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