Phase transformation characteristics and mechanical characterization of nitinol synthesized by laser direct deposition

Pratik R. Halani, Irfan Kaya, Yung C. Shin, Haluk E. Karaca

Research output: Contribution to journalArticlepeer-review

83 Scopus citations

Abstract

Laser direct deposition, an additive manufacturing technique, has been proved to be an effective method to synthesize nitinol from elemental nickel and titanium powders for the fabrication of near-net shaped components. In this study, the experimental procedures and results are presented for understanding the phase transformation characteristics and mechanical behavior of laser synthesized nitinol. Different transformation temperatures were successfully achieved by changing the initial ratio of Ni and Ti powders coupled with post aging heat treatment. The results obtained from the uniaxial compression testing at different temperatures indicate that the samples recovered strain completely by both the shape memory and super-elastic effects. Hence, the capability of laser direct deposition technique to synthesize nitinol with required micro-structure and mechanical properties is demonstrated.

Original languageEnglish
Pages (from-to)836-843
Number of pages8
JournalMaterials Science and Engineering: A
Volume559
DOIs
StatePublished - Jan 1 2013

Keywords

  • Laser direct deposition
  • Nitinol
  • Phase transformation temperature
  • Shape memory effect
  • Super-elasticity

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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