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

DoITPoMS Teaching & Learning Packages Superelasticity and Shape Memory Alloys Aims
Superelasticity and Shape Memory Alloys AimsBefore you startIntroductionMartensitic Phase Transformations - A Simple ExampleMartensitic Phase Transformations - Basic ThermodynamicsMartensitic Phase Transformations - Hysteresis CharacteristicsSuperelasticity - Strain Accommodation by Martensite FormationSuperelasticity - Hysteresis in the Stress-Strain BehaviourShape Memory Effect - "Training" of the TransformationShape Memory Effect - The "Ferris Wheel" ExperimentMicrostructural Changes during Thermo-Mechanical TreatmentLimits of SuperelasticityApplicationsSummaryQuestionsGoing further
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Aims

On completion of this TLP you should understand:

  • how Deformation Twinning and Martensitic Transformations can generate a shape change
  • the phenomenon of Superelastic Deformation, which is a reversible Shape Change effected by Martensitic Transformations
  • the role of temperature, which affects the driving force for a Martensitic Transformation, and can also influence the ease of slip (dislocation motion)
  • the Shape Memory Effect, in which temperature changes are used (in alloys with certain characteristics) to promote reversible Martensitic Transformations and hence to control component shape

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