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Aging behavior in Cu-Al-Be shape memory alloy
Somoza, Alberto; Romero, Ricardo; Mañosa, Lluís; Planes Vila, Antoni
Universitat de Barcelona
This article reports positron annihilation spectroscopy and calorimetric measurements of the aging behavior in a Cu¿Al¿Be shape memory alloy. An excess of single vacancies is retained in the alloy as a result of a quench. All vacancies in excess disappear after long aging time, and a migration energy EM = 1.0±0.1 eV for this process has been found to be larger than in other Cu-based shape memory alloys. The good correlation found for the concentration of vacancies and the shift in the martensitic transition temperature demonstrates that, in Cu¿Al¿Be, changes in the transition after a quench are deeply related to the excess of vacancies.
Transformacions martensítiques
Ciència dels materials
Martensitic transformations
Materials science
(c) American Institute of Physics, 1999
Article
American Institute of Physics
         

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