase separation Phase separation Segregation (metallography) Segregation (metallography) System stability System stability Thermodynamic stability Thermodynamic stability Tungsten alloys Tungsten alloys
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| GB/T 7714 | Guo, Hua , Tang, Fawei , Liu, Yong et al. Thermal stability of phase-separated nanograin structure during heat treatment [J]. | Journal of Alloys and Compounds , 2021 , 875 . |
| MLA | Guo, Hua et al. "Thermal stability of phase-separated nanograin structure during heat treatment" . | Journal of Alloys and Compounds 875 (2021) . |
| APA | Guo, Hua , Tang, Fawei , Liu, Yong , Zhao, Zhi , Lu, Hao , Hou, Chao et al. Thermal stability of phase-separated nanograin structure during heat treatment . | Journal of Alloys and Compounds , 2021 , 875 . |
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摘要 ：
Yttria partially stabilized zirconia was introduced into WC-Co cemented carbides to enhance their mechanical performance. The hardness and fracture toughness were improved simultaneously with the addition of ZrO2. Particularly, the fracture toughness of the cemented carbides was significantly enhanced. The mechanism was mainly attributed to the stress-induced phase transformation of tetragonal ZrO2 to monoclinic ZrO2. This phase transformation introduced a compressive stress field and deflected the micro-cracks. In addition, the ZrO2 particles dispersed homogeneously in the WC skeleton and had good interfacial bonding with both WC and Co phases, which was beneficial to the mechanical properties of the cemented carbides. This study provides a new promising approach to break the trade-off between the hardness and fracture toughness of cemented carbides to achieve excellent comprehensive mechanical properties. The new strategy will be also promising to be applied in a variety of cermets or ceramic-based composites. (C) 2021 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
关键词 ：
Cemented carbide Cemented carbide Stress-induced phase transformation Stress-induced phase transformation Toughening Toughening Zirconia Zirconia
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| GB/T 7714 | Jiang, Wentao , Lu, Hao , Chen, Jinghong et al. Toughening cemented carbides by phase transformation of zirconia [J]. | MATERIALS & DESIGN , 2021 , 202 . |
| MLA | Jiang, Wentao et al. "Toughening cemented carbides by phase transformation of zirconia" . | MATERIALS & DESIGN 202 (2021) . |
| APA | Jiang, Wentao , Lu, Hao , Chen, Jinghong , Liu, Xuemei , Liu, Chao , Song, Xiaoyan . Toughening cemented carbides by phase transformation of zirconia . | MATERIALS & DESIGN , 2021 , 202 . |
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摘要 ：
In this study, activated nano TaC was introduced into WC-Co cemented carbides to enhance their comprehensive performance properties. Changes of mechanical properties, elements distributions, phase constitutions and microstructures of the cemented carbides were examined as a function of TaC amount. It was found that due to the addition of activated nano TaC, nanoscale Co-rich particles and cubic-Ta4C3 precipitates were induced and dispersed within WC grains, which had good coherent interfacial relationship with the hard matrix. The combined strengthening effects of the nano precipitates and solid solution in WC resulted in excellent comprehensive mechanical properties of the cemented carbides. Particularly, the rupture strength has achieved the highest among those of the counterparts reported in the literature so far. This study opens a new perspective to use activated nano compound particles to modulate hard phases of cermet materials for high comprehensive performance. © 2020 Elsevier Ltd
关键词 ：
Carbides Carbides Carbide tools Carbide tools Cobalt compounds Cobalt compounds Mechanical properties Mechanical properties
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| GB/T 7714 | Zhao, Chong , Lu, Hao , Liu, Xuemei et al. Strengthening cemented carbides by activated nano TaC [J]. | International Journal of Refractory Metals and Hard Materials , 2021 , 95 . |
| MLA | Zhao, Chong et al. "Strengthening cemented carbides by activated nano TaC" . | International Journal of Refractory Metals and Hard Materials 95 (2021) . |
| APA | Zhao, Chong , Lu, Hao , Liu, Xuemei , Liu, Chao , Nie, Zuoren , Song, Xiaoyan . Strengthening cemented carbides by activated nano TaC . | International Journal of Refractory Metals and Hard Materials , 2021 , 95 . |
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摘要 ：
Using VC and WC-8Co composite powder prepared by in-situ reduction carbonization as raw materials, ultrafine WC-Co cemented carbide was prepared by sinter-HIP technology. The influences of the VC content and the carbon content of the composite powder on the phase composition, microstructure, and mechanical properties of the cemented carbides were investigated. The results show that the grain size, hardness and fracture toughness of cemented carbides are mainly affected by the VC content. These properties change monotonically with the increase of VC content. The change of transverse rupture strength with VC content is related to carbon content. The compression strength decreases first and then increases with the increase of temperature. With the optimized carbon content of WC-8Co composite powder in the range of 5.60wt%similar to 5.68wt% and the VC addition no more than 0.5wt%, the ultrafine cemented carbides with high comprehensive performance were prepared. The highest value of TRS is 4482 MPa at room temperature, and compression strength is 4914 MPa at 600 degrees C. Based on the characteristics of the microstructure and the stress distribution, simulated by the elastic-plastic finite element model, the law of performance change and the mechanism of its performance were analyzed.
