2. Use the Cu-Zn binary phase diagram to answer the following questions a) What

Question

2. Use the Cu-Zn binary phase diagram to answer the following questions a) What is the maximum solubility of Cu in Zn and at what temperature does this occur? b) What crystal structure would this solid solution have (see part a)? c) Identify a peritectic reaction (write the reaction and give the temperature). d) Identify a eutectoid reaction (write the reaction and give the temperature). e) Cartridges for ammunition are made of brass containing 30 wt. % Zn. The strength of cartridge brass exceeds that of pure copper, especially after cold working. What is the reason the strength increases for cartridge brass as compared to pure copper? f) Muntz metal (40 wt. % Zn) is used in fresh water condenser systems due to its corrosion resistance. What phases are present i g) How much of the Muntz metal, by volume, consists of a copper solid solution at 500 °C, if the Cu solid solution has a density of 8.53 g/cc and the other phase has a density n Muntz metal at 500°C? h) What is the atomic formula of the delta (8) phase?

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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