A b s t r a c t . -The damping p r o p e r t i e s of Fe-Cr and Fe-Cr based a l l o y s have been i n v e s t i g a t e d by t h e c a n t i l e v e r method and t h e r e s o n a n t b a r method. The change i n damping c a p a c i t y i s s t u d i e d a s a f u n c t i o n of s e v e r a l p a r a m e t e r s i n c l u d i n g t e m p e r a t u r e , magnetic f i e l d , c o l d work and h e a t t r e a t m e n t . The r e s u l t s a r e c o r r e l a t e d w i t h measurements of t h e c o

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... e r c i v e f o r c e . Binary Fe-Cr a l l o y s w i t h 12-14 % C r e x h i b i t e d damping c a p a c i t i e s a s h i g h a s 80 % when h e a t t r e a t e d a t 1200°C w h i l e t h e a l l o y Fe-12Cr-3A1 a l r e a d y e x h i b i t e d damping c a p a c i t i e s of t h e o r d e r of 40-60 % when h e a t t r e a t e d a t t e m p e r a t u r e s above 750°C.