A) What is the maximum amount of aluminum that can be incorporated in a Ni-Al al
ID: 880293 • Letter: A
Question
A) What is the maximum amount of aluminum that can be incorporated in a Ni-Al alloy and still carry out a classical precipitation strengthening heat treatment? (2 points)
B) If we select an alloy of 0.20 fraction aluminum, balance nickel, what temperature would you use for a solid solution heat treatment? (3 points)
C) If we were to do precipitation strengthening at 600oC on this alloy and then cool rapidly to room temperature, how much ? and ?’ would be present, and what would the composition of each of these phases be at equilibrium? (10 points)
1800 1600 Liquid 1400 1200 1000- AINi (Ni) D 800 600- (AI) 400 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 d Al Ni x(Ni)Explanation / Answer
For the above given example,
A) the maximum amount of aluminum that can be incorporated in a Ni-Al alloy and still carry out a classical precipitation strengthening heat treatment is 0.5
B) If we select an alloy of 0.20 fraction aluminum, balance nickel in the sample would be = 0.8.
The temperature would be 1000 oC we would use for a solid solution heat treatment
C) If we were to do precipitation strengthening at 600oC on this alloy and then cool rapidly to room temperature, the amount of and ’ present in the sampl would be 0.37 and 0.63.
The composition of each of these phases be at equilibrium would be 0.5 and 0.5