-合金相图题目.doc

9.32 For a copper-silver alloy of composition 30 wt% Ag-70 wt% Cu and at 775℃(1048K), do the following:
(a) Determine the mass fractions of and phases.
(b) Determine the mass fractions of primary and eutectic microconstituents.
(c) Determine the mass fraction of eutectic .

Solution
(a) From the Cu-Ag phase diagram

(b) From the Cu-Ag phase diagram，the mass fractions of primary is

From the Cu-Ag phase diagram，the mass fractions of eutectic microconstituent is

(c) From the Cu-Ag phase diagram，the mass fraction of eutectic is