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- W75291451 abstract "The influence of copper on the crack surface energy and on the path of cleavage cracks parallel to basal planes in zone-refined beryllium single crystals was investigated. At 77 K the crack surface is very smooth, thus the propagation energy of cleavage cracks, which is independent of the copper content is only about twice that of the surface energy of the basal planes. At room temperature extensive plasticity in front of the crack tip yields much higher crack propagation energy than at lower temperatures. The influence of copper on the plasticity is divided in two ranges. In range 1, in which the crack surface energy increases with increasing copper content, the crack propagation is controlled by prism slip. In range 2, the controlling factor is the twinning energy. With increasing copper content, the twinning energy decreases thereby lowering the crack surface energy. (Author) (GRA)" @default.
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- W75291451 date "1975-05-01" @default.
- W75291451 modified "2023-09-24" @default.
- W75291451 title "Influence of copper on crack propagation in beryllium single crystals" @default.
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