The effect of tensile deformation on the damping capacity of NiTi shape memory alloy


Atli K. C.

JOURNAL OF ALLOYS AND COMPOUNDS, vol.679, pp.260-267, 2016 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 679
  • Publication Date: 2016
  • Doi Number: 10.1016/j.jallcom.2016.04.102
  • Journal Name: JOURNAL OF ALLOYS AND COMPOUNDS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.260-267
  • Keywords: Shape memory alloys, Internal friction, Mechanical testing, Damping, INTERNAL-FRICTION, TWINNED DOMAIN, BEHAVIOR, HYDROGEN, MARTENSITE, TRANSITION, BINARY
  • Anadolu University Affiliated: Yes

Abstract

The vibration damping capacity of a near-equiatomic NiTi shape memory alloy was characterized as a function of tensile deformation by utilizing dynamic mechanical analysis. The intrinsic internal friction (IF) values of the martensite phase (Q(int,m)(-1)) decreased with increasing deformation levels up to 10%, attributed to a decrease in the density of martensite variant and twin boundaries. Deformation increased the temperature of the transformation peak during the first reverse transformation of thermal cycling. A two-stage behavior was observed in terms of the IF values of the transformation peak. IF reached a peak value at 4%, dropped at 5% and monotonically increased again up to 10% deformation. Thermal cycling partially restored Q(int,m)(-1) levels and shifted the transformation peak close to its undeformed IF and temperature values during the second reverse transformation. (C) 2016 Elsevier B.V. All rights reserved.