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The influence of diffusion on the two way shape memory effect (TWME) in Cu-Zn-Al polycrystals has been studied. The excess vacancy concentration which controls the diffusion velocity has been monitored by different heat treatments: (a) a slow air cooling and aging in the austenite prior to the transformation, leading to a low vacancy concentration; (b) a quench from 800 o C; and (c) a quench...
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