On the Stressing of Annealed NITINOL: The Electrical Resistance and Calorimetric Effects

Abstract

The effects of stress on the electrical resistance and scanning calorimetry curves of NITINOL during its phase transformation are substantial. The generation of a peak occurs in the resistance curve, and an additional peak is generated in the calorimetry curve for the transformation during cooling, as compared to annealed metal. Explanation of the relation between stress and the formation of these peaks is presented for both cooling and heating cycles. Straining the wire in the martensitic versus the austenitic condition also can result in differences in the subsequent phase transformation. These differences can be exploited for one-time higher temperature applications of this shape memory alloy.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1987
Accession Number
ADA184465

Entities

People

  • David M. Goldstein

Organizations

  • Naval Ordnance Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Cooled
  • Alloys
  • Chemical Compounds
  • Chemistry
  • Electrical Resistance
  • Energy
  • Engineering
  • Heat Energy
  • Latent Heat
  • Materials
  • Materials Engineering
  • Materials Science
  • Military Research
  • Phase Transformations
  • Residual Stress
  • Shape Memory Alloys
  • Temperature Gradients

Readers

  • Materials Science and Engineering.
  • Mechanical Engineering/Mechanics of Materials.
  • Metallurgy