Atomic displacements in low temperature irradiated chromium crystals

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Abstract
Monocrystalline specimens of chromium, cut parallel to the (100), (110) and (111) planes, have been irradiated with electrons in the energy range 0.48-1.7 MeV. The threshold energy for atomic displacement is found to be about equal in the two crystallographic directions < 100 > and < 111 >, although the mechanisms for displacement may be quite different in the two cases. The recovery of the defects has been studied up to 60 K, and after irradiations at 0.5,0.525 and 0.75 MeV. The anisotropy of the different substages appears to bear some resemblance to the low temperature recovery of tungsten. A tentative attribution is given for the various substages up to 40 K