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

DoITPoMS Teaching & Learning Packages Toughening Questions
Toughening AimsBefore you startIntroductionDuctile failureTransformation tougheningEffect of constraintsMaking tough zirconiaTRIP and TWIP steelsCrack deflectionFibre pull out How do fibres affect the Weibull modulus?Toughness in compressionSummaryQuestionsGoing further
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Questions

Quick questions

You should be able to answer these questions without too much difficulty after studying this TLP. If not, then you should go through it again!

  1. Which is not a requirement when choosing the matrix of a zirconia toughened ceramic?

    a High solubility for zirconia
    b Cheaper than zirconia
    c Stiffer than zirconia
    d Has very little to no reaction with zirconia

  2. What is a condition for the tetragonal to monoclinic phase transformation if it is used to toughen a material?

    a The operating temperature must be above the transformation temperature
    b There must be a large barrier to transformation
    c There must be a reasonable strain associated with the transition
    d The tetragonal phase must be stable at the operating temperature

  3. Toughening is limited by the strength of the fibres in a short fibre composite.

    a True
    b False

Deeper questions

The following questions require some thought and reaching the answer may require you to think beyond the contents of this TLP.

  1. When making extended grains in ceramics such as Si3N4, why is it important to cool the ceramic reasonably quickly after consolidation at high temperature?

  2. Why do we toughen materials?

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