Homework 6 - MSE 230 HW6(due 02/25 02/26 Spring 2010 1...

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MSE 230 HW6 (due 02/25, 02/26) Spring 2010 1. Refer to the Cu-Zn phase diagram, Fig. 9.19. Sketch or trace and label the relevant portion of the phase diagram to show the basis for your answers to the following questions: (a) At 400°C, what is the solubility of Zn in Cu? If slightly more Zn is added, name the new phase that forms and give its composition. (b) At 400°C, what is the solubility of Cu in Zn? If slightly more Cu is added, name the new phase that forms and give its composition. (c) When heating cartridge brass (Cu-30 wt.% Zn), at what temperature does melting begin? At what temperature does it become completely molten? What is the “freezing range” of this alloy? 2. Refer to the Cu-Ag phase diagram, Fig. 9.7. For an alloy composition of 50 wt.% Ag: (a) Determine the (1) phases, (2) phase compositions (wt.% Ag), and (3) phase proportions (wt. fraction of phases) at equilibrium at each of the following temperatures: 1000°C, 800°C, and 600°C. (b) Determine, as in part (a), the phases, phase compositions, and phase proportions present at equilibrium just above
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