Abstract
Notched and unnotched Charpy impact measurements have been made on two grades of hot pressed beryllium over a range of densities between 80% and 100% theoretical density. The beneficial effect of ≈ 5–10% porosity on notched impact properties is demonstrated and the effects of annealing out machine-induced surface stresses is shown. In unnotched specimens this annealing leads to an increase of a factor of six in absorbed energy. Possible reasons for this phenomenon are discussed.
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