What is homogeneous solid solution?

Q.  In precipitation hardening, at 540o C when θ phase (CuAl2) completely dissolves at grain boundaries the single phase α is obtained known as ____   
- Published on 11 Sep 15

a. saturated solid solution
b. homogeneous solid solution
c. heterogeneous solid solution
d. supersaturated solid solution

ANSWER: homogeneous solid solution

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    Discussion

  • Sravanthi   -Posted on 21 Nov 15
    - Strength and hardness of such alloys is enhanced by forming small dispersed particles of second phase in original phase matrix. Appropriate heat treatment is used to accomplish this.

    - As these small particles are known as precipitates, this process is called as precipitation hardening.

    - The solubility of solute in solvent should decrease when temperature decreases. The different steps followed in precipitation hardening are: solutionizing, quenching and aging.

    - Homogeneous solid solution is also called as supersaturated solid solution. The α phase is obtained when θ phase (CuAl2) is completely dissolved at grain boundaries at 540° C.

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