Japan
Assignment # 5
Q.1a) On the "blank" phase diagram below, label each of the regions with the phase or phases that are in equilibrium there.
b) How many eutectic points are there in the Cu-P phase diagram? ______ How many eutectoid points? ______ How many peritectics? ______ How many peritectoids? ______ How many pure metal phase transitions? ______ How many congruent melting points??______
Q.2 a) A 90 wt% Ag-10 wt% Cu alloy is heated to a temperature within the b + liquid phase region. If the Composition of the liquid phase is 85 wt% Ag, determine: (a) The temperature of the alloy (b) The composition of the b phase
(c) The mass fractions of both phases b) For a copper-silver alloy of composition 25 wt% Ag-75 wt% Cu and at 775°C (1425°F) do the following: (a) Determine the mass fractions of α and β phases. (b) Determine the mass fractions of primary α and eutectic microconstituents. (c) Determine the mass fraction of eutectic α.
Q.3 For some transformation having kinetics that obeys the Avrami equation. the parameter n is known to have a value of 1.7. If, after 100 s, the reaction is 50% complete, how long (total time)
will it take the transformation to go to 99% completion? The kinetics of the austenite-to-pearlite transformation obeys the Avrami relationship. Using the fraction transformed–time data given below, determine the total time required for 95% of the austenite to transform to pearlite:
Q.4 Write down six invariant Binary reactions by showing schematically and with examples
Due date: 22 October, 2012
Q.1a) On the "blank" phase diagram below, label each of the regions with the phase or phases that are in equilibrium there.
b) How many eutectic points are there in the Cu-P phase diagram? ______ How many eutectoid points? ______ How many peritectics? ______ How many peritectoids? ______ How many pure metal phase transitions? ______ How many congruent melting points??______
Q.2 a) A 90 wt% Ag-10 wt% Cu alloy is heated to a temperature within the b + liquid phase region. If the Composition of the liquid phase is 85 wt% Ag, determine: (a) The temperature of the alloy (b) The composition of the b phase
(c) The mass fractions of both phases b) For a copper-silver alloy of composition 25 wt% Ag-75 wt% Cu and at 775°C (1425°F) do the following: (a) Determine the mass fractions of α and β phases. (b) Determine the mass fractions of primary α and eutectic microconstituents. (c) Determine the mass fraction of eutectic α.
Q.3 For some transformation having kinetics that obeys the Avrami equation. the parameter n is known to have a value of 1.7. If, after 100 s, the reaction is 50% complete, how long (total time)
will it take the transformation to go to 99% completion? The kinetics of the austenite-to-pearlite transformation obeys the Avrami relationship. Using the fraction transformed–time data given below, determine the total time required for 95% of the austenite to transform to pearlite:
Q.4 Write down six invariant Binary reactions by showing schematically and with examples
Due date: 22 October, 2012