Answer the following questions by referring to the Cu-Al phase diagram shown below.

Question

(a) What is the lowest temperature at which a liquid can be found in a system of any composition of Cu-Al?

correct

(b) A common alloy composition used in airplanes is 4 at. % Cu - 96 at. % Al. For this overall system composition, identify what phases are present at 500 degrees C. Select all phases present:

Liquid

Vapor

Al

Cu

CuAl2

CuAl

Cu1.5Al

Cu9Al4

Cu4Al

Cu0.75Al0.25
(c) What phases are present at a 50/50 mixture of Al/Cu at 660 degrees C? Select all phases present:

Liquid

Vapor

Al

Cu

CuAl2

CuAl

Cu1.5Al

Cu9Al4

Cu4Al

Cu0.75Al0.25
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(d) In the previous question, you should have identified two phases. What is the phase fraction of the first phase you identified?