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Energy Dissipation and Apparent Viscosity of Semi-solid Metal during Rheological Processes Part Ⅱ: Apparent Viscosity
作者姓名:Wen  LIU  Shuming  XING  Peiwei  BAO  Milan  ZHANG  Liming  XIAO
作者单位:Beijing Jiaotong University, Beijing 100044, China
摘    要:This study investigated the rheological properties of semi-solid metal. An analytical model of apparent viscosity was built up based on analysis of energy dissipation during rheological processes such as slurry preparing, delivering and model filling. The rheological properties of SSM (semi-solid metal) slurry was described by an analytical model in terms of microstructural parameters, which consist of effective solid fraction, particle size and shape, and flow parameters such as mean velocity, fluctuant velocity and relative velocity between liquid and solid phase. The model was verified in the experiment of A356 alloys with a coaxial double-bucket rheometer. And the maximum relative error between the theoretical value and measured one is less than 20%. The results of experiment and theoretical calculation also indicate that the microstructural parameters and flow parameters are two major factors that affect the apparent viscosity of semi-solid alloys, and fluctuant velocity and relative velocity between liquid and solid phase are the key factors to distinguish between steady and transient rheological properties.

关 键 词:半固体金属  黏度  流变学  模型
收稿时间:2006-11-13
修稿时间:2006-11-13

Energy Dissipation and Apparent Viscosity of Semi-solid Metal during Rheological Processes Part II: Apparent Viscosity
Wen LIU Shuming XING Peiwei BAO Milan ZHANG Liming XIAO.Energy Dissipation and Apparent Viscosity of Semi-solid Metal during Rheological Processes Part II: Apparent Viscosity[J].Journal of Materials Science & Technology,2007,23(6):801-805.
Authors:Wen LIU  Shuming XING  Peiwei BAO  Milan ZHANG  Liming XIAO
Affiliation:Beijing Jiaotong University, Beijing 100044, China
Abstract:This study investigated the rheological properties of semi-solid metal. An analytical model of apparent viscosity was built up based on analysis of energy dissipation during rheological processes such as slurry preparing,delivering and model filling. The rheological properties of SSM (semi-solid metal) slurry was described by an analytical model in terms of microstructural parameters, which consist of effective solid fraction, particle size and shape, and flow parameters such as mean velocity, fluctuant velocity and relative velocity between liquid and solid phase. The model was verified in the experiment of A356 alloys with a coaxial double-bucket rheometer. And the maximum relative error between the theoretical value and measured one is less than 10%.The results of experiment and theoretical calculation also indicate that the microstructural parameters and flow parameters are two major factors that affect the apparent viscosity of semi-solid alloys, and fluctuant velocity and relative velocity between liquid and solid phase are the key factors to distinguish between steady and transient rheological properties.
Keywords:Semi-solid metal  Apparent viscosity  Energy dissipation  Rheology  Model
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