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| 1 | Microstructure and mechanical properties of forged Al-7.1Zn-1.1Mg-1.6Cu-0.14Zr alloy after two-step ageing treatment at 120 and 170℃显示文摘The tensile properties,electrical conductivity,and microstructure of the forged Al-7.1Zn-1.1Mg-1.6Cu-0.14Zr alloy were investigated after a two-step ageing treatment at 120 and 170℃.The results indicate that the strength of the alloy reaches the peak value at 170℃ for 1 h during the second step ageing and then decreases sharply.However,the electrical conductivity value increases continuously with the second ageing time increasing.The fracture mechanism of the alloy is intergranular fracture for 1 h and then changes to dimple transgranular fracture later,and the toughness of the alloy is improved significantly.The phases of η' and η are major precipitates in the alloy under the two-step ageing condition.Discontinuous grain boundary precipitates and precipitate-free zones along the grain boundary are clearly observed. | WANG Shaohua ZHANG Xingguo YANG Shoujie FANG Canfeng HAO Hai DAI Shenglong | 2010 | Rare Metals2010，29，4： | 12 |
| 2 | Investigation of precipitation behavior and related hardening in AA 7055 aluminum alloy显示文摘 | Junzhou Chen Liang Zhen Shoujie Yang Wenzhu Shao Shenglong Dai | 2008 | Materials Science & Engineering A2008，，1： | 3 |
| 3 | Effects of trace Zr on the microstructure and properties of 2E12 alloy显示文摘Al-4.0Cu-1.4Mg-0.6Mn (2E12) and Al-4.0Cu-1.4Mg-0.6Mn-0.3Zr aluminum billets were manufactured by soft-contact electromagnetic continuous casting (EMC). Subsequent forging and heat treatment were conducted and the effects of Zr on the microstructure and properties of the Al-4.0Cu-1.4Mg-0.6Mn alloy were studied. The results show that the addition of 0.3% Zr can reduce the dendrite and refine grains. During forging and solution treatment, fine and dispersive Al3Zr particles precipitated from the supersaturated α (Al) solid solution in the heating process of the billet can effectively pin dislocations and subgrain boundaries. Because of the addition of Zr, the mechanical properties are improved with the tensile strength, yield strength, elongation, and contraction of the area increasing by 5.4%, 11.3%, 9.7%, and 12.6%, respectively. Moreover, under the condition of R = 0.1, the fatigue crack growth rate (da/dN) of the Al-4.0Cu-1.4Mg-0.6Mn-0.3Zr alloy is lower than that of the Al-4.0Cu-1.4Mg-0.6Mn alloy. | WANG Jianzhao FANG Canfeng HAO Hai WANG Shaohua YANG Shoujie DAI Shenglong ZHANG Xingguo | 2009 | Rare Metals2009，28，5： | 2 |
| 4 | The Potential Vertical Distribution of Bigeye Tuna (Thunnus obesus) and Its Influence on the Spatial Distribution of CPUEs in the Tropical Atlantic Ocean显示文摘Understanding the potential vertical distribution of bigeye tuna(Thunnus obesus) is necessary to understand the catch rate fluctuations and the stock assessment of bigeye tuna. To characterize the potential vertical distribution of this fish while foraging and determine the influences of the distribution on longline efficiency in the tropical Atlantic Ocean, the catch per unit effort(CPUE) data were compiled from the International Commission for the Conservation of Atlantic Tunas and the Argo buoy data were downloaded from the Argo data center. The raw Argo buoy data were processed by data mining methods. The CPUE was standardized by support vector machine before analysis. We assumed the depths with the upper and lower limits of the optimum water temperatures of 15℃ and 9℃ as the preferred swimming depth, while the lower limit of the temperature(12℃) associated with the highest hooking rate as the preferred foraging depth(D12) of bigeye tuna during the daytime in the Atlantic Ocean. The preferred swimming depth and foraging depth range in the daytime were assessed by plotting the isobath based