| THE APPARENT VISCOSITY OF SEMI-SOLID AZ91D ALLOY AT STEADY STATE |
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| 作者姓名： | Z.S. Zhen W.M. Mao S.J. Van A.M. Zhao C.L. Cui and X.Y. ZhongSchool of Materials Science and Engineering University of Science and Technology Beijing Beijing China |
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| 作者单位： | Z.S. Zhen，W.M. Mao，S.J. Van，A.M. Zhao，C.L. Cui and X.Y. ZhongSchool of Materials Science and Engineering，University of Science and Technology Beijing，Beijing 100083，China |
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| 基金项目： | The present study was supported by the National Key Basic Research and Development Programme of China (Project No. G2000067202). |
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| 摘 要： | The rheological behavior of semi-solid AZ91D at steady state is studied using a Couette type viscometer in the present paper. The results show that the apparent viscosity of semi-solid AZ91D at the steady state increases with the solid fraction increasing, and goes up sharply when the solid fraction reaches a certain value, which is called critical fraction. In addition, the apparent viscosity of semi-solid AZ91D at the steady state takes on a distinct downtrend with the shearing rate increasing, which indicates a strong shear thinning property. In addition, the critical solid fraction becomes higher under 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, relating the steady state apparent viscosity of semi-solid AZ91D with the solid fraction fs andshearing rate (?) at the same time: ηapp=10.74exp(6.95fs)(?)-0.86.
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| 收稿时间： | 2002-02-27 |
| 修稿时间： | 2002-05-27 |
THE APPARENT VISCOSITY OF SEMI-SOLID AZ91D ALLOY AT STEADY STATE |
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| Z.S. Zhen,W.M. Mao,S.J. Van,A.M. Zhao,C.L. Cui and X.Y. ZhongSchool of Materials Science and Engineering,University of Science and Technology Beijing,Beijing ,China.THE APPARENT VISCOSITY OF SEMI-SOLID AZ91D ALLOY AT STEADY STATE[J].Acta Metallurgica Sinica(English Letters),2002,15(6):505-510. |
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| Authors: | ZSZhen WMMao SJYan AMZhao CLCuI XYZhong |
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| Affiliation: | School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083,China |
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| Abstract: | 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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| Keywords: | rheological behavior magnesium alloy semi-solid viscosity vis-cometer |
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