In:
Journal of the American Ceramic Society, Wiley, Vol. 70, No. 6 ( 1987-06), p. 431-440
Abstract:
Euctectoid decomposition of cubic ( c ) ZrO 2 in MgO‐partially‐stabilized ZrO 2 (Mg‐PSZ) has been studied using optical, scanning electron, and transmission electron microscopy. Alloys containing from 8.1 to 18.6 mol% MgO were decomposed by annealing between 1100° and 1300°C for times up to 16 h. The eutectoid products nucleated heterogeneously at the grain boundaries and advanced into the adjoining two‐phase grains. Decomposition proceeded as a “cellular” reaction involving the cooperative growth of MgO and a low‐solute ZrO 2 phase with either monoclinic ( m ) or tetragonal ( t ) symmetry. The MgO morphology is rodlike and exhibits a well‐defined orientation relationship to m ‐ZrO 2 . The rate of eutectoid decomposition was a maximum at 1200°C and was greater in the solute‐rich materials at all temperatures. At 1100°C, SrO doping decreased the nucleation rate of the eutectoid product in a 9.7 mol% alloy, thus strongly suppressing the decomposition rates; at the higher decomposition temperatures, the SrO was less effective.
Type of Medium:
Online Resource
ISSN:
0002-7820
,
1551-2916
DOI:
10.1111/jace.1987.70.issue-6
DOI:
10.1111/j.1151-2916.1987.tb05664.x
Language:
English
Publisher:
Wiley
Publication Date:
1987
detail.hit.zdb_id:
2008170-4
detail.hit.zdb_id:
219232-9
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