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学者姓名：刘明
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Abstract ：
Micromechanical characterization of brittle ceramics remains challenging due to the difficulty in sample preparation required by conventional tests. The micromechanical properties (e.g., elastic modulus EIT, indentation hardness HIT, and fracture toughness KIC) of ZrO2 and Si3N4 were investigated by indentation and scratch tests with different indenters (e.g., Vickers, Knoop, and Berkovich indenters) under various loads. The ratio of the true hardness by the Vickers indenter over that by the Knoop indenter is approximately a constant of 1.13 and independent of material. Elastic recovery of residual imprint by the Knoop indenter was also used to assess elastic modulus of ZrO2 and Si3N4, and modified equations were proposed. The length of Vickers indenter-induced cracking was found to be proportional to the applied load under large loads, and a modified formula for calculating fracture toughness was proposed for ZrO2 and Si3N4, which have relatively large fracture toughness of about 9 MPa⋅m1/2. The critical void volume fraction f* in the nanoindentation energy-based methods was found to linearly decrease with the exponent mf of the power-law equation used for curve fitting of the degradation of HIT or EIT with hmax. The determination of fracture toughness by scratch methodology was found to be affected by mechanical properties of material, indenter geometry, and data range. © 2024 Elsevier Ltd and Techna Group S.r.l.
Keyword ：
Brittle fracture Brittle fracture Ceramic materials Ceramic materials Curve fitting Curve fitting Ductile fracture Ductile fracture Elastic moduli Elastic moduli Fracture testing Fracture testing Fracture toughness Fracture toughness Hardness Hardness Indentation Indentation Silicon nitride Silicon nitride Void fraction Void fraction Weibull distribution Weibull distribution Zirconia Zirconia
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| GB/T 7714 | Liu, Ming , Chen, Shuai . Micromechanical characterization of zirconia and silicon nitride ceramics using indentation and scratch methods [J]. | Ceramics International , 2024 , 50 (11) : 19982-20010 . |
| MLA | Liu, Ming 等. "Micromechanical characterization of zirconia and silicon nitride ceramics using indentation and scratch methods" . | Ceramics International 50 . 11 (2024) : 19982-20010 . |
| APA | Liu, Ming , Chen, Shuai . Micromechanical characterization of zirconia and silicon nitride ceramics using indentation and scratch methods . | Ceramics International , 2024 , 50 (11) , 19982-20010 . |
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High-entropy or medium-entropy alloys are emerging as promising materials for high-temperature applications due to exceptional properties. In this study, the nano Al2O3 reinforced (CoCrNi)94Al3Ti3 medium-entropy alloy (MEA) composites were prepared using spark plasma sintering (SPS). The nanohardness (7.0 GPa) and elastic modulus (255.3 GPa) of (CoCrNi)94Al3Ti3-2 wt% Al2O3 (2AMEA) are notably higher than MEA, reducing the wear rate by about 50% at 25 and 400 °C compared to the MEA. Meanwhile, 2AMEA forms a continuous strip-like oxide glaze tribo-layer at 800 °C, porviding excellent antioxidative and tribological properties. This study proved the feasibility of enhancing high-temperature wear resistance of medium-entropy alloy via nano-Al2O3. © 2024 Elsevier Ltd
Keyword ：
Alumina Alumina Aluminum alloys Aluminum alloys Aluminum oxide Aluminum oxide Cobalt alloys Cobalt alloys Entropy Entropy High-entropy alloys High-entropy alloys High temperature applications High temperature applications Reinforcement Reinforcement Spark plasma sintering Spark plasma sintering Tribology Tribology Wear of materials Wear of materials Wear resistance Wear resistance
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| GB/T 7714 | Yu, Kaixuan , Cheng, Jun , Cheng, Qianqian et al. Enhanced wear resistance in (CoCrNi)94Al3Ti3 medium-entropy alloy at high temperatures via nano-Al2O3 reinforcing phase [J]. | Tribology International , 2024 , 195 . |
| MLA | Yu, Kaixuan et al. "Enhanced wear resistance in (CoCrNi)94Al3Ti3 medium-entropy alloy at high temperatures via nano-Al2O3 reinforcing phase" . | Tribology International 195 (2024) . |
| APA | Yu, Kaixuan , Cheng, Jun , Cheng, Qianqian , Geng, Yushan , Zhu, Shengyu , Liu, Ming et al. Enhanced wear resistance in (CoCrNi)94Al3Ti3 medium-entropy alloy at high temperatures via nano-Al2O3 reinforcing phase . | Tribology International , 2024 , 195 . |
