Al-Ag-Ge合金熔凝过程中液相流动机制与旋涡组织形成的相关规律研究

Hao Ran Li, Ying Ruan, Bing Bo Wei

科研成果: 期刊稿件文章同行评审

摘要

Fluid flow and solidification mechanisms of Al70Ag20Ge10 alloy were systematically investigated using electromagnetic levitation, induction, arc, and resistance melting techniques coupled with finite element simulation method. A unique type of vortex-shaped microstructure was formed in these four experiments. This was different from the result under slow solidification conditions. The formation of the vortex-shaped structure was affected by fluid flow and cooling rate of alloy melt. The Lorentz force caused turbulent flow in alloy melt, while the turbulent flow during arc melting was driven by arc force under electromagnetic levitation or induction melting conditions. The surface tension and buoyancy force caused laminar flow in alloy melt during the resistance melting process. Due to rapid flow, the Ag2Al phase nucleated ahead of the Al phase, primarily under near-equilibrium conditions. The metastable Ag2Al dendrites grew as vortex-shaped morphology and preserved the melt flow pattern during solidification. The increased cooling rate caused a rapid growth of metastable Ag2Al dendrites with increased vortex density. The curvature radius of metastable Ag2Al dendrites decreased with enhanced melt flow; meanwhile, the more drastic nucleation and growing competition among phases occurred. Finally, irregular Al, Ag2Al, and Ge ternary eutectics fully formed inside the vortex-shaped structure.

投稿的翻译标题Fluid flow and vortex-shaped structure formation mechanisms of Al-Ag-Ge alloy
源语言繁体中文
页(从-至)941-956
页数16
期刊Zhongguo Kexue Jishu Kexue/Scientia Sinica Technologica
52
6
DOI
出版状态已出版 - 2022

关键词

  • cooling rate
  • eutectic
  • fluid flow
  • rapid solidification
  • solidification microstructure

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