Grain size dependence of pseudoelasticity in polycrystalline Cu-Al-Mn-based shape memory sheets

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The effects of grain size on the stress-strain characteristics of Cu-Al-Mn-based pseudoelastic (PE) sheet specimens with various relative grain sizes d/t (d = grain size, t = sheet thickness) were investigated using cyclic tensile testing. The stress-strain characteristics such as the yield stress σy, work-hardening rate dσPE/dε and stress hysteresis of pseudoelasticity Δσ decreased, and the obtained maximum PE strain εPEMAX increased with increasing d/t. The σy, dσPE/dε, Δσ and εPEMAX plots as a function of d/t were divided into three regions. The critical points dividing the plots into the three regions were located at d/t ≈ 1 and d/t ≈ 2. These results can be explained from the standpoint of constraints between grains, depending on grain structure such as a fine equiaxed grain structure, a columnar-like grain structure and a fully columnar grain structure.

Original languageEnglish
Pages (from-to)3842-3850
Number of pages9
JournalActa Materialia
Issue number10
Publication statusPublished - 2013 Jun


  • Cu-base SMA
  • Grain size
  • Shape memory alloys (SMAs)
  • Stress-induced martensitic transformation
  • Superelasticity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys


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