Characteristic grain size: Part I description and definition

Abstract

Characteristic grain size, G_c, is defined in the present paper. It indicates an intrinsic size of grain for a given system, and has the following advantages over the average grain size which is based on a statistical mean value of the linear intercept length of grains: (1) The characteristic grain size G_c has clear and determined geometric meaning, i. e. G_c refers to two times of the area-weighted average height of the surface elements to the centroid of grain or the average length of the chord through the centroid of grain; (2) The value of G_c can be directly obtained without introducing any correcting factors such as grain shape or grain size distribution factors. Generally, G_c is larger than the average grain size G when the Heyn intercept method is adopted for the grain size measurement.

Keywords

characteristic grain size / definition / description

References

[1] Vander Voort G F. Examination of some grain size measurement problems. Metallography: Past, Present, and Future. American Society for Testing and Materials (75th Anniversary Volume), 1993.266–294

[2] HanJ H, KimD Y. Analysis of the proportionality constant correlating the mean intercept length to the average grain size. Acta Metall Mater, 1995, 43(8): 3185-3188

[3] DormansL J M G, MorrelR, WillG D. A round robin on the measurement of alumina grain size. Journal of the European ceramic Society, 1993, 12(1): 205-213

[4] UnderwoodE EQuantitative stereology, 1970, Massachusetts, Addison-Wesely Publishing Company: 30-34

[5] StephenB, MatinH. Grain growth kinetics for alumina in absence of a liquid phase. Journal of the American Ceramic Society, 1985, 68(1): 22-24

[6] GuptaT K. Possible correlation between density and grain size during sintering. Journal of the American Ceramic society, 1972, 55(5): 276-277