The single phase, three phase reaction and intermetallic compound in a binary phase diagram for a system.

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Chapter 4, Problem 1P

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The single phase, three phase reaction and intermetallic compound in a binary phase diagram for a system.

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5. (a) Construct the phase diagram for zinc and magnesium system using the following data: Melting point of Mg is 665°C Melting point of Zn is 500 °C One eutectic point at 350 °C with 20% of Zn (i) (ii) (iii) (b) Describe what happens when the mixture of 40% mole of Zn is cooled to from 650 °C to 200 °C?

(a) On the phase diagram below indicate solution treatement temperature (T0), aging temperature (T1), and room temperature (T2) for the alloy of composition C0.

Referring to Figure 1, please answer the following [NOTE: SHOW YOUR WORK on Figure 1]:a. provide the specific name for the phase boundary lines denoted by A and B. b. identify the phases present at equilibrium in the phase fields denoted by C, D, and E. c. identify the specific name for the point denoted by F. d. What is the maximum solid solubility of Mg in Al? At what temperature does it occur? e. An Al-Mg alloy (10 wt% Mg, 90 wt% Al) is heated slowly (to insure equilibrium) from a temperature of 200 C: i. At what temperature does the first liquid phase form? ii. What is the composition of the liquid phase at the temperature in part i.? iii. At what temperature does complete melting (no solid phase remaining) occur? iv. What is the composition of the last solid remaining prior to complete melting? f. Using the equilibrium phase diagram of Figure 1, identify the phases present, their compositions, and their relative mass fractions at equilibrium for a 70 wt% Mg – 30 wt% Al…