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Hydrogel coatings of catheters have attracted extensive attention in the field of medical devices due to its hydrophilicity and softness, while scarcities of Janus adhesion, adaptive antibacterial property, and real-time disease monitoring restricted their clinical translational applications. Herein, a novel hydrogel coating with water-responsive Janus adhesion and acidity-triggered transformation was fabricated for antibacterial treatment and fluorescence diagnosis of catheters-associated infections. First, a sufficient adhesion strength of 44.6 ± 1.9 kPa effectively prevented shedding of the hydrogel coating during catheterization, and meanwhile a super-lubricated layer with an extremely-low coefficient of friction of about 0.03 was formed to reduce friction pain in an aqueous microenvironment. Furthermore, size and fluorescence intensity of chitosan/bovine serum albumin-gold nanoparticles within the hydrogel were varied with pH due to acidity-triggered transformation, where an adaptive release of antibacterial nanoparticles was achieved to reduce biofilms formation and alleviate inflammation degree synergistically. More importantly, such antibacterial treatment was monitored in real-time dependent on an on–off variation of fluorescence intensity. Overall, amounts of in-vitro and in-vivo results performed in rabbit urinary tract infection model and porcine tracheal intubation model fully suggested our newly-synthesized hydrogel coating on universal medical devices showed a promising potential for integrated diagnosis and treatment of catheters-associated infections. © 2024 Elsevier B.V.
Keyword ：
Adhesion Adhesion Catheters Catheters Diagnosis Diagnosis Fluorescence Fluorescence Friction Friction Hydrogels Hydrogels Nanoparticles Nanoparticles
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| GB/T 7714 | Liu, Yanyun , Li, Ming , Zheng, Ying et al. Hydrogel coatings on universal medical devices with water-responsive Janus adhesion and acidity-triggered transformation for adaptive antibacterial treatment and fluorescence diagnosis [J]. | Chemical Engineering Journal , 2024 , 481 . |
| MLA | Liu, Yanyun et al. "Hydrogel coatings on universal medical devices with water-responsive Janus adhesion and acidity-triggered transformation for adaptive antibacterial treatment and fluorescence diagnosis" . | Chemical Engineering Journal 481 (2024) . |
| APA | Liu, Yanyun , Li, Ming , Zheng, Ying , Liu, Changhua , Cao, Yang , Guo, Wei et al. Hydrogel coatings on universal medical devices with water-responsive Janus adhesion and acidity-triggered transformation for adaptive antibacterial treatment and fluorescence diagnosis . | Chemical Engineering Journal , 2024 , 481 . |
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Understanding the deformation and fracture behavior of single crystal silicon carbide (SiC) under a single particle is of scientific and practical importance for the micromachining of single crystal SiC. In this work, we investigate the indentation fracture of a 4H-SiC single crystal wafer with the indentation direction perpendicular to (0001) plane, using Berkovich, Vickers, and Knoop indenters. All the indentations create radial cracks for the normal loads used in this work. Both the Vickers and Knoop hardness tests produce lateral cracks. The fracture toughness calculated from the Vickers hardness tests is smaller than the ones calculated from the Knoop hardness tests and the Berkovich indentations under large indentation loads. The fracture toughness of 4H-SiC single crystal decreases with the increase of the indentation load under small indentation loads for the Berkovich indentations, revealing the phenomenon of surface hardening. The surface energy calculated from the radial cracks is comparable to the results reported in the literature. We establish an analytical expression of the total energy dissipation of a single indentation cycle, including the contribution of indentation-induced cracking, which offers an approach to calculate the ratio of the energy dissipation due to cracking to the energy dissipation due to plastic deformation and determine the dominant deformation process controlling the indentation deformation. The analysis of the energy dissipation for the indentations of the 4H-SiC single crystal by the Berkovich indenter reveals that the energy dissipation from the indentation-induced cracking is significantly larger than (more than eight times) that from plastic deformation for the indentation loads larger than 75 mN.
