fig 9.3a Problem 9.14 A 40 wt% Ni-60 wt% Cu alloy (Animated Figure 9.32) is slow
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Question
fig 9.3a
Problem 9.14 A 40 wt% Ni-60 wt% Cu alloy (Animated Figure 9.32) is slowly cooled from 1400°C (2550°F) to 1150°C (2100°F). (a) At what temperature does the first solid phase form? oC [The absolute tolerance is +/- 6.] (b) What is the composition of this solid phase? | %wt Ni [The absolute tolerance is +/-2.] (c) At what temperature does the last of the liquid solidify? oC [The absolute tolerance is +/- 6.] (d) What is the composition of this last remaining liquid phase? | %wt Ni [The absolute tolerance is +/-2.]Explanation / Answer
a) 1280 0 C, at this temperature beta phase starts forming. To understand this drop a vertical from 1400 to 1150 degree Celsius for given composition
b) Use tie line rule to find composition. Draw an isotherm at 1280 and see where it crosses the soludua line. So composition is 58wt%Ni-42wt%Cu.
c) 1240 0 C
d) Draw a horizontal line at this temperature. fund where it touches the liquidus line. So compoaition is 75wt%Ni-25wt%Ni
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