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Journal of Materials Science

, Volume 41, Issue 17, pp 5455–5461 | Cite as

Study of γ2 precipitation in Cu–Al–Be shape memory alloys

  • M. T. Ochoa-Lara
  • H. Flores-Zúñiga
  • D. Rios-Jara
Article

Abstract

Thermal aging between 250 and 500 °C of ordered β phase in a polycrystalline Cu–Al–Be shape memory alloy were performed, and the formation of phase γ2 was studied with optical and transmission electron microscopies and XRD techniques. The growth of γ2 phase shows a polynomial behavior, and Avrami curves as well as a Time–Temperature–Transformation diagram were constructed from these results. In addition, the formation of stable γ2 precipitates was studied in aged Cu–Al–Be ribbons. The presence of α regions surrounding γ2 precipitates for longer aging times at higher temperatures was observed, giving a consistent precipitation scheme.

Keywords

Shape Memory Alloy Aging Temperature Martensitic Transformation Temperature Longe Aging Time Polynomial Behavior 

Notes

Acknowledgements

The authors wish to thank Armando Reyes for his invaluable help with X-ray characterizations. The authors also thank CONACYT—Mexico for the financial support given to this project.

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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  • M. T. Ochoa-Lara
    • 1
  • H. Flores-Zúñiga
    • 1
  • D. Rios-Jara
    • 1
    • 2
  1. 1.Centro de Investigación en Materiales Avanzados, CIMAVChihuahua, Chih.Mexico
  2. 2.Instituto de Investigaciones en Materiales, UNAMCiudad UniversitariaMexico D.F.Mexico

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