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Processing, microstructure and ageing behavior of in-situ submicron TiB2 particles reinforced AZ91 Mg matrix composites EI SCIE Scopus
期刊论文 | 2018 , 764 , 96-106 | JOURNAL OF ALLOYS AND COMPOUNDS
WoS CC Cited Count: 8 SCOPUS Cited Count: 7
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Abstract :

In this paper, in-situ submicron TiB2 particles (2.5 wt.%) reinforced AZ91 matrix composites are processed by the master alloy method combined with an optimized SHS technique. The effect of TiB2 particles on the microstructure, ageing behavior and mechanical properties of Mg matrix composites is investigated. The results reveal that only TiB2 phase is in-situ formed in the Al-TiB2 master alloy and exhibits the size distribution of 100 nm-700 nm. Compared with the unreinforced AZ91 alloy, the grain size and morphology of Mg17Al12 phase in as-cast composites are much refined. The ageing process of composites is accelerated and the peak-aged time of composites decreases from 42 h to 22 h significantly with the introduction of TiB2 particles. Large numbers of fine Mg17Al12 in composites preferentially precipitate at grain boundaries and near TiB2 particles regions. In addition, the hardness, yield strength, ultimate tensile strength and elongation of as-cast composites are improved by 16.1%, 53.0%, 26.3% and 25.6%, respectively. After T6 heat treatment, the strength of composites is increased further due to large amounts of submicron Mg17Al12 phase, and the age hardening efficiency of composites is higher than that of AZ91 alloy. (C) 2018 Elsevier B.V. All rights reserved.

Keyword :

Ageing behavior In-situ Mechanical properties Mg matrix composites Microstructure

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GB/T 7714 Xiao, Peng , Gao, Yimin , Yang, Xirong et al. Processing, microstructure and ageing behavior of in-situ submicron TiB2 particles reinforced AZ91 Mg matrix composites [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2018 , 764 : 96-106 .
MLA Xiao, Peng et al. "Processing, microstructure and ageing behavior of in-situ submicron TiB2 particles reinforced AZ91 Mg matrix composites" . | JOURNAL OF ALLOYS AND COMPOUNDS 764 (2018) : 96-106 .
APA Xiao, Peng , Gao, Yimin , Yang, Xirong , Xu, Feixing , Yang, Cuicui , Li, Bo et al. Processing, microstructure and ageing behavior of in-situ submicron TiB2 particles reinforced AZ91 Mg matrix composites . | JOURNAL OF ALLOYS AND COMPOUNDS , 2018 , 764 , 96-106 .
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Tribological behavior of in-situ nanosized TiB2 particles reinforced AZ91 matrix composite EI SCIE Scopus
期刊论文 | 2018 , 128 , 130-139 | TRIBOLOGY INTERNATIONAL
WoS CC Cited Count: 5 SCOPUS Cited Count: 4
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Abstract :

To enhance the wear resistance of magnesium alloy to expand its applications, AZ91 matrix composite reinforced with TiB2 particles was developed by in-situ casting, and its tribological behavior was investigated. The dry sliding wear experiment was carried out with the sliding speeds of 0.25, 0.50 and 0.75 m/s, at different normal loads of 12.5, 25 and 37.5 N respectively. The hardened AISI 52100 bearing steel was selected as counterbody material. The experimental results reveal that the mechanical properties of composite are improved significantly due to grain refinement and numerous dislocations formed near TiB2 particles. The wear rate of composite reduces with the increase of sliding speeds at all normal loads and wear mechanism is transited from abrasive and mild oxidation wear to delamination and severe oxidation wear, similar to the wear mechanism in various normal loads. However, the mechanically mixed layer formed at higher speeds has a protective effect and the delamination and plastic deformation of subsurface is more severe at higher loads. The wear resistance of composite is greater than that of the matrix at all wear conditions, because TiB2/AZ91 composite possess improved hardness and strength, as well as increased work hardening capacity of subsurface due to the presence of nanosized TiB2 particles.

