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Investigation of Ageing Phenomena in CuAlNi Based Shape Memory Alloys

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Abstract:

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.

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Periodical:

Materials Science Forum (Volumes 537-538)

Pages:

129-136

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.537-538.129

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Online since:

February 2007

Authors:

Marton Benke, Valéria Mertinger, Erzsebet Nagy, Jan Van Humbeeck

Keywords:

Aging Treatment (AT), Shape Memory Alloy Actuator, Thermoelastic Martensitic Transformation

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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