Cyclic Properties of Superelasticity in Cu–Al–Mn Single-Crystalline Sheets with Bainite Precipitates

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Abstract

Microstructure, Vickers hardness and cyclic superelastic properties at room temperature were examined for Cu-Al-Mn single-crystalline sheets aged at 200 °C for various time periods. The bainite plates started to appear from about 9 ks and the density drastically increased from 18 to 30 ks and the Vickers hardness was strongly affected by the density of the bainite plates. In the sample with a little amount of bainite plates, the superelastic properties were basically similar to those in the bainite-free sample. In the samples with a high density of bainite, however, the transformation critical and hysteresis stresses and the dissipated energy were high and large for the initial stage of cycles, respectively. They drastically and monotonically decreased with increasing cycle number and the residual strain increased from the initial stage, unlike those in the bainite-free sample.

Original languageEnglish
Pages (from-to)428-434
Number of pages7
JournalShape Memory and Superelasticity
Volume4
Issue number4
DOIs
Publication statusPublished - 2018 Dec 15

Keywords

  • Bainite
  • Cu-Al-Mn
  • Cu-based shape memory alloy
  • Functional fatigue
  • Superelasticity

ASJC Scopus subject areas

  • Mechanics of Materials
  • Materials Science(all)

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