Keyword :

AZ91 matrix composite In-situ casting TiB2 particles Tribological behavior

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GB/T 7714 Xiao, Peng , Gao, Yimin , Xu, Feixing et al. Tribological behavior of in-situ nanosized TiB2 particles reinforced AZ91 matrix composite [J]. | TRIBOLOGY INTERNATIONAL , 2018 , 128 : 130-139 .
MLA Xiao, Peng et al. "Tribological behavior of in-situ nanosized TiB2 particles reinforced AZ91 matrix composite" . | TRIBOLOGY INTERNATIONAL 128 (2018) : 130-139 .
APA Xiao, Peng , Gao, Yimin , Xu, Feixing , Yang, Cuicui , Li, Yefei , Liu, Zhiwei et al. Tribological behavior of in-situ nanosized TiB2 particles reinforced AZ91 matrix composite . | TRIBOLOGY INTERNATIONAL , 2018 , 128 , 130-139 .
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Effect of milling time on the microstructure and mechanical properties of Ti(C,N)-304 stainless steel cermet SCIE Scopus
期刊论文 | 2018 , 5 (2) | MATERIALS RESEARCH EXPRESS
WoS CC Cited Count: 4 SCOPUS Cited Count: 9
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Abstract :

Effect of milling time on the microstructure and mechanical properties of Ti(C,N)-304 stainless steel cermet and the fracture mechanism were studied in this work. The microstructure was investigated by means of x-ray diffraction (XRD), scanning electron microscope (SEM) combined with energy dispersive spectrometer (EDS), and field emission transmission electron microscope (FETEM). FETEM and EDS were also used to analyze the Ti(C,N)/304ss interface. Mechanical properties such as transverse rupture strength (TRS) and hardness were also measured. Results show that prolonged milling time decreases the Ti(C,N) grain size and improves the homogeneity of microstructure. As a consequence, the frequency of intergranular fracture increased and it can improve the mechanical properties. Fe and Ti elements could interdiffuse and the hard phase was closely bonded with binder phase. The Ti(C,N)/Ti(C,N) interface was weaker than Ti(C,N)/304ss interface. Results also show that the transverse rupture strength and the hardness increase with increasing milling time and the maximum values were obtained at 18 h with 1437 MPa and 83.7 HRA, respectively.

Keyword :

composite mechanical properties powder metallurgy microstructure cermet

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GB/T 7714 He, Lin , Gao, Yimin , Li, Yefei et al. Effect of milling time on the microstructure and mechanical properties of Ti(C,N)-304 stainless steel cermet [J]. | MATERIALS RESEARCH EXPRESS , 2018 , 5 (2) .
MLA He, Lin et al. "Effect of milling time on the microstructure and mechanical properties of Ti(C,N)-304 stainless steel cermet" . | MATERIALS RESEARCH EXPRESS 5 . 2 (2018) .
APA He, Lin , Gao, Yimin , Li, Yefei , Liu, Zhiwei , Zhai, Wenyan , Zhang, Weiyao . Effect of milling time on the microstructure and mechanical properties of Ti(C,N)-304 stainless steel cermet . | MATERIALS RESEARCH EXPRESS , 2018 , 5 (2) .
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Effect of milling time on powder's structure evolution of Ti(C,N)-304 stainless steel cermet SCIE Scopus
期刊论文 | 2018 , 5 (3) | MATERIALS RESEARCH EXPRESS
WoS CC Cited Count: 4 SCOPUS Cited Count: 6
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Abstract :

In this paper, Fe, Ni, Cr, Mn, Si, Celement powders and Ti(C,N) ceramic powder were used as starting materials to fabricate Ti(C,N)-304 stainless steel cermet via high-energy ball milling in argon atmosphere. Effect of milling time on powders' structure, including morphology of powder, average grain size, dislocation density and the solid solubility of Cr in Fe, were studied by x-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). XRD pattern shows that mechanical alloying was occurred during high energy ball milling. Nickel and chromium were gradually solid dissolved into iron and formed 304 stainless steel (304 s), the maximum solid solubility of Cr in Fe is 16.8 at.% obtained at 18 h. The mean grain size of Ti(C,N) particles and 304 s grains declined before 14 h and the minimum grain size of them were about 20 nm and 250 nm respectively, which is consistent with the results revealed by TEM images. The dislocation density in stainless steel powder increased with increasing milling time. After the powders were milled for 18 h, the cermet sintered at 1450 degrees C for 1 h has the maximum hardness (83.7 HRA) and relative density (93.3%).

