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Grain Size Estimation in Anisotropic Materials

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Abstract:

The estimators proportional to (NA(x,y)NA(x,z)NA(y,z))1/2 and (NL(x)NL(y)NL(z)) obtained by profile and intercept counts are recommended by ASTM Standards E 112 for 3D grain intensity l of anisotropic grain structures (NA(•) are estimated in three mutually perpendicular planes suitably oriented with respect to the prevailing anisotropy direction and NL(•) are intercept intensities along three suitably selected mutually perpendicular directions). However, l is also related to the profile and intercept intensities l', l', namely l= c'(l')3/2= c'(l')3. The induced intensities are estimated by arithmetic means NA = (NA(x,y)+NA(x,z)+NA(y,z))/3, NL = (NL(x)+NL(y)+NL(z))/3. A simple model isdeveloped, in which the role of geometric and arithmetic means of profile and intercept counts in the grain size estimation is elucidated. Its results are compared with computer simulated random tessellations with prevailing rod-like and plate-like cells and applied to anisotropic grain structures of pure Al produced by ECAP and to platinum based composite Pt - 0.5 Y2O3.

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Periodical:

Materials Science Forum (Volume 482)

Pages:

239-242

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.482.239

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Online since:

April 2005

Authors:

Ivan Saxl, Petr Ponížil, Katarína Sülleiová

Keywords:

3D Grain Size, Intercept Count, Profile Count, Voronoi Tessellations

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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References

[1] Saxl I., Ponížil P.: In: L. Wojnar, K. Rozniatowski (eds. ): STERMAT'2000, Proc. Sixth Int. Conf. Stereology and Image Analysis in Materials Science, Cracow 20. - 23. 9. 2000. Polish Society for Stereology, Cracow 2000, 373-378, 379-384.

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[2] Saxl I., Ponížil P.: Materials Characterization 42, (2001), 1-6.

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[3] Saxl I., Sülleiová, K., Ponížil P.: Kovové materiály, 39, (2001), 396 - 409.

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[4] ASTM E-112: Standard Methods for Determining Average Grain Size. ASTM 1982, 1988. 1 This research was supported by the Grant Agency of the Czech Republic (contract No. 201/03/0946 - I.S. ) and by the Slovak Agency for Science VEGA (contract No. 2/2144/22 -K.S. ).

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