tion of the nickel supe-aiiuy. 11. What is the purpose of stable precipitates su

Question

tion of the nickel supe-aiiuy. 11. What is the purpose of stable precipitates such as NigAl, NigTi, MoC and TaC in a nickel-based super-alloy intended for high-temperature use? A. To increase the elastic modulus B. To hinder dislocation glide C. To increase the density D. To blunt crack tips E. To increase density 12. What is the purpose of substitutional solutes in a nickel-based super-alloy intended for high- temperature use? A. To increase the elastic modulus B. To hinder dislocation glide C. To increase the density D. To blunt crack tips E. To increase density

Explanation / Answer

Ans of 11

Correct option is B that is to hinder the dislocation glide

strength of the super alloyes must be high in oder to prevent the oxidation and creep resistance but the strength is decreased with increase in temprature so resistance interfere the dislocation motion.

Ans of 12

ans is C or E because both option is same that is increase the density

because the strength of the solution must be high and strengthening mechanism in which element (solute) is dissloved in the lattice of host metal (solvent) and increase the strength of the solution .now increasing the density of subsitutional solute strength of the solution also increase. that is the reason of using subsitutional solute in nickel based super alloyes used for high temprature.

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