Impact of Brownian motion on the particle settling in molten metals

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• 作者：J. B. Ferguson (1)
  Benjamin F. Schultz (1)
  Pradeep K. Rohatgi (1)
  Chang-Soo Kim (1)
  
• 关键词：solidification ; nanostructured materials ; homogenization/solutionization ; melting ; composites
• 刊名：Metals and Materials International
• 出版年：2014
• 出版时间：July 2014
• 年：2014
• 卷：20
• 期：4
• 页码：747-755
• 全文大小：494 KB
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• 作者单位：J. B. Ferguson (1)
  Benjamin F. Schultz (1)
  Pradeep K. Rohatgi (1)
  Chang-Soo Kim (1)
  
  1. Department of Materials Science and Engineering, University of Wisconsin-Milwaukee, Milwaukee, WI, 53211, USA
  
• ISSN：2005-4149

文摘

Understanding the settling behavior of nanoparticles in molten metals/alloys is important as it will aid in achieving uniform dispersions of reinforcement particles in metal matrix nanocomposites. Uniform dispersions are necessary to activate the Orowan strengthening mechanism, which can increase yield strength without significant diminishment of ductility. In this work, an analytical model of particle size effects on settling is described that takes into account both deterministic Stokes-law and stochastic Brownian motion. The model shows a clear transitional behavior where settling velocity follows Stokes-law for large particles and then drops to zero for small particles implying that Brownian motion predominates. It indicated that, in the Brownian motion regime, where the discrete nature of the liquid must be considered, the random motion imparted by unbalanced collisions can overwhelm the motions normally imposed by forces such as gravity, viscous drag, and thermal/concentration gradients.