Dislocation Relaxation And Alloy Softening Of Bcc Alloys

Recently, low-frequency internal friction measurements on a series of Fe-Cr alloys by Konstantinovic and Terentyev [M.J. Konstantinovic and D. Terentyev, Mater. Sci. Eng. A 521-522 (2009) p. 106] have demonstrated that increasing Cr concentrations lead to an increase in the strength of the beta-relaxation at the cost of the gamma-relaxation (Chambers' notation). In the same concentration and temperature regime, the alloys show alloy softening. It is argued that both phenomena are due to the same process, namely the influence of foreign atoms on the transformation of the cores of a(0)< 111 >/2 screw dislocations from their low-temperature configuration, capable of forming kink pairs on {1 1 0} planes, to their high-temperature configuration with kink-pair generation on {2 1 1} planes.