DoITPoMS

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Questions

  1. Which of the regions of this Fe-C phase diagram are solid solutions?

    Phase diagram

    a 1, 2, 6, 9
    b 2, 6, 7, 8, 9, 10
    c 2, 6, 9
    d 2, 4, 6, 8, 9
    e 4, 7, 8, 10
    f 7, 10
    g 1, 2, 6, 7, 9, 10

  2. Will the following factors affect the extent of solid solubility?

    Yes No a Composition
    Yes No b Temperature
    Yes No c Atomic radii
    Yes No d Crystallographic structure
    Yes No e Electronegativity
    Yes No f Valency
    Yes No g Interaction parameter

  3. How might a supersaturated solid solution be formed, using the following phase diagram? α and β are solid solutions.

    Phase diagram

    a Quench from T1 to T2 with composition x
    b Cool slowly from T1 to T2 with composition x
    c Quench from T1 to T2 with composition y
    d Cool slowly from T1 to T2 with composition y

  4. Which of these will not explain the strengthening of a solid solution?

    a Lattice distortion
    b Order hardening
    c Stress fields
    d Interaction with dislocations

  5. Which of these is not a feature of exsolution in a solid solution?

    a Negative interaction parameter
    b Positive enthalpy of mixing
    c Formation of A rich and B rich regions
    d Increase in short range order


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