Change in the dislocation structure during the fatigue of nickel previously deformed by extension

Microstructural response of pure copper to cryogenic rolling

“…The microhardness decreased significantly after 6 months and was then found to be relatively unchanged. This result agrees well with literature data [21][22][23], thus demonstrating that recrystallization in the present work probably occurred after cryogenic rolling. In addition, it was found that the microhardness of the initial material (after warm "abc"-deformation) also decreased substantially with time at ambient temperature (Fig.…”

“…The occurrence of recrystallization in cryogenically deformed copper has been reported previously and attributed to the warming of the material to room temperature after deformation [21][22][23]. It is believed that static recrystallization is induced by a high concentration of defects (primarily vacancies) in the deformed material which significantly enhances grain-boundary mobility and serves as the driving force for boundary migration [21].…”