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The Development of Vacancies during Severe Plastic Deformation

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Figure

Fig. 2A schematic illustration of the positron annihilation photo-peak. TheS parameter is defined as the ratio of the central area of the annihilationpeak Ac (filled by grey colour) and the net peak area
Table 1Lifetimes and relative intensities of exponential components resolved in LT spectra of UFG metals prepared by HPT using N = 5revolutions.62) PAS measurements were performed in the central region of the sample disk
Fig. 3Bright field TEM micrographs of (a) HPT deformed Mg; (b) HPT deformed Cu.
Fig. 4Calculated lifetimes of positrons trapped at vacancy clusters plotted as a function of the number of vacancies in the cluster: (a) bccmetals; (b) fcc metals; (c) hcp metals.62)
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