Abstract
The effect of ultrasonic agitation during solidification was studied for three systems: , , and . Reduction in grain size was most pronounced in ; the other compositions showed relatively little refinement. A definite tendency for alignment of acicular grains with low intensities of ultrasonic irradiation was noted in all three systems. Compressiye fracture stress was increased by agitation for all three systems with considerable anisotropy of strength, relative to the growth direction, occurring in agitated and unagitated material. Highest fracture strength was found in , 7000 vs. 5000 psi for unagitated material. Reduction in length was about equal at 3%. Seebeck coefficient and resistivity were measured as functions of temperature and found to exhibit a difference between agitated and unagitated material which correlated with the amount of grain refinement observed. This is a result of the crystallographic anisotropy of electrical properties in alloys, reflected by the degree of misorientation caused by ultrasonic agitation.
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