Keyword :

cermet composite mechanical alloy microstructure powder metallurgy

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GB/T 7714 He, Lin , Gao, Yimin , Li, Yefei et al. Effect of milling time on powder's structure evolution of Ti(C,N)-304 stainless steel cermet [J]. | MATERIALS RESEARCH EXPRESS , 2018 , 5 (3) .
MLA He, Lin et al. "Effect of milling time on powder's structure evolution of Ti(C,N)-304 stainless steel cermet" . | MATERIALS RESEARCH EXPRESS 5 . 3 (2018) .
APA He, Lin , Gao, Yimin , Li, Yefei , Liu, Zhiwei , Huo, Xuxu , Zhai, Wenyan . Effect of milling time on powder's structure evolution of Ti(C,N)-304 stainless steel cermet . | MATERIALS RESEARCH EXPRESS , 2018 , 5 (3) .
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课堂讨论与同伴学习在工程材料基础课程教学的应用及效果评价
期刊论文 | 2017 , (17) , 175-177 | 教育教学论坛
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Abstract :

为了激发学生的学习兴趣,提高教学效果,在工程材料基础课程中采用课堂讨论和同伴学习的教学方式,并对不同教学方式的效果进行评价.课堂讨论使学生更能参与学习过程,增加其学习主动性.同伴教学由学生课前预习、观看教师上课视频、自学、同桌讨论结合等多种方式混合,也增加了学习的主动性,学习效果良好.

Keyword :

工程材料 同伴教学 课堂讨论 效果评价

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GB/T 7714 孙巧艳 , 王继平 , 王红洁 et al. 课堂讨论与同伴学习在工程材料基础课程教学的应用及效果评价 [J]. | 教育教学论坛 , 2017 , (17) : 175-177 .
MLA 孙巧艳 et al. "课堂讨论与同伴学习在工程材料基础课程教学的应用及效果评价" . | 教育教学论坛 17 (2017) : 175-177 .
APA 孙巧艳 , 王继平 , 王红洁 , 高义民 . 课堂讨论与同伴学习在工程材料基础课程教学的应用及效果评价 . | 教育教学论坛 , 2017 , (17) , 175-177 .
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Effect of milling time on microstructure and mechanical properties of Cu-Ni-graphite composites SCIE Scopus
期刊论文 | 2017 , 4 (9) | MATERIALS RESEARCH EXPRESS | IF: 1.151
WoS CC Cited Count: 3 SCOPUS Cited Count: 4
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Cu-Ni-graphite composites are intended for application in switch slide baseplate materials. The microstructure of the composites depends strongly on the ball milling time, and a suitable time can significantly improve the properties of the Cu-Ni-graphite composites. In this study, a two-step milling method was employed. The morphology evolution and microstructural features of the powder was characterized at different milling times. Afterwards, the Cu-Ni-graphite composites were prepared in the process of cold pressing, sintering, re-pressing and re-sintering as a function of the different milling times. Finally, both the microstructure and mechanical properties of the Cu-Ni-graphite composites are discussed. The results show that no new phase was generated during the milling process. The morphology evolution of the mixture of Cu/Ni powder changed from spherical-like to cubic-like, plate-like and flake-like with an increasing milling time. The microstructure of the composites consisted of a-phase and graphite. The boundary area and quantity of pores changed as the milling time increased. The relative density, hardness and flexural strength reached maximum values at 15 h of milling time.

