2008 Volume 49 Issue 8 Pages 1800-1805
Anelastic recovery of pure magnesium at room temperature was investigated in cyclic compression-quick unloading-recovery process where acoustic emission (AE) measurement was applied to analyze the dynamic behaviour and mechanism of anelastic recovery process. By analyzing the RMS voltage of AE signals from both the background and the recovery process, it was observed that the recovery process was accompanied with a gradual decrease in the strength of AE signals. The AE signals in recovery processes of different strain levels seem to be due to the same source of detwinning process because the same slope between amplitude and logarithmic AE count of AE signals in different strain levels was found in the strong elastic waves related to detwinning process. The AE behaviors in recovery process were described in details by AE count rate and AE incubation time. The relations between twinning or detwinning and AE counts in both deformation and anelastic recovery process could be expressed by a general equation.
