THE INFLUENCE OF PROCESSING VARIABLES, ON THE EXTENT OF MAGNETICALLY INDUCED RECOVERY IN NICKEL

Doppler broadened positron annihilation spectroscopy has been used to investigate the effects of pulsed magnetic fields on the defect struct ure of heavily cold-worked nickel samples. The experimental variables investigated are processing temperature (-196 to 100 degrees C) and th e relationship between the external field direction and sample texture . The key results are: (i) the maximum extent of magnetically induced recovery occurs at an intermediate temperature of around -80 degrees C , and (ii) the extent of magnetically induced recovery can be increase d if the sample is subjected to multiple magnetic treatments conducted at different field/sample orientations.