What is effect of temperature on hardness of alloys?

Q.  At room temperature, hardness of precipitation hardening alloys ______
- Published on 11 Sep 15

a. increases with time
b. decreases with time
c. remains constant
d. none of the above

ANSWER: increases with time

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    Discussion

  • Sravanthi   -Posted on 21 Nov 15
    - Hardness in precipitation hardening alloys increases with time at room temperature.

    - 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.

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