Keyword ：
4H-SiC single crystal 4H-SiC single crystal Deformation and cracking Deformation and cracking Energy dissipation Energy dissipation Fracture toughness Fracture toughness Indentation and hardness Indentation and hardness Mechanical properties Mechanical properties
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| GB/T 7714 | Hou, Dongyang , Liu, Ming , Liu, Sheng et al. Indentation fracture of 4H-SiC single crystal [J]. | INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES , 2024 , 270 . |
| MLA | Hou, Dongyang et al. "Indentation fracture of 4H-SiC single crystal" . | INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES 270 (2024) . |
| APA | Hou, Dongyang , Liu, Ming , Liu, Sheng , Yang, Fuqian . Indentation fracture of 4H-SiC single crystal . | INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES , 2024 , 270 . |
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为利用努氏硬度表征金属材料弹性模量和屈服强度，提出了Marshall和Conway的修正模型表征弹性模量，以及Lockett、Yu、Marsh、Johnson和Vandeperre的修正模型表征屈服强度，开拓了努氏硬度表征金属材料力学性能的新应用。选取35种金属进行努氏硬度试验，利用Meyer定律、弹塑性变形模型、Hays-Kendall模型和比例试样模型对努氏硬度的正压痕尺寸效应(硬度随载荷的减小而增大)进行了分析，可以用大载荷下趋于稳定的硬度值代表材料的真硬度。首次考虑金属材料在努氏压痕短对角线处材料堆积的影响，Marshall模型和Conway模型进行了修正：Marshall模型中原有的常参数α修正为b/d(努氏压痕短对角线与长对角线的比值)的二次函数；Conway模型引入了与b/d的平方呈线性关系修正系数β。通过比较文献中与原模型计算的屈服强度，引入修正系数k,首次获得了基于努氏硬度利用Lockett、Yu、Marsh、Johnson和Vandeperre模型计算金属屈服强度的修正模型。结果表明：除Ti6Al4V和Sn外，修正模型与仪器化压入得到的弹性模量一致，置信度不低于0.94;除60Si2Mn弹簧钢外，修正后得到的屈服强度与文献值一致，置信度不低于0.90。
Keyword ：
仪器化压入 仪器化压入 努氏硬度 努氏硬度 屈服强度 屈服强度 弹性模量 弹性模量 金属 金属
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| GB/T 7714 | 刘明 , 徐智通 , 尉贺宝 . 利用努氏硬度表征金属的弹性模量和屈服强度 [J]. | 哈尔滨工业大学学报 , 2024 , 56 (04) : 108-119 . |
| MLA | 刘明 et al. "利用努氏硬度表征金属的弹性模量和屈服强度" . | 哈尔滨工业大学学报 56 . 04 (2024) : 108-119 . |
| APA | 刘明 , 徐智通 , 尉贺宝 . 利用努氏硬度表征金属的弹性模量和屈服强度 . | 哈尔滨工业大学学报 , 2024 , 56 (04) , 108-119 . |
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Size effect of the nickel-based single crystal superalloy DD6 is investigated in this study by performing nanoindentation experiments and finite element (FE) simulations by emphasizing the strain rate effect. An analytical method is proposed to identify whether a material has the indentation size effect (ISE) based on incremental formulations of the indentation strain rate. By taking ISE as a critical factor, the contact area is further described by considering the curvature radius of non-ideal indenters due to wear issues in practice. In order to emphasize the strain rate effect during indentations, the material parameters dominating mechanical properties are adopted from the strain rate dependent Johnson-Cook model, particular for the nickel-based single crystal superalloy. Consequently, the dimensional ISE analysis is performed by proposing a theoretical framework to establish the relationship among the indentation strain rate, the indenter tip curvature radius and the applied load-penetration depth (P-h) curve for characterizing nanoindentation responses. By identifying the indenter curvature radii and loading time as the important external factors of hardness measurement, FE simulations are validated to achieve good agreement with experimental data. The validated FE predictions are reliably employed to calibrate the dimensionless model of hardness with different indenter curvature radii and loading rates. In the proposed form of the dimensional hardness model, it is found that the indenter curvature radius can be perfectly independent of the material constitutive properties and loading rates. It reveals the potential and advantageous determination of characteristic length of materials by using nanoindentation.
