A method for measuring the viscosity of metal semi-solid slurry with high solid phase ratio

Abstract

The invention relates to a method for measuring the viscosity of high-solid-fraction metal semi-solid slurry, and belongs to the field of metal melt viscosity measurement. According to the method, the high-solid-fraction metal semi-solid slurry is subjected to compressive deformation by using a thermo-mechanical simulation testing machine, so that the stress-strain curve of the deformation process is obtained; then, the measurement result is corrected, and mathematical formulas are used to figure out the viscosity of the metal semi-solid slurry; specifically, the method includes the following steps: (1) preparing a viscosity measurement test sample; (2) carrying out thermal compression and recording data; (3) correcting data and calculating the viscosity. The method adopts an existing metal material thermo-mechanical simulation testing machine to measure the quantitative relation between the deformation resistance and deformation during the compression process of the high-solid-fraction metal semi-solid slurry; the viscosity of the metal semi-solid slurry at a certain shearing rate is obtained through the corrected measurement result and mathematical conversion formulas.

Description

technical field [0001] The invention relates to a method for measuring the viscosity of metal semi-solid slurry with a high solid phase ratio, belonging to the field of viscosity measurement of metal melts. Background technique [0002] In the early 1970s, researchers such as D.B.Spencer of the Massachusetts Institute of Technology discovered that during the solidification process of metals, strong stirring was carried out. Even at a high solid volume fraction, the semi-solid metal still had a relatively low shear stress. This special property is due to the uniform suspension of a certain proportion of spherical solid phase structure in the liquid metal mother liquor. Researchers at the Massachusetts Institute of Technology quickly realized that the feature of metal solidification would have many potential values, and then conducted extensive and in-depth research on it, and developed it into a metal semi-solid forming technology. Metal semi-solid forming technology combine...

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Problems solved by technology

However, when the solid phase fraction of the metal semi-solid slurry is large, its viscosity increases exponentially, and the state is more similar to a solid state. Since the gap between the inner and outer cylinders is generally small, the semi-solid slurry cannot evenly fill the gap between the inner and outer cylinders. Fluctuations, even agglomeration of semi-solid slurry, the viscosity result cannot be measured, especially the viscosity of semi-solid blanks for thixoforming

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