共搜索到9569条信息，每页显示10条信息，共957页。用时：0小时0分0秒486毫秒
Growth mechanism of Cu nanopowders prepared by anodic arc plasma WEI Zhi-qiang(魏智强)1, 2, XIA Tian-dong(夏天东)2, MA Jun (马 军)1, DAI Jian-feng(戴剑锋)1, FENG Wang-jun(冯旺军)1, WANG Qing (王 青)1, YAN Peng... discharging plasma method, and the mechanism of particle nucleation and growth was investigated. In addition, the morphology, crystal structure, particle size and specific surface area of the nanopowders......
, depending on rate of nucleation and morphology of growth during the reaction, and k is the Avrami reaction rate constant, depending on thermal history of the reaction system. k is associated... of two reactions. For primary crystallization, the apparent activation energies, EIso and EKis and growth activation energies Eg are about 153, 166 and 288 kJ/mol, respectively. The interdiffusion......
J. Cent. South Univ. Technol. (2008) 15(s1): 322-325 DOI: 10.1007/s11771-008-372-5 Variation of yield stress of Daqing crude oil with pipelining history LI Li(李 立)1, HOU Lei(侯 磊)2, SUN Li-xin(孙... safety for the heated oil transported through pipeline. Daqing crude oil was studied and the variation of yield stress with shear history was explored through simulation experiment of pipelining......
......
J. Cent. South Univ. Technol. (2007)03-0310-05 DOI: 10.1007/s11771-007-0061-9 Template growth mechanism...; Abstract: The microstructures and growth process characteristics......
and the solidification behaviors were investigated by monitoring the temperature recalescence and examing the solidification microstructures. A boundary clearly exists, which separates the coupled growth zone from the decoupled growth zone of eutectic phases for the alloys with Sn content ranging from 14% to 31% (mole fraction). The other Co-Sn alloys out of this content range are hard to be undercooled......
Fracture toughness and fatigue crack growth analysis of 7050-T7451 alloy thick plate with different thicknessesWANG Yi-lin(王艺淋)1, PAN Qing-lin(潘清林)1, 2, WEI Li-li(韦莉莉)1, LI Bo(李波)1, WANG Ying(王迎)1(1... University), Changsha 410083, China)Abstract:The strength, fracture toughness and fatigue crack growth resistance of 7050-T7451 aluminum alloy plate with different thicknesses (35 mm and 160 mm) were......
Effects of Ni catalyzer on growth velocity and morphology of SiC nano-fibers XU Xian-feng(徐先锋)1, 2, XIAO Peng(肖 鹏)1, XIONG Xiang(熊 翔)1, HUANG Bai-yun(黄伯云)1 1. State Key Laboratory.... The resulting SiC-NFs appear more spindle-like and have a more homogeneous dispersion. The mass change of the samples before and after deposition shows that using more Ni granules results in a faster growth......
Phase field modeling of dendrite growth Chengzhi WANG1,Yiyi LI2,Yutuo ZHANG1,Dianzhong LI2 (1.Shenyang Ligong University,Shenyang 110168,China;2.Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China) Abstract:Single dendrite and multi-dendrite growth for A1-2 mol pct Si alloy during isothermal solidification are simulated by phase field method. In the case of single......
A NOVEL PARAMETER FOR EVALUATING THE FATIGUE CRACK GROWTH RATE IN CARBON STEELS H.Nisitani1,S.Q.Zhu2,N.KAWAGOISHI3,X.S.WANG2 (1.Faculty of Engineering,Kyushu Sangyuo University,Fukuoka,812,Japan... for evaluating the fatigue crack growth rate in carbonsteels.Fatigue crack propagation tests of an annealed 0.42% carbon steel were carriedout under different conditions to investigate the relationship between......
