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J.-H.
Shih, J.-Y. Wu, E. J. Lavernia, 1993, “The Coarsening
Behavior of Primary Si in Melt-Spun Al-22wt% Si Alloy,”
Scripta Metallurgia et Materialia, 29,
31-36
The
Coarsening Behavior of Primary Si in Melt-Spun Al-22wt%
Si Alloy
ABSTRACT
Al-Si
alloys are attractive materials due to their low thermal
expansion coefficient and improved wear resistance.
The improved properties are attributed to the high
volume faction of the primary Si phase particulates.
Under conventional solidification conditions, however,
high Si addition usually lead to the formation of
coarse brittle phase which adversely affects the mechanical
property. Rapid solidification processes, such as
melt spinning, substantially modify the morphology
of the Si phase which lead to improved mechanical
properties. However, the coarsening during subsequent
thermal mechanical treatment remain of interest. In
this paper, the coarsening behavior of Si in a hypereutectic
Al-Si alloy produced by melt spinning is studied to
determine the temperature and time dependency of the
size and distribution of the primary Si phase. The
cooling rate during rapid solidification, on the order
of 105 K/s, was also evaluated using 1-D
transient heat transfer analysis.
(Article
in PDF, ScienceDirect - Elsevier Science)
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