The internal f r i c t i o n has been measured i n the martensitic phase of NiTi(Cu) alloys a t 1 Hz and 4 kHz. The d e t a i l e d study of the s t r a i n amplitude dependence of the internal f r i c t i o n and the whole spectrum as a function of the temperature i n the martensitic phase have a1 lowed t o a t t r i b u t e t o dislocations t h e main source of internal f r i c t i o n .
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