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Positron Annihilation Observations of Shot Peened Aluminum Alloys
Positron annihilation techniques are being used to an increasing extent to study various types of damage in crystalline materials. A growing body of data exists for damage caused by irradiation with neutrons and electrons, fatigue, quenching, and plastic deformation. The present note describes positron effects noted for the important metal surface treatment called shot peening. The results and their interpretation are limited, since only particular samples were available. However, it is hoped that reporting the effects will encourage further studies in this vein because firstly, both shot peening and positron annihilation are uniquely concerned with surfaces rather than with interior regions, and secondly because positron annihilation offers a non-destructive monitoring possibility for the important surface peening treatment. The Depth of the plastic deformation from peening is typically 0.4 mm whereas the depth of penetration of positrons in Al is typically less than 0.05 mm thus all of the positrons were annihilation well within the region of damage from the peening. (Author)
Positron Annihilation Observations of Shot Peened Aluminum Alloys
Positron annihilation techniques are being used to an increasing extent to study various types of damage in crystalline materials. A growing body of data exists for damage caused by irradiation with neutrons and electrons, fatigue, quenching, and plastic deformation. The present note describes positron effects noted for the important metal surface treatment called shot peening. The results and their interpretation are limited, since only particular samples were available. However, it is hoped that reporting the effects will encourage further studies in this vein because firstly, both shot peening and positron annihilation are uniquely concerned with surfaces rather than with interior regions, and secondly because positron annihilation offers a non-destructive monitoring possibility for the important surface peening treatment. The Depth of the plastic deformation from peening is typically 0.4 mm whereas the depth of penetration of positrons in Al is typically less than 0.05 mm thus all of the positrons were annihilation well within the region of damage from the peening. (Author)
Positron Annihilation Observations of Shot Peened Aluminum Alloys
S. Saterlie (author) / M. L. Johnson (author) / P. Alexopoulos (author) / R. Ure (author) / F. Seppi (author)
1977
7 pages
Report
No indication
English
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