Microstructural characterization of NiTi shape memory alloy produced by rotary hot forging

P. Rodrigues, F. M. Braz Fernandes, A. S. Paula, J. P. Oliveira, S. B. Ribeiro, E. N. Texeira, N. Schell

Research output: Contribution to journalArticle

Abstract

The thermomechanical processing of NiTi shape memory alloys usually involves several steps of hot and/or cold deformation. The present work presents the structural characterization of a Ni-rich NiTi alloy bar, produced by vacuum-induced melting and thermomechanical processing in laboratory scale, aiming at massive production in the future. This study focused on the first step of hot working at 800 °C during rotary forging. Microstructural characterization was performed using differential scanning calorimetry, high- and low-temperature X-ray diffraction (XRD) using a laboratory source and synchrotron XRD. Thus, it was possible to obtain the phase transformation characteristics of the material: the transformation temperatures and the transformation sequence. Proposed thermomechanical processing is intended for production of bars and wires that will be subsequently drawn to get thin wires, for different applications, including orthodontic arch wires.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalPowder Diffraction
Volume32
Issue numberS1
DOIs
Publication statusAccepted/In press - 1 Sep 2017

Keywords

  • microstructural characterization
  • NiTi alloy
  • phase transformation
  • rotary hot forging
  • X-ray diffraction

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