Keyword ：
Hardness Hardness Nanoindentation Nanoindentation Single crystal superalloy Single crystal superalloy Size effect Size effect Strain rate effect Strain rate effect
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| GB/T 7714 | Long, Xu , Shen, Ziyi , Li, Jiao et al. Size effect of nickel-based single crystal superalloy revealed by nanoindentation with low strain rates [J]. | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2024 , 29 : 2437-2447 . |
| MLA | Long, Xu et al. "Size effect of nickel-based single crystal superalloy revealed by nanoindentation with low strain rates" . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 29 (2024) : 2437-2447 . |
| APA | Long, Xu , Shen, Ziyi , Li, Jiao , Dong, Ruipeng , Liu, Ming , Su, Yutai et al. Size effect of nickel-based single crystal superalloy revealed by nanoindentation with low strain rates . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2024 , 29 , 2437-2447 . |
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One of the challenges in the applications of instrumented indentation is to simultaneously measure elastic modulus and Poisson's ratio of homogeneous, isotropic materials. This work proposes empirical equations for simultaneous calculation of elastic modulus and Poisson's ratio of bulk metallic glasses (BMGs) from the ratio of the short diagonal length to the long diagonal length and the area of the Knoop imprint. The parameters presented in the empirical equations are determined first by Knoop microhardness tests of 24 BMGs, whose elastic moduli and Poisson's ratios are measured by resonant ultrasound spectroscopy. These empirical equations are further validated by the Knoop microhardness tests of other 3 BMGs, which yield elastic moduli and Poisson's ratios in good accordance with the corresponding ones available in the literature and with the results from nanoindentation tests. This work opens a new venue of Knoop microhardness test as an economical and efficient method to measure both elastic modulus and Poisson's ratio of BMGs.
Keyword ：
Bulk metallic glasses Bulk metallic glasses Elastic modulus Elastic modulus Knoop microhardness test Knoop microhardness test Poisson's ratio Poisson's ratio Residual imprint Residual imprint
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| GB/T 7714 | Xu, Zhitong , Liu, Ming , Yang, Fuqian . Calculation of elastic constants of bulk metallic glasses from indentation tests [J]. | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2024 , 28 : 4382-4391 . |
| MLA | Xu, Zhitong et al. "Calculation of elastic constants of bulk metallic glasses from indentation tests" . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 28 (2024) : 4382-4391 . |
| APA | Xu, Zhitong , Liu, Ming , Yang, Fuqian . Calculation of elastic constants of bulk metallic glasses from indentation tests . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2024 , 28 , 4382-4391 . |
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In this work, we conduct micro-scratch tests of nodular cast iron with Vickers indenter under constant normal load and investigate the effects of individual phases (i.e., ferrite and graphite phases) on the scratch characteristics of nodular cast iron. Using a bimodal Gaussian model to fit the experimental data of penetration depth, residual depth, elastic recovery rate, and scratch hardness, we calculate the contribution percentages of individual phases to scratch variables. The scratch variables are independent of the scratch speed used in this work, while the penetration depth increases linearly with increasing the normal load. There exists a large difference between the contribution percentages and the volume fractions calculated from SEM images and XRD pattern. Such a large difference suggests that the bimodal Gaussian distribution analysis does not include the effect of the interaction between two phases on the scratch characteristics of dual-phase materials with significantly distinct mechanical properties and geometrical dimensions. A more refined method taking into account the interaction between two phases needs to be developed for the analysis of the scratch characteristics of dual-phase materials.
