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《Journal of Heilongjiang Institute of Technology》 2002-01
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Nonlinear Microstructural Constitutive Equation of Nanocrystalline Metals

WANG Biao,LIU Yu-lan (Electro-Optics Technology Center,Harbin Institute of Technology,Harbin150001,China)  
Based on experimental observation,in the current study,nanocrystalline materials are moeled as composite systems in which the amorphous interfacial phase is treated as the matrix,whereas the inclusions are the nano-scale single crystals.As the elastic moduli of the nanoscale crystals are higher in general than those of the amorphous matrix,the deformation mechanism of the materials depends heavily on the size of the crystals.For macro size crystal materials,such as coarse-grained polycrystalline materials,the deformation mechanism due to dislocation movement is dominant.Whereas when the crystal size is reduced below a certain critical value,the plastic deformation mechanism is due to the shear banding will be dominant in the amorphous matrix.According to such deformation mechanism,an internal variable s\constitutive theory is introduced to develop a general constitutive equation for the nanocrystalline materials.The model reveals some special characteristics of the relation be-tween the yield strength and the grain size.It also predicts the kinematic hardening behavior of nanocrystalline metals.
【Fund】: 国家自然科学基金(10172030);; 黑龙江省自然科学基金资助。
【CateGory Index】: TB383
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