Abstract
Various possible sources are examined for the high strength at low temperature of the common refractory b.c.c. metals. Of the two most likely possibilities, lattice hardening and impurity hardening, the former can unambiguously be shown not to be controlling in certain cases, while an impurity hardening model describes in considerable detail the experimental results in a wide variety of materials. The distinguishing feature of the defects to which hardening is attributed is that they produce large, asymmetrical distortions which interact strongly with mobile dislocations.
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