Abstract
By the use of a new-designed internal friction instrument, automatically controlled by a microcomputer, in which specimen is heated by means of the radiation focusing of infrared ray and quenched by argon spraying, changes in internal friction and frequency during the course of bainitic transformations in 18Cr2Ni4WA steel and Cu-25.83Zn-3.96Al(wt%) alloy are measured. Experimental results show that there exists an internal friction peak associated with the lowering of frequency within the incubation period and Q −1 max increases and the time required for getting Q −1 max decreases with the decrease of the incubation period. It may be argued that the structural change within the incubation period is a nucleation process accompanying the local softening and/or lattice instability of the parent phase.
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