Effects of ageing on bainitic and thermally induced martensitic transformations in ductile Cu-Al-Mn-based shape memory alloys

Y. Sutou, N. Koeda, T. Omori, R. Kainuma, K. Ishida

Research output: Contribution to journalArticlepeer-review

68 Citations (Scopus)

Abstract

The effects of ageing at 473-573 K on the hardness, microstructure and thermoelastic martensitic transformation in Cu-Al-Mn-based shape memory alloys were investigated. It was found that hardness was dramatically increased by ageing due to the formation of fine bainitic plates and that the volume fraction of the bainite phase with ageing time can be described by the Austin-Rickett equation. The martensitic transformation temperatures decreased with the formation of bainite plates, mainly due to the composition change of the β-matrix. Moreover, the growth of thermally induced martensite plates was disturbed by the existence of bainite plates. Consequently, the transformation intervals (Ms-Mf and Af-As) and transformation hystereses (Af-Ms and As-Mf) increased with the progress of bainitic transformation.

Original languageEnglish
Pages (from-to)5748-5758
Number of pages11
JournalActa Materialia
Volume57
Issue number19
DOIs
Publication statusPublished - 2009 Nov

Keywords

  • Ageing
  • Bainitic transformation
  • Heusler alloys
  • Martensitic phase transformation
  • Phase transformation kinetics

ASJC Scopus subject areas

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

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