Keyword :

Cu-Ni-graphite composites microstructure characterization milling time

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GB/T 7714 Wang, Yiran , Gao, Yimin , Li, Yefei et al. Effect of milling time on microstructure and mechanical properties of Cu-Ni-graphite composites [J]. | MATERIALS RESEARCH EXPRESS , 2017 , 4 (9) .
MLA Wang, Yiran et al. "Effect of milling time on microstructure and mechanical properties of Cu-Ni-graphite composites" . | MATERIALS RESEARCH EXPRESS 4 . 9 (2017) .
APA Wang, Yiran , Gao, Yimin , Li, Yefei , Zhang, Chao , Huang, Xiaoyu , Zhai, Wenyan . Effect of milling time on microstructure and mechanical properties of Cu-Ni-graphite composites . | MATERIALS RESEARCH EXPRESS , 2017 , 4 (9) .
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Microstructure and tribological properties of NiCrAlY-Mo-Ag composite by vacuum hot-press sintering EI SCIE Scopus
期刊论文 | 2017 , 143 , 1-6 | VACUUM | IF: 2.067
WoS CC Cited Count: 2 SCOPUS Cited Count: 2
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Abstract :

The NiCrAIY-Mo-Ag composite was fabricated by vacuum hot-pressing sintering. The friction and wear behaviour of the composite were investigated from room temperature to 900 degrees C. Furthermore, the wear mechanism was studied over this wide range of temperatures. At the same time, the compressive properties of the composite were researched. The composition and microstructure of the composite were analyzed by X-ray diffraction (XRD) and scanning election microscopy (SEM). At 700 degrees C and 900 degrees C, the tribo-chemical reaction occurred on the worn surface and formed a high-temperature tribo-layer based on NiO and silver molybdates, which could effectively reduce the friction coefficient and wear rate of the composite. The existence of broken particles and the pullout of hard phase particles were seen on the fracture surface of the composite, which were determined by the interfacial bonding strength. (C) 2017 Elsevier Ltd. All rights reserved.

Keyword :

Wear mechanism Bonding strength High temperature Hot-pressing sintering Compressive properties

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GB/T 7714 Li, Bo , Gao, Yimin , Han, Minmin et al. Microstructure and tribological properties of NiCrAlY-Mo-Ag composite by vacuum hot-press sintering [J]. | VACUUM , 2017 , 143 : 1-6 .
MLA Li, Bo et al. "Microstructure and tribological properties of NiCrAlY-Mo-Ag composite by vacuum hot-press sintering" . | VACUUM 143 (2017) : 1-6 .
APA Li, Bo , Gao, Yimin , Han, Minmin , Guo, Hongjian , Wang, Wenzhen , Jia, Junhong . Microstructure and tribological properties of NiCrAlY-Mo-Ag composite by vacuum hot-press sintering . | VACUUM , 2017 , 143 , 1-6 .
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Effect of molybdenum addition on the microstructure and mechanical properties of Cr3C2-20 wt. % Ni cermet EI SCIE Scopus
期刊论文 | 2017 , 34 (4) , 272-278 | MATERIALS AT HIGH TEMPERATURES | IF: 1.423
WoS CC Cited Count: 1 SCOPUS Cited Count: 3
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Abstract :

Effect of Mo addition on the microstructure and mechanical properties of Cr3C2-20 wt. % Ni cermet was investigated. Three different phases can be seen in the microstructure after adding appropriate molybdenum. The completely undissolved (Cr, Mo)(3)C-2 phase maintains the original grain size and effectively prevents the (Cr, Mo)(7)C-3 grains from merging and growing. The relative densities of the sintered specimens decrease slightly, while the hardness and bending strength increase firstly and then decrease slightly with the increase of Mo content. The maximum values of the hardness (88.6 HRA) and bending strength (1200 MPa) are achieved with 1 wt. % Mo addition.

