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Negative thermal expansion arrest point memory effect in TiNi shape memory alloy and NbTi/TiNi composite

Authors
Journal
Materials Science and Engineering A
0921-5093
Publisher
Elsevier
Publication Date
Volume
549
Identifiers
DOI: 10.1016/j.msea.2012.04.013
Keywords
  • Martensitic Transformation
  • Shape Memory Alloy (Sma)
  • Scanning Transmission Electron Microscopy (Stem)
  • Negative Thermal Expansion Arrest Point Memory Effect

Abstract

Abstract A pre-strained TiNi wire shows an unusual turning point on its strain–temperature trajectory in the thermal cycle subsequent to one incomplete reverse transformation. This turning point has a close relation with the previous arrest temperature and the corresponding arrest strain, which can be regarded as a memory of the arrest strain–temperature point. We name it as negative thermal expansion arrest point memory effect. Furthermore, to acquire larger operational temperature range of this effect, a novel NbTi/TiNi composite is introduced.

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