Investigation of Ageing Phenomena in CuAlNi Based Shape Memory Alloys


Article Preview

The ageing phenomena and its effect on the thermoelastic martensitic transformation was investigated in three Cu-base SMAs. The transformation temperatures shifted to higher temperatures due to aging in the beta-phase. To increase the alloy’s ductility, a definite amount of Mn (4 wt%) and Fe (2 wt%) were added to the ternary alloy. The thermoelastic martensitic transformation was found in the not-aged samples of the CuAlNiMn and CuAlNiMnFe alloys. This transformation was destroyed due to ageing heat treatments by a fairly unknown exothermic process. The thermoelastic martensitic transformation appeared again in the aged CuAlNiMn and CuAlNiMnFe samples after keeping them on room temperature for a few months. This phenomena was investigated by DSC, SEM, TEM, and XRD.



Materials Science Forum (Volumes 537-538)

Edited by:

J. Gyulai and P.J. Szabó




M. Benke et al., "Investigation of Ageing Phenomena in CuAlNi Based Shape Memory Alloys", Materials Science Forum, Vols. 537-538, pp. 129-136, 2007

Online since:

February 2007




[1] K. Otsuka, C. M. Waymann: Shape Memory Materials, Cambridge University Press, 1998, pp.27-49, 105-109, 184-189, 199-201, 203-206, 223.

[2] H. Funakubo: Shape Memory Alloys, OPA (Amsterdam), 1987, pp.1-57.

[3] Shape Memory Alloys, virtualskies. arc. nasa. gov/research/youDecide/shapeMemAlloys. html.

[4] K. Otsuka, X. Ren: Mechanism of Martensite Aging Effect, Scripta Materialia, 50 (2004) 207-212.

DOI: 10.1016/j.scriptamat.2003.09.013

[5] T. Daricek, J. Lasek, N. Zarubova, V. Novak, P. Bartuska: Ageing Effects in a Cu-Al-Ni Shape Memory Alloy, Journal De Physique, IV France, 11, (2001).

DOI: 10.1051/jp4:2001831

[6] N. Zárubová, A. Gemperle, V. Novák: Ageing Phenomena in a Cu-Al-Ni Alloy, Journal De Physique, IV France 7, (1997).

DOI: 10.1051/jp4:1997544

[7] N. Zarubová, A. Gemperle, V. Novák: Initial Stages of γ2 Precipitation in an Aged Cu-AlNi Shape Memory Alloy, Materials Science and Engineering A222, 1997, 166-174.

DOI: 10.1016/s0921-5093(96)10520-7

[8] : V. Recarte, J. I. Pérez-Landazábal, A. Ibarra, M. L. Nó, J. San Juan: High Temperature β Phase Decomposition Process in a Cu-Al-Ni Shape Memory Alloy, Materials Science Acknowledgements The authors would like to say thank you for the Department of Solid State Physics of the University of Debrecen especially for Lajos Daróczi for the TEM investigations and for the ideas and notions. We say thank you for Dóra Janovszky and Ferenc Tranta from the Department of Physical Metallurgy and Metal Forming of the University of Miskolc for their help in the DSC investigations and their notions.

DOI: 10.1016/j.msea.2003.09.111

Fetching data from Crossref.
This may take some time to load.