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Morphological analysis of pores in directionally freeze-cast titanium foams

Published online by Cambridge University Press:  31 January 2011

J.L. Fife ,
J.C. Li ,
D.C. Dunand  and
P.W. Voorhees
J.L. Fife
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208-3108
J.C. Li
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208-3108
D.C. Dunand*
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208-3108
P.W. Voorhees
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208-3108
*
a) Address all correspondence to this author. e-mail: dunand@northwestern.edu
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Abstract

Synchrotron x-ray tomography was performed on titanium foams with aligned, elongated pores, initially created by sintering directionally freeze-cast preforms using two different powder sizes. Three-dimensional reconstructions of the pore structures were analyzed morphologically using interface shape and interface normal distributions. A smaller powder size leads to more completely sintered titanium walls separating the dendritic pores, which in turn created a more compact distribution of pore shapes as well as stronger pore directionality parallel to the ice growth direction. The distribution of pore shapes is comparable to trabecular bone reported in the literature, indicating the foam's potential as a bone replacement material.

Keywords

Cellular (material type)Powder metallurgyX-ray tomography
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 1 , January 2009 , pp. 117 - 124
Copyright
Copyright © Materials Research Society 2009

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