DEFORMATION AND FRACTURE OF CADMIUM AND CADMIUM-MAGNESIUM ALLOYS
COLUMBIA UNIV NEW YORK
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An attempt was made to determine the mechanisms of deformation and fracture in polycrystalline Cd, to correlate these mechanisms with pertinent aspects of single crystal behavior, and to determine whether the slip systems and mode of fracture of polycrystalline Cd could be altered by reduction of the axial ratio 1.886 byALLOYING. Tests on polycrystalline Cd and Cd-Mg alloys indicated that the yield stress, flow stresses for arbitrary small strains, and the average coefficient of work hardening were relatively insensitive to temperature from room temperature to 4.2 K. The tensile strength of Cd was strongly temperature dependent but relatively independent of grain size between room temperature and -175C below-175C it was dependent on grain size, but not on temperature. Cd had a ductile to quasi-brittle transition at about -155C which did not depend on grain size or purity. The minimum ductility, about 15 reduction in area, was reached near -196 and persisted at -269C.