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Abstract: Control of
the grain size is integral to reducing the cobalt fraction of iron-cobalt alloys. Using
high-speed imagery and non-contact temperature sensing, it is possible to determine
solidification growth velocities as a function of undercooling and phase. LKT theory can
be used to model this relationship to determine an effective heat capacity of stable
phase growth into pre-existing ... read moremetastable solid. Growth of the stable phase into
pre-existing solid occurs rapidly before slowly reaching equilibrium. The volume of
rapid solidification requires remelting the pre-existing solid. The thickness of this
region can be calculated using the Adiabatic Remelt (AR) Model or Microstructural Limit
(ML) Theory. Both methods require the effective heat capacity calculated by LKT theory.
Use of ML Theory generates an upper limit to the rapid solidification region thickness.
As the predicted thickness using the AR Model is less than this limit, it is physically
validated.
Thesis (M.S.)--Tufts University,
2012.
Submitted to the Dept. of Mechanical
Engineering.
Advisor: Douglas
Matson.
Committee: Anil Saigal, and Robert
Hyers.
Keyword: Materials
Science.read less
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