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Crystallography and Thermodynamics of SME-Martensites

  • L. Delaey
  • H. Warlimont

Abstract

SME-martensites are characterized by stress-induced macroscopic shape changes and reversal of these shape changes by simple heating. The shape changes result from stress-induced martensite formation or reorientation. The essential parameters in which the martensitic phase transition will be described are structural, crystallographic and thermodynamic. Three conditions are essential for the occurrence of the shape memory effect: 1. a low energy of nucleation (if the SME is associated with transformation) such that the martensite plates form at moderate rates of growth and, thus, with a high degree of structural perfection and reversibility; 2. a medium degree of frictional stress during growth or reorientation, respectively, such that structural reversibility is maintained while the impediment of interface motion is sufficient to prevent isothermal reversion; 3. a high capacity for elastic energy storage permitting large shape changes to be realized without the production of irreversible defects. The purpose of the present contribution is to show the close interrelationship, which exists for the SME martensites between these three parameters.

Keywords

Habit Plane Shape Memory Effect Martensite Plate Positive Temperature Coefficient Close Packed Plane 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York  1975

Authors and Affiliations

  • L. Delaey
    • 1
  • H. Warlimont
    • 2
  1. 1.Dept. MetaalkundeK.U.LLeuvenBelgium
  2. 2.AlusuisseForschung und EntwicklungNeuhausenSwitzerland

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