关键词 ：
carbon content carbon content high temperature compression strength high temperature compression strength mechanical properties mechanical properties ultrafine cemented carbide ultrafine cemented carbide VC addition VC addition
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| GB/T 7714 | Li Yuheng , Liu Xuemei , Liu Chao et al. Effect of VC Addition and Carbon Content on Mechanical Properties of Ultrafine Cemented Carbides at Room and High Temperatures [J]. | RARE METAL MATERIALS AND ENGINEERING , 2021 , 50 (6) : 2169-2176 . |
| MLA | Li Yuheng et al. "Effect of VC Addition and Carbon Content on Mechanical Properties of Ultrafine Cemented Carbides at Room and High Temperatures" . | RARE METAL MATERIALS AND ENGINEERING 50 . 6 (2021) : 2169-2176 . |
| APA | Li Yuheng , Liu Xuemei , Liu Chao , Lu Hao , Song Xiaoyan . Effect of VC Addition and Carbon Content on Mechanical Properties of Ultrafine Cemented Carbides at Room and High Temperatures . | RARE METAL MATERIALS AND ENGINEERING , 2021 , 50 (6) , 2169-2176 . |
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摘要 ：
The distribution of the residual thermal stress (RTS) in the as-sintered cermets and its interactions with the applied stress were studied by simulations and experiments, using the WC-Co cemented carbides as examples. The influences of grain size, grain morphology and phase configuration on the stress state and mechanical behavior were quantified in the model, which was constructed from real multi-phased microstructures. The results indicate that the volume-averaged RTS is a power function of the mean WC grain size. There is a high level of compressive stress in the WC regions near the triple junctions of adjacent WC grains and Co binder, and a high level of tensile stress inside the Co phase in the vicinity of WC/Co phase boundaries. In the cermets with RTS, the metallic binder exhibits a gradually increasing strain response rate under the external loading. It is found that a smaller WC grain size, a lower proportion of Co thin-layers, and a higher fraction of triple junctions of adjacent WC grains and Co phase, are beneficial to have less stress concentration and simultaneously high strength and fracture toughness of the cermets. This study provides a new approach to characterize stresses in the multi-phased materials and a strategy to adjust stress distribution by tailoring the microstructure for excellent comprehensive mechanical properties. (c) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
关键词 ：
Grain size Grain size Mechanical behavior Mechanical behavior Residual thermal stress Residual thermal stress Strain response Strain response WC hardmetal WC hardmetal
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| GB/T 7714 | Chen, Jinghong , Zhao, Chong , Lu, Hao et al. Effects of residual thermal stress on mechanical behavior of cermets with different grain sizes [J]. | ACTA MATERIALIA , 2021 , 221 . |
| MLA | Chen, Jinghong et al. "Effects of residual thermal stress on mechanical behavior of cermets with different grain sizes" . | ACTA MATERIALIA 221 (2021) . |
| APA | Chen, Jinghong , Zhao, Chong , Lu, Hao , Li, Yanan , Liu, Xuemei , Wang, Haibin et al. Effects of residual thermal stress on mechanical behavior of cermets with different grain sizes . | ACTA MATERIALIA , 2021 , 221 . |
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