THE APPARENT VISCOSITY OF SEMI-SOLID AZ91D ALLOY AT STEADY STATE
来源期刊：Acta Metallurgica Sinica2002年第6期
论文作者：S.J.Yan W.M.Mao C.L.CuI Z.S.Zhen X.Y.Zhong A.M.Zhao
Key words：Rheological behavior; magnesium alloy; semi-solid; viscosity; vis-cometer;
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.
S.J.Yan1，W.M.Mao1，C.L.CuI1，Z.S.Zhen1，X.Y.Zhong1，A.M.Zhao1
(1.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083,China)
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.
Key words:Rheological behavior; magnesium alloy; semi-solid; viscosity; vis-cometer;
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