on Argo buoy data. The preferred swimming depth and vertical structure of the water column were identified to investigate the spatial effects on the CPUE by using a generalized additive model(GAM). The empirical cumulative distribution function was used to assess the relationship between the spatial distribution of CPUE and the depth of 12℃ isolines and thermocline. The results indicate that 1) the preferred swimming depth of bigeye tuna in the tropical Atlantic is from 100 m to 400 m and displays spatial variation;2) the preferred foraging depth of bigeye tuna is between 190 and 300 m and below the thermocline;3) the number of CPUEs peaks at a relative depth of 30 –50 m(difference between the 12℃ isolines and the lower boundary of the thermocline);and 4) most CPUEs are within the lower depth boundary of the thermocline levels(LDBT) which is from 160 m to 230 m. GAM analysis indicates that the general relationship between the nominal CPUE and LDBT is characterized by a dome shape and peaks at approximately 190 m. The oceanographic features influence the habitat of tropical pelagic fish and fisheries. Argo buoy data can be an important tool to describe the habitat of oceanic fish. Our results provide new insights into how oceanographic features influence the habitat of tropical pelagic fish and fisheries and how fisheries exploit these fish using a new tool(Argo profile data). | YANG Shenglong SONG Liming ZHANG Yu FAN Wei ZHANG Bianbian DAI Yang ZHANG Heng ZHANG Shengmao WU Yumei | 2020 | Journal of Ocean University of China2020，19，3： | 1 |
| 5 | Nucleation and Formation of Stable and Metastable Phases in Undercooled AI-Li Melts显示文摘A modified nucleation and competitive growth kinetic theory considering unsteady nucleation andeffect of composition in dilute binary alloys was suggested,based on which the selections of δ.δ’and α phases in undercooled Al-Li melts were summarized by both isothermal and continuous cool-ing treatment methods. | Shenglong DAI Guifu YU Minggao YAN Institute of Aeronautical Materials,Beijing,100095,China | 1993 | Journal of Materials Science & Technology1993，9，3： | 0 |
| 6 | A New Dispersion-strengthening Phase in an Aged RST Al-8Fe-2Mo-2Zr-2Nd-0.7Ti-1.6Si Alloy显示文摘An effective dispersion-strengthening phase in Al-8Fe-2Mo-2Zr-2Nd-0.7Ti-1.6Si alloy wasidentified to be an aged precipitate phase with possible chemical stoichiometry of Al20(Ti,Mo)2 Ndand fcc crystal structure with ao=1.455 nm.The structure was determined to be Fm3m space group. | Shenglong DAI Guifu YU Minggao YAN Institute of Aeronautical Materials,Beijing,100095,China | 1993 | Journal of Materials Science & Technology1993，9，4： | 0 |
| 7 | Properties of ABS/Organic-Attapulgite Nanocomposites Parts Fabricated by Fused Deposition Modeling显示文摘The paper discusses the mechanical and thermal performance manifested in natural nanorods attapulgite(ATP)reinforced Acrylonitrile butadiene styrene(ABS)nanocomposites in the process of fused deposition modeling(FDM).Molten extrusion technique was taken to manufacture the filaments of ABS/organic-attapulgite(OAT)nanocomposites with different mass fraction and the printing operation was made by one commercial FDM three-dimensional(3D)printer.Results indicate that the mechanical performance of these FDM 3D printed specimens are improved obviously via the introduction of OAT,and tensile strength of the ABS/OAT nanocomposites parts with only 2 wt%OAT addition is enhanced by 48.1%.At the same time,the addition OAT can reduce the linear expansion coefficient and creep flexibility,and improve the thermal stability and dimensional accuracy of these FDM 3D printed parts. | Ling Wang Shenglong Jiang Chenchen Huang Pengyuan Dai Fenghua Liu Xiaopeng Qi Gaojie Xu | 2020 | Journal of Renewable Materials2020，8，11： | 0 |
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