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Improved tensile creep properties of yttrium- and lanthanum-doped alumina: a solid solution effect

Published online by Cambridge University Press:  31 January 2011

Junghyun Cho ,
Chong Min Wang ,
Helen M. Chan ,
J. M. Rickman  and
Martin P. Harmer
Junghyun Cho
Affiliation:
Materials Research Center and Department of Materials Science and Engineering, 5 E. Packer Avenue, Lehigh University, Bethlehem, Pennsylvania 18015
Chong Min Wang
Affiliation:
Materials Research Center and Department of Materials Science and Engineering, 5 E. Packer Avenue, Lehigh University, Bethlehem, Pennsylvania 18015
Helen M. Chan
Affiliation:
Materials Research Center and Department of Materials Science and Engineering, 5 E. Packer Avenue, Lehigh University, Bethlehem, Pennsylvania 18015
J. M. Rickman
Affiliation:
Materials Research Center and Department of Materials Science and Engineering, 5 E. Packer Avenue, Lehigh University, Bethlehem, Pennsylvania 18015
Martin P. Harmer
Affiliation:
Materials Research Center and Department of Materials Science and Engineering, 5 E. Packer Avenue, Lehigh University, Bethlehem, Pennsylvania 18015
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Abstract

The tensile creep behavior of yttrium- and lanthanum-doped alumina (at dopant levels below the solubility limit) was examined. Both compositions (100 ppm yttrium, 100 ppm lanthanum) exhibited a uniform microstructure consisting of fine, equiaxed grains. The creep resistance of both doped aluminas was enhanced, compared with undoped alumina, by about two orders of magnitude, which was almost the same degree of improvement as for materials with higher dopant levels (in excess of the solubility limit). In addition, measured creep rupture curves exhibited predominantly steady-state creep behavior. Our results, therefore, verified that the creep improvement in these rare-earth doped aluminas was primarily a solid-solution effect.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 2 , February 2001 , pp. 425 - 429
Copyright
Copyright © Materials Research Society 2001

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