You DO NOT need to do Knowns/Unknowns/Assumptions. You may want to electronicall

ID: 2994898 • Letter: Y

Question

You DO NOT need to do Knowns/Unknowns/Assumptions.

You may want to electronically or photographically blow up portions of the diagram to be able to

be more precise in your measurements.

1) Using the phase diagram provided identify the type of phase transformations at:

(a) 8.3 w/o and 1036 ?C

(b) Approximately 23.5 w/o and 560?C

2) Determine the phases present, the composition of phase(s) and percent phase(s) present for the

following conditions in the Al-Cu system:

A) 16 w/o Al, 800 ?C

B) 19 w/o Al, 950 ?C

C) 35 atomic percent Al at 1000?C

part 1.

a . liquid -----> solid 1 + solid 2 it ie eutectic reaction

L ------> cu + beta

b. solid --------> solid 1 + solid 2 it is eutectoid reaction.

E ---------> delta + ti

c. there is no phase transition

only liquid L is present.

part 2.

a. phase present is gamma 1 + gamma 2 ------> gamma 2 composition is 16% of Al.

r1+r2---------> r2

b. gamma 1 changing to gamma 1 + epsla 1 compostion 19% Al

r1---------> r1 + E1

c. only Liquid phase is present. 100% L (35% of al)

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