3. Nickel-based superalloys are precipitation-strengthened by first forming a so

Question

3. Nickel-based superalloys are precipitation-strengthened by first forming a solid solution and then lowering the temperature into a two-phase region to form a precipitate, which is an intermetallic compound. a) What is the maximum Al solubility in Ni and at what temperature does it occur? b) Estimate the solubility limit of Al in Ni at 500°C in weight percent. c) Calculate the wt % Ni Al formed at 500°C when a Ni-7 wt. % Al composition is cooled from 1300°C, assuming thermodynamic equilibrium occurs at both temperatures? d) Write the peritectic reaction that occurs at 1135 C e) Give the chemical formula for What compound would you select for high-temperature use (give both the Greek symbol and the chemical formula)? 700 600 500 400 1300 1200 100 800 700 600 500 300 200 AI 0 20 30 40 0 60 70 80 90 N Weight Percentage Nickel

Explanation / Answer

Graph is not clear

a maximum solubility of Al is around 95% by weight at 640.

b 0%

c I am not able why 7 is written if leaving 7 then AlNi3 wt 100%

d Liquid + solid Al3Ni2 forming b-AlNi.

e Al2Nii

f delta-AlNi

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