Internal friction caused by the intrinsic properties of dislocations

ciislocations are revieved. The principal theoretical rodels For the in t r ins i c c;islocations relaxations and the Snoek-KiSster relaxation are presented in outl ine. %cent important experinental resul ts, zainly on f.c.c., h.c.2. and b.c.c. metals, are exaslined and compared with the theoretical yedic t ions. i. Introduction.- In 1949, Bordoni ( I) observed an internal Friction (IF) peak i n f.c.c. metals which could only be at tr ibuted to d i s loca t io r; ~ and was associated with double-kink generation (DKG) by Seecer ( 2). From the relaxation enthal py of 3ordoni peaks, estimates of the Peierls s t ress can be obtained. The relat ively high value found fo r the T.c.cls has persuaded several authors tha t the 3ordoni peaks shoul