Failure of single crystals of beryllium

1. The failure energy of beryllium crystals on the (0001) and\((10\bar 10)\) basic cleavage planes is significantly more than the specific surface energy of the corresponding planes. 2. With an increase in temperature the value of γ (0001) ef increases, especially sharply in the 300 °K temperature range. 3. The temperature relationship of\(\gamma _{(\alpha 1\bar 20)}^{ef} \) has an extreme character related most likely to features of plastic deformation in primsatic slip. 4. In the\(\tau _{(10\bar 10)} /\tau _{(0001)} \) temperature relationship there is observed a sharp peak leading to the fact that in the 300 °K temperature area basal slip dominates and the roughness of the (0001) plane drops sharply. 5. The failure energy of polycrystalline beryllium is an order of magnitude higher than γ (0001) ef .