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| 1 | FRACTURE MECHANISM AND MICROMECHANICAL ANALYSIS OF POLYSYNTHETICALLY TWINNED CRYSTALS OF γTiAl ALLOYS显示文摘The fracture behavior and mechanism of PST crystals of a Ti 49%(mole fraction)Al alloy have been studied by using in situ straining and micromechanical calculation. The three dimensional micromechanical model representing the structure of PST crystal has been built, and the stress distribution ahead of the sharp and blunt crack tips either parallel to lamellar interface or perpendicular to the lamellae has been calculated by using finite element method based on linear elasticity of PST crystals. The experimental results show that the fracture behaviors and mechanisms are strongly dependent on the angle of loading axis to the lamellae. The calculation indicates that nucleation and propagation of microcrack along the interfaces are controlled by the normal stress and translamellar microcrack is controlled by shear stress ahead of crack tip. | Y.G.Zhang, Y.H.Lu, G.K.Hu * and C.Q.Chen Department of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics Unversity, Beijing 100083,China * Department of Applied Mechanics, Beijing Institute of Technology, | 1999 | 中国有色金属学会会刊:英文版1999，9，S1： | 3 |
| 2 | Network structured SnO2/ZnO heterojunction nanocatalyst with high photocatalytic activity显示文摘 | L.R.Zheng Y.H.Zheng C.Q.Chen Y.Y.Zhan X.Y.Lin Q.Zheng K.M.Wei J.F.Zhu | | 0，，： | 1 |
| 3 | Effect of Sintering Temperature on Microwave Absorbing Behaviour of Mn-Zn Ferrite显示文摘The microwave absorbing behaviour of Mn-Zn ferrite sintered at 1100,1200,1300,1400 and1500℃ has been investigated.The phase constitution of the ferrite was analyzed by X-raydiffraction.The results show that the ferrite sintered at 1 500℃ has better microwave absorbing prop-erty than those prepared at other temperatures,due to the increase of turbulent loss generated by theformation of excessive Fe2+ in deoxidizing of Fe2O3 at high temperatures. | Yongxue GAN Pei YI Changqi CHEN (C.Q.Chen) Dept.of Mater.Sci.Eng.,Beijing University of Aeronautics and Astronautics,Beijing 100083,China | 1993 | Journal of Materials Science & Technology1993，9，5： | 0 |
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