Effect of Co addition on the ordering and martensitic transformations in Cu-Al-Mn shape memory alloys

Y. Sutou, R. Kainuma, K. Ishida

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)

Abstract

The effect of Co addition on the order-disorder transition temperature, Ms temperature, ductility, hardness and the shape memory properties of ductile Cu-Al-Mn shape memory (SM) alloys was investigated by differential scanning calorimetry (DSC), cold-rolling, and tensile test techniques. It was found that the addition of Co to the Cu-Al-Mn alloys stabilized the B2 phase and decreased the Ms temperature. In the Cu71Al17Mn10Co2 alloy, the B2 to L21 ordering transformation was suppressed by quenching from 900 °C and the retained B2 parent phase transformed to the 6 M martensite. In several other alloys of this system, the presence of the CoAl (B2 type) precipitate phase was observed. Even though the CoAl precipitate caused a decrease in the cold-workability and the degree of elongation, it nonetheless improved the SM and pseudoelastic (PE) properties of the alloy by solid solution or/and precipitation hardening.

Original languageEnglish
Pages (from-to)473-476
Number of pages4
JournalMaterials Science Forum
Volume327
DOIs
Publication statusPublished - 2000
EventProceedings of the 1999 International Symposium and Exhibition on Shape Memory Materials (SMM'99) - Kanazawa, Jpn
Duration: 1999 May 191999 May 21

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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