Keyword :

mechanical properties microstructure molybdenum Cr3C2 cermet

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GB/T 7714 Zhai, Wenyan , Gao, Yimin , Sun, Liang et al. Effect of molybdenum addition on the microstructure and mechanical properties of Cr3C2-20 wt. % Ni cermet [J]. | MATERIALS AT HIGH TEMPERATURES , 2017 , 34 (4) : 272-278 .
MLA Zhai, Wenyan et al. "Effect of molybdenum addition on the microstructure and mechanical properties of Cr3C2-20 wt. % Ni cermet" . | MATERIALS AT HIGH TEMPERATURES 34 . 4 (2017) : 272-278 .
APA Zhai, Wenyan , Gao, Yimin , Sun, Liang , Xiao, Yuelei , He, Lin , Wang, Yiran . Effect of molybdenum addition on the microstructure and mechanical properties of Cr3C2-20 wt. % Ni cermet . | MATERIALS AT HIGH TEMPERATURES , 2017 , 34 (4) , 272-278 .
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Investigation of the Corrosion Behavior of Electroless Ni-P Coating in Flue Gas Condensate SCIE
期刊论文 | 2017 , 7 (1) | COATINGS | IF: 2.35
WoS CC Cited Count: 3
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Abstract :

The corrosion behavior of Ni-P coating deposited on 3003 aluminum alloy in flue gas condensate was investigated by electrochemical approaches. The results indicated that nitrite acted as a corrosion inhibitor. The inhibiting effect of nitrite was reduced in solutions containing sulfate or nitrate. Chloride and sulfate accelerated the corrosion of Ni-P coatings greatly. This can provide important information for the researchers to develop special Ni-P coatings with high corrosion resistance in the flue gas condensate.

Keyword :

flue gas condensate pitting corrosion anion 3003 aluminum alloy electroless Ni-P coating

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GB/T 7714 Yang, Hejie , Gao, Yimin , Qin, Weichao . Investigation of the Corrosion Behavior of Electroless Ni-P Coating in Flue Gas Condensate [J]. | COATINGS , 2017 , 7 (1) .
MLA Yang, Hejie et al. "Investigation of the Corrosion Behavior of Electroless Ni-P Coating in Flue Gas Condensate" . | COATINGS 7 . 1 (2017) .
APA Yang, Hejie , Gao, Yimin , Qin, Weichao . Investigation of the Corrosion Behavior of Electroless Ni-P Coating in Flue Gas Condensate . | COATINGS , 2017 , 7 (1) .
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Prediction on structural, mechanical and thermal properties of Al4SiC4, Al4C3 and 4H-SiC under high pressure by first-principles calculation SCIE Scopus
期刊论文 | 2017 , 31 (9) | MODERN PHYSICS LETTERS B | IF: 0.731
WoS CC Cited Count: 4 SCOPUS Cited Count: 6
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A theoretical study is conducted by first-principles theory to study the structural, electronic, elastic and thermal properties of Al4SiC4, Al4C3 and 4H-SiC phases under pressure. The calculated results indicated that the volumetric shrinkage of Al4SiC4 declines to 16% compared with 4H-SiC for 12% and its length of lattice parameter along c-axis decreases faster than that of along other axes in cell structures. The mechanical properties of Al4SiC4 like elastic constants and elastic moduli increase continuously under pressure. The thermal expansion coefficient of three compounds under pressure are studied first. When temperature is lower than 500 K, the coefficient increases rapidly first then gradually tends to a linear accession at higher temperature and the propensity of increment becomes moderate. The C-V data decreases slightly with pressure but increases dramatically with temperature for all compounds.

Keyword :

elastic behavior Al4SiC4 thermal expansion coefficient heat capacity

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GB/T 7714 Sun, Liang , Gao, Yimin , Yoshida, Katsumi et al. Prediction on structural, mechanical and thermal properties of Al4SiC4, Al4C3 and 4H-SiC under high pressure by first-principles calculation [J]. | MODERN PHYSICS LETTERS B , 2017 , 31 (9) .
MLA Sun, Liang et al. "Prediction on structural, mechanical and thermal properties of Al4SiC4, Al4C3 and 4H-SiC under high pressure by first-principles calculation" . | MODERN PHYSICS LETTERS B 31 . 9 (2017) .
APA Sun, Liang , Gao, Yimin , Yoshida, Katsumi , Yano, Toyohiko , Wang, Wen . Prediction on structural, mechanical and thermal properties of Al4SiC4, Al4C3 and 4H-SiC under high pressure by first-principles calculation . | MODERN PHYSICS LETTERS B , 2017 , 31 (9) .
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