Question

4. Based on the given Cu-Zn phase diagram in figure 1, identify all the microstructural changes in terms of phases changes) for Cu-30 wt.% Zn and Cu-40 wt.% Zn alloy when they are slowly cooled down to room temperature from their melting temperatures. What are the approximate temperatures where phase changes occur during solidification of the alloys? Composition at% Zn) 60 80 1200 100 12200 2000 Liquid 1000 7 1800 BOL 1600 800 1400 1 (9.) orada 1 Emperature (F) 8. 1200 600 V: 1000 800 400 2 4600 200 60 2.400 100 (Zn) Cu) Composition (wt% Zn) Figure 1: Cu-Zn Phase Diagram (Ref: Mat. Sc. and Eng., W.D. Callister)

Answer 1

o For Cu-301. Zn The solidification sequence followed: cool cool at L a L 970 9 30 start at The solidi fication will 970 & complete solidification will be cet a 30c For Cu- 40% Zn The solidification sequence followed: a tß cool e Bth Contop cool sooc 460 at B 896c start at The solidification will 900C & complete solidification will be cet esgóc Though, by further cooling the solid Phase will change up to 460°C

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