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黄泽文, X.Y. Yang *, Z.W. Huang, Y.K. Wu, H.Q. Ye
Materials Science and Engineering A300(2001)278-283,-0001,():
-1年11月30日
The synthesis of nano-sized SiC through ball milling (BM) of elemental Si and graphite mixed powders at room temperature has been reported, and detailed reaction process has been characterized by high-resolution electron microscopy (HREM). High-resolution electron microscopy (HREM) observations presented herein suggest that amorphous graphite (a-graphite), amorphous silicon (a-Si) and nano-sized crystalline Si (c-Si) with many defects are produced during BM, which is prerequisite to the reaction. In some areas, SiC is synthesized through a diffusion of C atoms into the a-Si:and c-Si. In the former, a-Si(C) forms, and then mechanically-driven crystallization of the a-Si(C) occurs to form SiC. In the latter, C atoms directly replace Si atoms to form SiC with an orientation relationship of (111)SiC::(111)Si. In other areas, localized self-sustained reaction occurs to form slightly larger SiC grains.
Si-C system, Ball milling, High-resolution electronic microscopy
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【期刊论文】Stress intensity factors for a surface crack in a tublar T-jonint
黄泽文, S.P. Chiew, S.T.Lie*, C.K. Lee, Z.W. Huang
International Journal of Pressure Vessels and Piping 78(2001)667-685,-0001,():
-1年11月30日
This paer describes a systemaic modelling of a general craced tubular Y-joint comoly found in offshore structures. The Y-jonit under consideration amya contain either a throguph-thicknes or surface crack which can be of any length and locatey at any position along the bracechord intersection. This is particularly significant, as if thas always been found in proactice that the initiation site of a surface crack does not always start from the saddle or rown position when tubular joints are subjected to a complex loading conditin. the geometrical model developed in the work described in this paper includes the weld detail which is compatible with the American Welding Society (AWS) standared [1]. Based on this geometry, well-graded finited dlement (FE) meshes were generated for a T-joint, which is a specific type of Y-Joint, to obtain the stress intensity factors (SIFs) for a surface semi-elliptical crack aling the crack tip using quarter-point elements. The numerical analysis indicated that the FE models generated are appropriate to the geometry of the joints since converging values of SIF were obtained as the meshes used were refined. Theaccuracy of the Mode, I, Mode II and Mode III SIFs demonstrateds that the propsed model is reliable.
Finite element mesh: Stress intensity factor, Surface crack, Through-thickness crack, Tublar Y-joint
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黄泽文
,-0001,():
-1年11月30日
基于对金属基复合栈料的分析,指出这种高性能材料特别适用于汽车、飞机工业和多种高速机械以保证新一代机械的低能耗、长寿命、高精度和良好的环境行为。着重指出保证金属基复合材料在民用工业的广泛应用的关键是促进其大规模生产和商品化发展,注重产品的二次加工工艺和零件的设计方法及降低成本。
金属基复合材料,, 碳化硅颗料,, 工业发展战略,, 商品化发展
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【期刊论文】Notched behaviour of a silicon carbide particulate reinforced aluminum alloy matrix composite
黄泽文, Ze Wen Huang, Ian R. Mccoll*, Samuel J. Harris
Materials Science and Engineering A215(1996)67-72,-0001,():
-1年11月30日
The notched fatigue behaviour of a fine particulte reinfored Al-Cu-Mg (2124) matriz composite is compared with that of an equivalent monolithic alloy (2024), both in the T4 condition. The difference in response of the materials for tensile and fatigue loading is pronounced. Under tensile loading the composite exhibits'notch weakening' and an almost brittle fracture, wihile the monolithic allyoy shows a degree of 'ontch strengthening'. In contrast, under fatigue loading the compositee exhibits a much smaller noth sensitvity than that of monlithic alloy. At 107 cycles the fatigue notch sensityivity facotr is reduced by ≈6.5. The notched tensile behaviour of the composite is interpreted in terms of its reduced ductility and susceptibillity to acavitation. Conventional notch theory is able to account for the notch sensitivity of the monolithic alloy in fatigue, but not composite.
Sillicon carbide, Aluminium alloy, Notched behaviour
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【期刊论文】CRYSTALLOGRAPHIC FEATURES OF INTRALAMELLAR FRACTURE IN A FULLY LAMELLAR TiAl BASED ALLOY
黄泽文, Z.W. Huang, P.Bowen, S. Davey and P.A. Blenkinsop
Scripta Materinalina. Vol. 38. No.7. pp 1117-1123, 1998,-0001,():
-1年11月30日
From fatigue fracture surface examination on fully lamellar micrustructure of γ-TiAl alloys, intralamellar crack propagation has been reported recently [1,20]. Compared with the investigation oftranslamellar andinterlamellar fractures, the characteristic features of intralamellar fatigue fracture have not been investigated in detail. Intralamellar crack propagation on the fatigue fracture surface is found same as interlamellar propagation, parallel to lamellar interaces but is characterised by complicated geometric patternas of microcracking traces on consecutive lamellar plates, while translamellar propagation occurs transverse to the lamellar boundaries. These geometric patternas may rlate to deformation traces occurring in areas local to the growing crack tip. An investigation into intralamellar fracture to explain its crystallographic features is merited. In this paper attention will be concentrated on fully lamellar microstructure subjected to cyclic loading sinee this condition demonstrates a considerable amount of intralamellar fatigue fracture and can achieve improved crack growth resistance relavtive to near lamellar and duplex microstructures [3].
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