Anomalies of the plastic deformation of solid parahydrogen
A. N. AleksandrovskiĩPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovE. A. Kir’yanovaPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovV. G. Manzheliı̆Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovА. В. СолдатовPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovA. M. TolkachevPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov
ABI
Аннотация
The work hardening curves σ(ϵ) of special-purity parahydrogen single crystals are obtained in the temperature range 2−6 °K at very low stresses (σ = 5·10−2 g/mm2). Our study reveals a number of anomalies, in particular an effect whereby a sample recovers its dimensions after plastic deformation reaching 7%. The work hardening curves of solid neon are also obtained for comparison. The gravity-induced downward flow of parahydrogen single crystals at helium temperatures mentioned in the literature has not been observed.
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