Cyclic stress-strain response of directionally solidified polycrystalline Cu-Al-Ni shape memory alloys

Huadong Fu, Sheng Xu, Huimin Zhao, Hongbiao Dong, Jianxin Xie

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Our previous study developed a polycrystalline Cu-Al-Ni alloy by directional solidification, which exhibits excellent superelasticity. To further verify the application feasibility of the Cu-Al-Ni alloy, cyclic superelastic behaviors of the alloy under varying loading frequencies and strain amplitudes were investigated in this study. The results show that the superelasticity of the polycrystalline Cu-Al-Ni alloy has ultra-low dependence on loading frequency in a range of 0.005∼5 Hz. The alloy can sustain over 2000 tensile cycles at the applied total strain of 4%, exhibiting 1750 cycles and 825 cycles for total strain of 6% and 8%, respectively. The normalized critical stress and strain vary only ∼10% and ∼0.03% after 2000 times of loading-unloading with a strain amplitude of 4%. Compared with the commercial polycrystalline Ni-Ti alloy, the directionally solidified Cu-Al-Ni alloys with columnar grains exhibit excellent cyclic stress-strain response and fatigue life, which are promising materials for energy absorption and seismic protection structures or components.

Original languageEnglish
Pages (from-to)154-159
Number of pages6
JournalJournal of Alloys and Compounds
Volume714
DOIs
Publication statusPublished - 2017
Externally publishedYes

Keywords

  • Cu-Al-Ni alloy
  • Fatigue resistance
  • Shape memory alloys
  • Superelasticity

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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