Vdl.20'o.4 陈晓阳等：半固态合金浆料挤压变形的液相偏析模型 ·343· (4)液相相对于固相的相对运动导致液相偏析，细化固相颗粒和降低固相体积分数均可 降低液相偏析， 参考文献 I Flemings M C.Behavior of Metal Alloys in the Semi-solid State.Metall Trans A,1991.22:957 2 Girot FA.Albingre L,Quenissot J M,Naslain R.Rheocasting Al Matrix Composites.J Met.1987. 11:18 3 Taha M A,Suery M.Structure Characteristics and Extrusion Behavior of Pb-Sn Alloys in Semi- solid State.Met Tech,1984,11:226 4 Nur A,Byerlee J D.A Model for Deforation and Segregation of Solid-liquid Mixtures.J Geophys Res,1971.76:6414 S Kuhn H A.Downey C L Deformation Characteristics and Plasticity Theory of Sintered Powder Materials.Int J of Powder Met.1971,7:15 6 Suery M,Flemings M C.Effect of Strain Rate on Deformation Behavior of Semi-solid Dendritic Alloys.Metall Trans,1982.13A:1809 7 Shima S.Dyane M.Plasticity Theory for Ductile Metals.Int J of Mech Sci.1976,18:285 8 Charreyron P O.Flemings M C.Rheology of Semi-solid Dendritic Sn-Pb Alloys at Low Strain Rates.Int J Mech Sci,1985,27:781 9 Zavaliangos A,Anand L.Thermo-Elastic-Viscoplasticity of Porous Isotropic Metals.J Mech Phys Solids.1993.4:1087 Model for Liquid Segregation of Semi-solid Alloy Slurry in Extrusion Deformation Chen Xiaovang Mao Weimin Zhong Xueyou Matenals Science and Engineering School,UST Beijing,Beijing 100083.China ABSTRACT A mathematical model of axisymmetric compression of semi-solid alloy slurry was described.The model is applicable to conditions where the solid and liquid phases may be contiguous and their deformation behaviors are coupled.The densification of the solid skeleton drives the fluid flow behavior.and the resulting pressure distribution in the liquid affects the densification in the solid and the liquid phase segregation.The model can predict radial distribution of liquid fraction of semi-solid alloy slurry specimen. KEY WORDS semi-solid alloy slurry;extrusion deformation;liquid phase segregation model