THE PLASTIC DEFORMATION OF NEUTRON-IRRADIATED COPPER SINGLE CRYSTALS (in German)
The work hardening behavior and the surface phenomena of copper crystals irradiated with a neutron dose of 2 x at 90, 293, and 513 deg K and compared to the behavior of unirradiated crystals. The greatest differences between irradiated and unirradiated crystals occur at small strains. The critical shear stress increases with decreasing temperature as reported by other authors. Then follows a stage of discontinuous flow characterized by the formation of Luiders bands and no increase in work hardening. The total strain of this stage increases wlth decreasing temperature. In this stage, slip bands are formed consisting of about 50 single slip lines due to electron microscope evidence. ln stages ll and lH of the stress strain curve the work hardening rate is less than in unirradiated crystals. ln stage H the rate is independent of temperature. The stress at the beginning of stage lll decreases with increasing temperature. The axis of tension overshoots markedly across the symmetrical position. In stage II clusters of new slip lines are formed at first between the slip bands of the Luders bands; with increasing strain the slip line pattern resembles the structurized fine slip of unirradiated crystals. The reciprocal length of newly formed slip lines increases linearly with shear stress and shear strain, respectively. The newly formed slip lines are shorter than those formed under comparable conditions on unirradiated crystals. In stage III slip bands occur with cross slip between the individual fragments as in unirradiated crystals. An interpretation is given in terms of specific lattice defects formed by neutron irradiation. The interaction of these defects with dislocations and the reduction of the defects during the plastic deformation account for the special features of radiation hardening. (auth)
- Research Organization:
- Max-Planck-Institut fur Metallforschung, Stuttgart and Technische Hochschule, Stuttgart
- NSA Number:
- NSA-16-002290
- OSTI ID:
- 4833751
- Journal Information:
- Z. Metallk., Journal Name: Z. Metallk. Vol. Vol: 52
- Country of Publication:
- Country unknown/Code not available
- Language:
- German
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