Development of Viscometer for Semi-solid Metals

Zhang Xiannian Zhang Henghua Shao Guangjie Xu Luoping

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Development of Viscometer for Semi-solid Metals
Issue 8, Pages: 507-510(2005)
Published： 2005 ，
DOI：

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[1]张先念,张恒华,邵光杰,许珞萍.半固态金属流变仪的研制[J].特种铸造及有色合金,2005(08):507-510+448.

Zhang Xiannian Zhang Henghua Shao Guangjie Xu Luoping. Development of Viscometer for Semi-solid Metals. [J]. Special Casting & Nonferrous Alloys (8):507-510(2005)
[1]张先念,张恒华,邵光杰,许珞萍.半固态金属流变仪的研制[J].特种铸造及有色合金,2005(08):507-510+448. DOI：

Zhang Xiannian Zhang Henghua Shao Guangjie Xu Luoping. Development of Viscometer for Semi-solid Metals. [J]. Special Casting & Nonferrous Alloys (8):507-510(2005) DOI：

摘要

根据同轴圆筒旋转法粘度测量原理自行研制了1台半固态金属流变仪

并通过测量甘油的粘度来检验流变仪的测量精度。在3个不同温度下测得的甘油绝对粘度值与标准值接近。用该台流变仪研究半固态A356铝合金的流变特性表明:半固态浆料稳态表观粘度随着剪切速率的增大而下降

且浆料温度越低

伪塑性越明显;当固相率小于10%时

在高剪切速率下浆料呈现出牛顿流体的特征;在连续冷却条件下

半固态浆料的表观粘度随着温度的降低而先缓慢后迅速增大

冷却速度显著影响半固态合金的表观粘度。

Abstract

A searler viscometer for semi-sold metal has been developed based on the measurement principle of co-axial cylinder rotating.Measuring precision of the viscometer can be verified by measuring viscosity of the glycerin.The measured values are identical with the data from the literature at three different temperatures.The rheological behavior of the semi-solid A356 aluminum alloy slurry was examined by the viscometer.The results shows that the apparent viscosity of A356 aluminum alloy in steady-state decrease with the increase of the shear rate under isothermal shearing condition.The lower the temperature of the slurry is

the more obvious the pseudo-plasticity is.The slurry exhibits Newtonian manner at high shear rate with lower than 10% solid volume fraction.During the continuous shearing at a constant shear rate

the apparent viscosity gradually increase at begin

then sharply increase with temperature decrease.The cooling rate has a remarkable effect on the apparent viscosity of the semi-solid alloy slurry.