The internal friction and dynamic modulus of W single crystals were measured after neutron irradiation near liquid-helium temperature. The results on dislocation pinning and the associated relaxation peaks suggest that in W the $〈110〉$ split interstitials perform a free migration at {~} 15 K (substage I₁) and the {~} 30-K stage (substage I₂) is associated with detrapping of the $〈110〉$ split interstitials from impurity atoms.
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Okuda et al. (1975) studied this question.
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