Preparation of Semi-Solid 357.0 Slurries with Different α-Al Phase Features by Solidification from Full Liquid State and Remelting

Chen，Juan; Hu，Xiaogang; Qu，Wenying; Luo，Min; Li，Zhong; Dong，Enjie; Zhu，Qiang

10.4028/www.scientific.net/SSP.327.223

2022

1012-0394

1662-9779

SOLID STATE PHENOM

327 SSP

223-230

The characteristics of the solid phase, namely the volume fraction, particle size, and morphology, are dominant variables that can determine the viscosity of the semi-solid slurry. However, particle size and morphology were always being ignored and the solid fraction was simply determined using the temperature in the conventional power-law viscosity, resulting in a disagreement in the viscosity values in different researches. To make the power-law viscosity model more accurate for predicting the filling process of semi-solid die casting, it is essential to modify this viscosity model based on particle characteristics. Therefore, there is a fundamental demand to prepare semi-solid slurries with different α-Al phase features at first. This is achieved in this study by two kinds of heat history controlling methods: remelting and solidification, which can get slurries with spherical structure and dendric structure, respectively. The semi-solid 357.0 slurries with 0.11-0.43 solid fraction, 137-182 μm particle size, and 0.81-0.90 shape factor were prepared in the remelting process, while dendritic structures (shape factor < 0.5) with 0.1 and 0.3 solid fractions were obtained by solidification controlling from the full liquid state. Besides, the effect of parameters on the evolution of the α-Al phase has been discussed. These slurries with different solid features will be further used to quantify the influence of primary phase characteristics on rheological behavior and make the power-law viscosity model more accurate for simulation.

Morphology Semi-solid aluminum slurry Size Solid fraction α-Al phase

第一 ; 通讯

英语

2-s2.0-85127189444

Scopus

Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Chen，Juan,Hu，Xiaogang,Qu，Wenying,et al. Preparation of Semi-Solid 357.0 Slurries with Different α-Al Phase Features by Solidification from Full Liquid State and Remelting[C],2022:223-230.