The structure and hardness of a molybdenum single crystal with an (110) orientation, which was deformed by high pressure torsion at 290 and 80 K, are investigated. Such deformation mechanism as dislo cation slip that is characteristic of materials with a high stacking fault energy works also during cryogenic deformation: twinning does not occur. At both temperatures, the single crystal transforms into a polycrystal line state at a true strain e ≈ 2. Up to the maximum achievable true strains, no uniform in size submicrocrys talline structure forms in molybdenum.
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