Loading frequency and temperature-dependent damping capacity of NiTiHfPd shape memory alloy

Guher P. Toker, Soheil Saedi, Emre Acar, Osman E. Ozbulut, Haluk E. Karaca

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Superelastic shape memory alloys with ultra-high-strength, large mechanical hysteresis, and the ability to recover large deformations are promising materials for damping applications. In this study, the superelastic response and damping capacity of quaternary Ni45·3Ti39.7Hf10Pd5 polycrystalline alloys are investigated in terms of temperature and loading frequency dependency. It is shown that this alloy can show fully recoverable superelastic behavior with strain amplitude of 6–7% from −40 °C to 80 °C after heat treatments. The damping capacity of 550°C-3h aged alloy at 20 °C was 22.5 J/cm3 for quasi-static loading which decreased to 12.5 J/cm3 under 1 Hz loading frequency. At the high temperature of 80 °C the damping capacity was determined 9.2 J/cm3 under quasi-static loading and 4 J/cm3 under 1 Hz loading frequency. The decrease in damping capacity with loading frequency and temperature is linked to: the changes in local temperature of the specimen which significantly increases critical stress for reverse transformation while not affecting the critical stress for forward transformation, improved compatibility of transforming phases, and decrease in the contribution of superelastic strain to the total recovered strain.

Original languageEnglish
Article number103565
JournalMechanics of Materials
Volume150
DOIs
StatePublished - Nov 2020

Bibliographical note

Funding Information:
This research is partially supported by the National Science Foundation under Grant Number CMMI-1538770 .

Publisher Copyright:
© 2020 Elsevier Ltd

Keywords

  • Damping capacity
  • Latent heat
  • Loading frequency/rate effect
  • Shape memory alloys
  • Stress/mechanical hysteresis

ASJC Scopus subject areas

  • Materials Science (all)
  • Instrumentation
  • Mechanics of Materials

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