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·
A
two step computation gives the distribution of the a-phase
between the primary material and that produced at the eutectic temperature.
· The
primary a-phase
is formed above 183 C, and application of the lever
rule just above the eutectic
temperature shows it is 51% of the total mass.
· Once
the eutectic temperature is reached, the 49% of eutectic liquid decomposes
into 45% a- and
55% b-phase
to give an additional contribution of 22% a-
and 27% b-
phase.
· The
total a-phase
is 73% and the total b-phase
is 27% as indicated by the single step calculation, but now the distribution
between primary and eutectic a-phase
is known. |
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