A method is proposed to measure the Secondary Dendrite Arm Spacing (SDAS) frommeasurements of dendrite arm intercept length, intercept counts, intersection counts and dendrite volumefraction. These measurements are made with an automatic image analysis device using images of dendritemicrostructure. The method eliminates much of the tedium associated with manual measurements, thuspermitting collection of large amounts of data and more extensive sampling. The end result is a betterstatistical definition of the secondary dendrite arm spacing.
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