Metallurgical and Materials Transactions A

, Volume 42, Issue 6, pp 1667–1674 | Cite as

Kinetic Analyses of the Growth and Dissolution Phenomena of Primary Si and α-Al in Partially Molten Al-Si (-Cu-Mg) Alloy Particles Using In Situ Transmission Electron Microscopy

  • Santhana K. Eswara MoorthyEmail author
  • James M. Howe


The growth and dissolution behavior of primary Si and α-Al in partially molten hypereutectic Al-Si–based alloy particles was investigated using in situ TEM to reveal the dynamic and instantaneous processes occurring during these phenomena. Direct evidence for the preferential growth of Si {113} facets compared with {111} facets resulting in prominent {111} facets bounding the Si crystals was obtained. The nucleation of primary Si was found to occur heterogeneously on the encapsulating alumina shell, whereas the α-Al phase nucleated homogeneously from the liquid Al-Si phase. The morphology of primary Si during growth was found to be highly faceted during growth but smoothly curved during dissolution, revealing fundamental mechanistic differences during these processes. We provide a ledge-based interpretation to explain the difference in growth and dissolution behavior. The α-Al phase displayed smoothly curved growth and dissolution morphologies, which are characteristic of an isotropic interfacial energy and a continuous growth mechanism.


Dissolution Behavior Alloy Particle Oxide Shell Growth Twin Equilibrium Volume Fraction 
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© The Minerals, Metals & Materials Society and ASM International 2010

Authors and Affiliations

  1. 1.Department of Materials Science and EngineeringUniversity of VirginiaCharlottesvilleUSA
  2. 2.Laboratoire de Physique des Solides, Centre National de la Recherche Scientifique (CNRS)Université Paris SudOrsayFrance

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