THE APPARENT VISCOSITY OF SEMI-SOLID AZ91D ALLOY AT STEADY STATE

金属学报(英文版), 2002, 15(6): 505-510.

^1, , ^2, , ^3, , ^4, , ^5, , ^6,

1.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083,China

2.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083,China

3.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083,China

4.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083,China

5.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083,China

6.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083,China

基金项目: 国家重点基础研究发展计划(973计划)(G2000067202)

THE APPARENT VISCOSITY OF SEMI-SOLID AZ91D ALLOY AT STEADY STATE

Keywords： Rheological behavior

The Rheological behavior of semi-solid AZ91D at steady state is studied using a Couettetype viscometer in the present paper. The results show that the apparent viscosity ofsemi-solid AZ91D at the steady state increases with the solid fraction increasing, andgoes up sharply when the solid fraction reaches a certain value, which is called criticalfraction. In addition, the apparent viscosity of semi-solid AZ91D at the steady statetakes on a distinct downtrend with the shearing rate increasing, which indicates astrong shear thinning property. In addition, the critical solid fraction becomes higherunder larger shearing rate, owing to the more globular shape of the solid particles.Based on the present experiment results, an empirical equation is built as that, relatingthe steady state apparent viscosity of semi-solid AZ91D with the solid fraction fs andshearing rate γ at the same time: ηapp=10. 74exp(6.95fs)γ-0.86.

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THE APPARENT VISCOSITY OF SEMI-SOLID AZ91D ALLOY AT STEADY STATE

参考文献