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Numéro
J. Phys. IV France
Volume 11, Numéro PR8, Novembre 2001
Fifth European Symposium on Martensitic Transformations and Shape Memory Alloys
Page(s) Pr8-487 - Pr8-492
DOI http://dx.doi.org/10.1051/jp4:2001881
Fifth European Symposium on Martensitic Transformations and Shape Memory Alloys

J. Phys. IV France 11 (2001) Pr8-487-Pr8-492

DOI: 10.1051/jp4:2001881

High temperature Cu-Al-Nb - based shape memory alloys

J. Lelatko and H. Morawiec

Institute of Physics and Chemistry of Metals, University of Silesia, 40007 Katowice, Bankowa 12, Poland


Abstract
New type of Cu-Al-Nb - base alloys containing nickel, cobalt and chromium with high martensitic transformation temperatures have been developed. In this paper the mechanical properties, shape memory characteristics, the temperatures of reversible martensitic transformation and thermal stability of these alloys are presented. Introducing chromium and specially nickel and cobalt to the Cu-Al-Nb alloys gives a possibility to decrease the characteristic temperatures. However, these elements create in the martensitic matrix primary particles of intermetallic phases such as AlCo and NiAl and change the chemical composition of the Nb(,Al,Cu)2 - the main phase in the ternary Cu-Al-Nb alloy. Presence of precipitates results in decrease of the elongation of these alloys. Nickel and cobalt improve the thermal stability and resistance to decomposition.



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