Ryukhtin V. ; Saroun J. ; Harjo S. ; Motohashi Y. ; Wiedenmann A. ; Strunz P.:
SANS investigations of pore anisotropy in superplastically deformed ceramics. Physica B 350 (2004), p. e1019-e1022
Abstract:
Superplastically deformed samples of 3mol% yttria stabilized tetragonal zirconia polycrystals (3Y-TZP) and 3YTZP
with 20wt% of Al2O3 were studied by SANS with the aim to compare cavitation behaviours under different
deformation conditions. Though the average size of cavities formed during deformation is so large that they can be
measured only by high-resolution SANS techniques, conventional SANS method permitted us to measure their specific
surface and aspect ratio quite effectively. Analysis of the two-dimentional SANS data clearly showed two qualitatively
different cavitation regimes corresponding to the low-stress (low-strain rate and high-temperature) and high-stress
conditions, respectively. In the latter case, a new type of flat pores transversal to the tension axis was observed, in
addition to the usually present slightly prolate cavities.
r 2004 Elsevier B.V. All rights reserved.
PACS: 68.55; 61.45
Keywords: Small-angle neutron scattering; Tetragonal zirconia polycrystals;
