Jh. Cho et al., EFFECT OF YTTRIUM AND LANTHANUM ON THE TENSILE CREEP-BEHAVIOR OF ALUMINUM-OXIDE, Journal of the American Ceramic Society, 80(4), 1997, pp. 1013-1017
The tensile creep behavior of two rare-earth dopant systems, lanthanum
- and yttrium-doped alumina, are compared and contrasted in order to b
etter understand the role of oversized, isovalent cation dopants in de
termining creep behavior. It was found that, despite some microstructu
ral differences, these systems displayed qualitatively a similar impro
vement in creep resistance, supporting the hypothesis that creep is st
rongly influenced by segregation. Differences in primary creep behavio
r and activation energy for steady-state creep were, however, observed
for these systems. Given these results, it is expected that creep beh
avior can be further optimized by adjusting the dopant level and by co
ntrolling the microstructure.