Dissemination of IT for the Promotion of Materials Science (DoITPoMS)

DoITPoMS Teaching & Learning Packages Solid Solutions Questions
Solid Solutions AimsBefore you startIntroductionSolid solutionsOlivineThermodynamics of solid solutionsFree energyExsolution in phase diagramsDemonstration of phase separationPrecipitates from solid solutionMonte Carlo simulationWeb version of Monte Carlo simulationSummaryQuestionsGoing further
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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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