Abstract
Electron microscopy has been used extensivley to investigate annealing processes in metals, but most of the work refers to cold-worked materials. Only a limited amount of information has been published concerning the microstructural changes occurring during annealing of explosively shockloaded metals. It is known, however, that the small extent of permanent deformation and the very high densities of lattice defects induced by shock-loading of metals, particularly at high explosive pressures, results in thermal recovery processes which are quite different from those occurring in conventionally deformed metals. The present study was concerned with the microstructure of pure polycrystalline nickel after explosive shock treatment at 70, 320 and 1000 kb and subsequent heat treatments between 600 and 780°C.
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