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Volume fraction of a constituent or phase was estimated in six specimens of conventional and directionally solidifed eutectic alloys in accordance with ASTM Recommended Practice for Determining Volume Fraction by Systematic Manual Point Count (E 562–76). Volume fractions determined ranged from 0.086 to 0.36, and with one exception the 95% relative confidence limits were approximately 10% of the determined volume fractions. Since the confidence limit of 10%, which had been arbitrarily chosen previously, was achieved in all but one case, this application of Recommended Practice E 562-76 was considered successful.
HeadMember of ASTM, Electron Optics and Microscopy Unit, NASA Lewis Research Center, Cleveland, Ohio
Stock #: JTE10914J