Problem 2 4. Consider the Cu-Zn phase diagram and answer the following questions

Question

Problem 2 4. Consider the Cu-Zn phase diagram and answer the following questions: (a) What are the solid solubility limits of Zn in Cu and Cu in Zn at 200°C? (b) Write the eutectic reaction, indicating the eutectic temperature and the phase compositions. (c) Draw the free energy - composition curves for the phases participating in the eutectic reaction (d) For the Cu-40Zn alloy at 200°C, what are the phase fractions and compositions? Zn (% K.6.) 0 10 20 30 40 50 60 70 80 90 100 1200 1100 1083°C Yypó 1000 900 800 700 600 500 400 300 200 100 902° 834 31.0% 700° 598° 4680 38,3% 558 419° 454 i424° 0 10 20 30 40 50 60 70 80 90 100

Explanation / Answer

1) Maximum Solubility of Cu-Zn (48 %)

2) Copper Structure : FCC

3)Peritectics at:(1) XZn = 37%, T = 900 C; (2) XZn = 60%, T = 825 C; (3) XZn = 73%,

T = 700 C; (4) XZn = 79%, T = 600C; (5) XZn = 99%, T = 420C.

4) Eutectoids at: Eutectoid at: XZn = 73%, T = 555 C

5) Cartidge brass has a nominal composition of 70% copper and 30% zinc.

6) Muntz metal is a form of alpha-beta brass with about 60% copper, 40% zinc and a trace of iron.

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