Effects of aging on the shape memory and superelasticity behavior of ultra-high strength Ni54Ti46 alloys under compression

I. Kaya, H. Tobe, H. E. Karaca, B. Basaran, M. Nagasako, R. Kainuma, Y. Chumlyakov

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13 Citations (Scopus)

Abstract

This study investigates the effects of aging on the shape memory and superelasticity behavior of a Ni-rich Ni54Ti46 (at%) alloy. Differential scanning calorimetry (DSC), X-ray diffraction (XRD), transmission electron microscopy (TEM) and compression test (thermal cycling under stress and superelasticity) were carried out after 3 h agin;g from 450 °C to 600 °C. The alloys show recoverable shape memory effect with transformation strains of about 1% and narrow hysteresis under high stress levels. The work output of 14.1 Jg−1 was observed at an ultra-high stress level of 1500 MPa after 600 °C 3 h aging. 450 °C 3 h aging resulted in a very narrow temperature hysteresis of 8°C under an ultra-high stress level of 1500 MPa. At room temperature, the superelastic response with 4% total strain was obtained even when high stress level of 2000 MPa is applied after 550 °C 3 h aging.

Original languageEnglish
Pages (from-to)93-100
Number of pages8
JournalMaterials Science and Engineering A
Volume678
DOIs
Publication statusPublished - 2016 Dec 15

Keywords

  • High strength shape memory alloy
  • Multiple step phase transformation
  • Ni-rich NiTi shape memory alloy
  • R-phase transformation
  • Thermomechanical loading

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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