Question

10. In the following phase diagram for Zn-Cu Alloy. Label one eutectic, eutectoid and peritectic point and write down the reactions and all other relevant details. Also explain the eutectoid reaction i.e. why does one solid phase convert to two solid phases as the alloy cools down.....(5 points)

Answer 1

Composition (at% Zn) 0 20 40 60 80 1200 100 72200 2000 a+L Liquid 1000 1800 B+L 1600 800 1400 B Temperature (°C) Pentectic Temperature (°F) 8 1200 B 88 600 8+ 7+1000 Eutectic 18 800 E 400 77 8 + 600 1 1 1 200 0 (Cu) 20 40 60 80 400 100 (Zn) Composition (wt% Zn) Pertectic - solid + solid Liquid +Solid Cool Ltr heat cool Eutectic Liqzid Solid + Solid heat At Eutectoid point two liquid lines meet no such In given phase diagram there is point present

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