Question

Answer the following questions with regard to an alloy of copper with 64 percent of lead that is slowly cooled in a crucible without being stirred from 1100C to room temperature (a) What is the nature of the alloy at 1100 C? (b) Now consider the alloy at a temperature just above the monotectic temperature at 955C, where it is composed of the two liquids of different compositions. Do the liquids have the same density? If not, what would you expect to happen? (c) One of the liquids has the composition of monotectic point. What should happen to this liquid as it passes though the monotectic temperature of 955C? Describe the physical nature of the contents of the crucible after the alloy is cooled below 955C, and until it reaches the eutectic temperature at 326C. Monotectic Systems Atomic percent lead 10 30 0 50 60 70 80 100 1200 1084.87 64 1%,995t5'C 1000955C 374 800 Liquid 600 400 (Cu) Pb) 200 0 10 20 3040 50 60 708090 100 Weight percent lead Cu Pb FIG. 11.19 Copper-lead phase diagram. From Bary Alley Pase Diagrams Massalski, T.B. Editor-in-Chicl, ASM International, 1986, p. 946. Reprinted with permission of ASM International(K). All rights reserved. www.asiminternational.org)

Answer 1

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