Question

The Cu-Sn phase diagram has historical significance as this alloy is known as bronze. The ability to make a bronze alloy changed civilization since bronze has a higher yield strength than pure copper. Cu-Sn alloys also have modern applications in electronics as a basis for the replacement of lead based solders. Answer the following questions, relative to this diagram What is the melting point of pure Cu? What is the melting point of pure Sn? What is the solubility of Sn in Cu at 600 °C? A sample that is 82% Cu and 18% Sn is cooled from 1100°C to room temperature. what phases are present at each of the following temperatures: 850°C, 700°C, 550°C, 450°C, 200°C? For an alloy that is 82% Cu at 200 C: what phases are present, what is the composition of each phase and what is the mass fraction of each phase? 1. 2. 3. 4, 5. 1200 1000 Liquid 800 (Cu) e 600 Cu 400 Cu, ,Sn 41 11 CD 200 (Sn) 0 0 10 20 30 40 50 60 70 80 90 100 Mass % Cu

Material Science!!!

Answer 1

poinrg pure Sn u 231.9"c 鼾60pC theftabil lote Phass Pron Tenpetattre 850C 2. 450° C 202° C

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