Aging behavior in Cu–Al–Be shape memory alloy
نویسندگان
چکیده
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 EM51.060.1 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. © 1999 American Institute of Physics. @S0021-8979~99!02101-5#
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