|Author||Greenfield, I. G. ♦ Demos, J. R.|
|Source||United States Department of Energy Office of Scientific and Technical Information|
|Subject Keyword||METALS, CERAMICS, AND OTHER MATERIALS ♦ ANNEALING ♦ BGRR ♦ CONTROL ♦ COPPER ♦ DEFECTS ♦ DEFORMATION ♦ DIFFUSION ♦ DISLOCATIONS ♦ DISTRIBUTION ♦ ELECTRON MICROSCOPY ♦ EQUATIONS ♦ EXCITATION ♦ EXPANSION ♦ HEAT TREATMENTS ♦ INSTRUMENTS ♦ LATTICES ♦ MEASURED VALUES ♦ METALS ♦ MONOCRYSTALS ♦ NEUTRONS ♦ QUENCHING ♦ RADIATION DOSES ♦ RADIATION EFFECTS ♦ REACTORS ♦ RESEARCH REACTORS ♦ SHRINKAGE ♦ TEMPERATURE ♦ VARIATIONS ♦ VOLUME|
|Abstract||S>Two groups of copper single crystals of various orientations were irradiated with neutrons in the BNL reactor between 50 and 70 deg C; one group was exposed to 0 53 x 10/sup 18/ and the other 1.1 x 10/sup 18/ nvt (total epicadmium flux). An irradiated and nonirradiated crystal of each orientation were isothermally aunealed in a specially constructed dilatometer at temperatures ranging from 75 to 350 deg C, and the irreversible differential changes in length were measured. In addition, electron microscope studies were made of the size distribution of irradiation-produced prismatic dislocations after several of the annealing treatments. These experiments revealed that (1) a direct relationship exists between the magnitude of shrinkage after annealing treatments and the total neutron exposure, (2) during annealing dislocation loops decrease in diameter until they disappear, (3) the decrease in dislocation density is related to the volume shrinkage, (4) the changes in loop distribution could be predicted by a line-tension-climb equation, and (5) the activation energy for the annealing of irradiationproduced loops lies between 2.08 ev and 2.10 ev. The results indicated that the annealing process in neutronirradiated copper is not the same as that observed in quenched metals although a self-diffusion mechanism appears to be the controlling factor. (auth)|
|Learning Resource Type||Article|
|Publisher Department||Franklin Inst., Philadelphia|
|Organization||Franklin Inst., Philadelphia|
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