Keyword ：
Ferritic nodular cast iron Ferritic nodular cast iron Micromechanical properties Micromechanical properties Phase fraction Phase fraction Scratch test Scratch test Vickers indenter Vickers indenter
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| GB/T 7714 | Xu, Zhitong , Liu, Ming , Gao, Chenghui et al. Effects of ferrite and graphite phases on scratch characteristics of nodular cast iron [J]. | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2024 , 30 : 2257-2263 . |
| MLA | Xu, Zhitong et al. "Effects of ferrite and graphite phases on scratch characteristics of nodular cast iron" . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 30 (2024) : 2257-2263 . |
| APA | Xu, Zhitong , Liu, Ming , Gao, Chenghui , Yang, Fuqian . Effects of ferrite and graphite phases on scratch characteristics of nodular cast iron . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2024 , 30 , 2257-2263 . |
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采用有限元模拟了剥层后渗碳+热处理+喷丸强化处理后18CrNiMo7-6合金钢表面变质层的残余应力，经试验验证后对其进行了有限元矩阵修正，研究了喷丸强化前后x和y方向残余应力分布，最后进行了有限元矩阵修正法的试验应用。结果表明：局部剥层后残余应力模拟值和测试值相对误差小于10%，证明模型准确；根据残余应力方向选择适用的修正矩阵后，平面非等双轴残余应力有限元矩阵修正值与初始值之间较接近；试验可得未喷丸试样表面变质层内存在近似等双轴残余应力，残余应力修正值与测试值相差不大，喷丸试样x和y方向残余应力间相差显著，表面变质层内存在非等双轴残余应力，残余应力修正值均小于测试值。
Keyword ：
剥层法 剥层法 有限元矩阵修正 有限元矩阵修正 表面变质层 表面变质层 非等双轴残余应力 非等双轴残余应力
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| GB/T 7714 | 张倩琪 , 许鑫鑫 , 张建伟 et al. 表面变质层非等双轴残余应力的X射线/剥层测试与有限元矩阵修正 [J]. | 机械工程材料 , 2024 , 48 (08) : 95-100 . |
| MLA | 张倩琪 et al. "表面变质层非等双轴残余应力的X射线/剥层测试与有限元矩阵修正" . | 机械工程材料 48 . 08 (2024) : 95-100 . |
| APA | 张倩琪 , 许鑫鑫 , 张建伟 , 刘明 . 表面变质层非等双轴残余应力的X射线/剥层测试与有限元矩阵修正 . | 机械工程材料 , 2024 , 48 (08) , 95-100 . |
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Vat photopolymerized 3D printing technology can be used to fabricate ceramics with complex shapes. However, the extensive use of photosensitive resins as binders is not conducive to achieving crack-free ceramic green parts, especially the Si3N4 ceramics with the weak interlayer bonding. In this work, the influence of different debinding atmosphere on the pyrolysis process of organics in vat photopolymerization 3D printed Si3N4 green parts was investigated. The results showed that the use of 95 vol% N2+5 vol% H2 atmosphere can effectively inhibit the cracking during the debinding process, especially the wall thickness of the 3D printed defect-free Si3N4 green body was successfully increased to 5 mm, and the obtained sintered Si3N4 ceramics exhibited higher true densities and better mechanical properties. The debinding atmospheres proposed in the current work provided additional options of debinding atmosphere for achieving high-performance 3D printed Si3N4 ceramics and are expected to be expanded to other photosensitive slurry systems, with the potential to enable the production of ceramic components with the larger wall thicknesses. © 2024
Keyword ：
Debinding atmosphere Debinding atmosphere Mechanical properties Mechanical properties Si3N4 ceramics Si3N4 ceramics Sintering temperature Sintering temperature Vat photopolymerization 3D printing Vat photopolymerization 3D printing
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| GB/T 7714 | Shen, M. , Fu, R. , Zhang, Y. et al. Defect-free Si3N4 ceramics by vat photopolymerization 3D printing with nitrogen-hydrogen debinding atmosphere [J]. | Ceramics International , 2024 , 50 (21) : 42709-42720 . |
| MLA | Shen, M. et al. "Defect-free Si3N4 ceramics by vat photopolymerization 3D printing with nitrogen-hydrogen debinding atmosphere" . | Ceramics International 50 . 21 (2024) : 42709-42720 . |
| APA | Shen, M. , Fu, R. , Zhang, Y. , Sun, K. , Xu, W. , Jiang, Y. et al. Defect-free Si3N4 ceramics by vat photopolymerization 3D printing with nitrogen-hydrogen debinding atmosphere . | Ceramics International , 2024 , 50 (21) , 42709-42720 . |
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