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Abstract <p>A die casting technique based on controlled diffusion solidification (CDS) with simultaneous mixing was proposed. In this case, the shot chamber is regarded as the mixing crucible, i.e., the mixing crucible is a horizontal cylindrical vessel, differing from the commonly-used vertical one. Taking pure Al and Al–12Si alloy as precursor alloys 1 and 2 respectively to prepare Al–8Si target alloy, the results showed that using the horizontal mixing crucible, a better mixing effect, i.e., a mixed melt with more uniform temperature and solute fields, and thus, a higher nucleation rate and a resultant microstructure with finer and more spheroidal primary grains, could be obtained, compared with the vertical counterpart. Rising the crucible temperature within a range from 573 to 873 K was beneficial for improving the mixing effect due to the decreased rate of viscosity increase caused by the decreased chilling effect of the crucible wall on the melt. In addition, a pouring position close to the left end of the crucible and a pouring angle approaching 90° with the crucible axis were helpful for achieving a good mixing because of the intensified vortex. At the optimized parameters, a casting with primary grain size of 43.8 μm and shape factor of 1.42 was obtained. These findings confirmed the feasibility of the proposed die casting technique and supplied some basic data for this technique.</p>

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The Microstructure of an Al–Si Alloy Prepared by Controlled Diffusion Solidification with Horizontal Mixing Crucible

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • Shaosi Li,
  • Qinsong Hou,
  • Tijun Chen,
  • Chi Cao

摘要

Abstract

A die casting technique based on controlled diffusion solidification (CDS) with simultaneous mixing was proposed. In this case, the shot chamber is regarded as the mixing crucible, i.e., the mixing crucible is a horizontal cylindrical vessel, differing from the commonly-used vertical one. Taking pure Al and Al–12Si alloy as precursor alloys 1 and 2 respectively to prepare Al–8Si target alloy, the results showed that using the horizontal mixing crucible, a better mixing effect, i.e., a mixed melt with more uniform temperature and solute fields, and thus, a higher nucleation rate and a resultant microstructure with finer and more spheroidal primary grains, could be obtained, compared with the vertical counterpart. Rising the crucible temperature within a range from 573 to 873 K was beneficial for improving the mixing effect due to the decreased rate of viscosity increase caused by the decreased chilling effect of the crucible wall on the melt. In addition, a pouring position close to the left end of the crucible and a pouring angle approaching 90° with the crucible axis were helpful for achieving a good mixing because of the intensified vortex. At the optimized parameters, a casting with primary grain size of 43.8 μm and shape factor of 1.42 was obtained. These findings confirmed the feasibility of the proposed die casting technique and supplied some basic data for this technique.