DISLOCATION DISTRIBUTIONS IN FATIGUED SINGLE CRYSTALS OF 3.25% SILICON-IRON.
NORTHWESTERN UNIV EVANSTON ILL DEPT OF MATERIALS SCIENCE
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Fatigue tests were performed on single crystals of 3.25 silicon-iron oriented for single slip. The behavior of dislocations was studied in the early stages of the fatigue process as a function of temperature, number of cycles, and state of stress. A particular emphasis was placed upon observing tangle formation and growth. Part of the tests were performed by cycling about a zero mean stress in 4-point bending. Crystals were fatigued in this manner for various numbers of cycles at both 298K and 495K. The dislocation distributions were investigated by the etch pit technique and electron transmission microscopy. The remainder of the tests were performed in alternating tension. As before, cyrstals were fatigued for various numbers of cycles at both 298K and 425K. In this case, the dislocation distributions were investigated solely by electron transmission microscopy.