Abstract
The plastic deformation of both strain-anneal grown and melt-grown tungsten single crystals of various orientations and high purity was investigated in the temperature range of 77°K–450°K. It is concluded that: 1. (a) the temperature sensitive yield strength is due to a lattice friction stress, li(b) The very high rates of strain hardening in all orientations can neither be due to the building up of an internal stress, nor due to the accumulation of defects on screw dislocations; it must be due to an insufficiently understood process of exhaustion of mobile dislocations, 2. (c) An anisotropy of the lattice friction stress exists on the {112} planes which produces slip on unexpected slip systems and gives rise to different flow stresses in tension and compression in [001]and [110]oriented crystals.
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