Use the Al-Ni phase diagram given below. Consider a homogeneous Al70Ni30 liquid

Question

Use the Al-Ni phase diagram given below. Consider a homogeneous Al70Ni30 liquid (composition = 30 at.% Ni), initially at 1600 degree C and being cooling slowly, describe the cooling process. At what temperature will the first solid phase appear? What is the first solid phase? At what temperature will the second solid phase appear? What is the second solid phase? What happens to the first solid phase after equilibrium has been reached for the second solid phase? At what temperature will the third solid phase appear? What is the third solid phase? What happens to the second solid phase after equilibrium has been reached for the third solid phase? Draw a schematic cooling curve as the homogeneous Al70Ni30 liquid is cooled from 1600 degree C to 400 degree C

Explanation / Answer

1) 1260 : 2)alpha or AlNi : 3) 1133 : 4) beta.Al3Ni3 5) Phase transformation from AlNi to Al3Ni3 6) 854 : 7) gamma ..Al3Ni2 8) again phase transformation from Al3Ni3 to Al3Ni and Al3Ni3

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