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A study of ageing effects on the structure of Cu-Zn-Sn shape memory alloys was performed using the ^{119}Sn Mössbauer spectroscopy and positron annihilation techniques (the positron lifetime, and Doppler broadening line-shape S-parameter measurements). Two stages of ageing at 200°C connected with redistribution of Sn atoms were observed.
Positron lifetime spectra were measured in the quenched or slowly cooled Cu-3.93 at.% Ag alloy, subjected to subsequent cold rolling, as a function of isochronal annealing temperature. The results were compared with the formerly obtained data for quenched, but not deformed, C͟u-Ag alloy and for deformed C͟u-Ge solid solution. All lifetime spectra, after background and source corrections, are single...
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