Solid-liquid Mixed Rheological Casting Of Al-Zn Alloy

In this paper, based on the traditional mechanical mixing process, a new technology for preparation o f semi-solid slurry solid-liquid mixed rheological casting technology optimization, in the study o f the solid liquid mixed rheological casting process o f melting characteristics o f prefabricated Al-Zn alloy, and alloy composition, grain refiner on microstructure o f the solid-liquid mixed casting o f rheological effect the mixing rheological casting grain refinement mechanism in the process o f solid and liquid, and solid-liquid mixed rheological casting analysis o f melting and solidification process numerical simulation method, the results o f the study show that:When the quality o f melt and preform ratio was 7:1, the initial melt temperature is the main factor affecting the semi-solid microstructure, higher than the liquidus temperature o f 40 °C for the best experimental. The quality o f melt and the preform is melt temperature curve o f 7:1 to below the liquidus temperature after steady, and the quality o f melt and the preform is melt temperature curve fluctuations 3:1 greatly. With the i. With the increase in the proportion o f the curve at the liquidus temperature, the fluctuation is smaller, the ratio can be obtained when the temperature curve o f stable 7:1. The semi-solid sluny o f Al-5%Zn, the optimal scheme was melt for Al-3%Zn preform was A M 5% Zn, the mass ratio o f 5:1, then can obtain the fine grain size, round organization boundary.Adding grain refiner, the grain size is significantly reduced, the grain is spherical or rosette, microstructure o f semi solid slurry o f roundness, the excellent quality; on the other hand, in the preform stirring, Zn content is within the range o f 3% to 20%, when the Zn content o f 10%, the most fine grain.This paper establishes a LB model, this model has the flow field and temperature field o f the interval, Al-15%Zn alloy during melting process simulation o f mixing the preform and the melt flow field and temperature field, and the simulation results were compared with the experimental results, the results show that the temperature field and the experiment results o f the model simulation is consistent with that o f speed field experiment was not due to confirm.