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Shape Memory and Superelasticity

, Volume 4, Issue 4, pp 428–434 | Cite as

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

  • Ryosuke Kainuma
  • Yohei Yoshinaka
  • Toshihiro Omori
Article
  • 64 Downloads

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.

Keywords

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

Notes

Acknowledgements

The authors acknowledge support from JSPS KAKENHI Grant Numbers JP15H05766 and JP17H03405.

Supplementary material

40830_2018_188_MOESM1_ESM.tif (20 kb)
Shape of the sample for the cyclic tensile test. Supplementary material 1 (TIFF 20 kb)
40830_2018_188_MOESM2_ESM.tif (61 kb)
Diagram of cyclic heat treatment (CHT) for obtaining a single crystal.. Supplementary material 2 (TIFF 61 kb)
40830_2018_188_MOESM3_ESM.tif (101 kb)
Inverse pole figures (a) to (e) of tensile loading direction in Samples A to E, respectively. Fig. (f) shows tensile direction dependence on transformation strain reported by Sutou et al. [6].. Supplementary material 1 (TIFF 102 kb)
40830_2018_188_MOESM4_ESM.tif (38 kb)
Definitions of the transformation critical stress, σc, the stress hysteresis, σhys, the dissipated energy, Ediss , and the residual strain, εres in a stress-strain curve. Supplementary material 1 (TIFF 39 kb)

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Copyright information

© ASM International 2018

Authors and Affiliations

  1. 1.Department of Materials Science, Graduate School of EngineeringTohoku UniversitySendaiJapan

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