(b) Figure 1 shows the phase diagram of binary alloy Cu-Ni. 20 40 60 80 100 1600 2800 15001 Liquid 2600 1400 2400 Temperature C 1300 Temperature 1 1200 2200 B 1100 2000 1000 0 20 40 60 80 100 Cu Composition will NO IND Figure 1: Phase diagram of binary alloy Cu-Ni Microstructure of the alloy at Point B and D depends on the cooling rate involved during the solidification of the alloy. Sketch and label the microstructure of the alloy at: (1) Point A (ii) Point B (if it experienced equilibrium solidification) (ii) Point B (if it experienced non-equilibrium solidification) (iv) Point D (if it experienced equilibrium solidification) [NOTE: Quantitative measurement/calculation is not needed] [8 marks)