Evolution of Microstructure in Yttria Partially-Stabilized Zirconia

Sakuma, Taketo

doi:10.1007/978-94-009-1373-8_193

Cited by 1 publication

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“…There is a number of examples of spinodal decomposition inside metastable binodal in glass systems (109). Second, the author has pointed out that the spinodal-like phase separation may occur in ZrO2-Y2O3, provided that the lattice parameter change occurs continuously from c-ZrO2, to t-ZrO2 (110). Figure 17 shows a plot of the lattice parameter of t-ZrO2 and c-ZrO2 as a function of Y2O3 content(191) (111).…”

Section: Transformationmentioning

confidence: 99%

Phase Transformation and Microstructure of Partially-Stabilized Zirconia

Sakuma

1988

Trans. JIM

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Phase transformations and the resultant microstructures of partially-stabilized zirconia (PSZ) are briefly reviewed with a special interest in the nature of phase transformations. The martensitic tetragonal-to-monoclinic transformation, which plays a principal role in toughening of PSZ, accompanies lattice defects such as twins or dislocations in the product phase m-ZrO2. The diffusionless cubicto-tetragonal (c-t) transformation is characterized by two different microstructures; one with the domain structure whose boundaries have curvilinear features showing the contrast of anti-phase domain boundaries in ordered alloys, and the other with thin-plates or 1enticular features. It seems that the diffusionless c-t transformation is always completed by an initial development of domain structure over the entire region of samples. The thin plates or lenticular features may be subsequently formed by the strain accommodation. The nature of the diffusionless c-t transformation is the second order phase transition. The precipitation of t-ZrO2 in the c-ZrO2 matrix is commonly found in alloys heat-treated in the cubic/tetragonal two-phase region. Together with the usual precipitation structures, the modulated or tweed structure is also formed at an early stage of aging. The origin of these microstructures, and the nature of the diffusional reaction or precipitation is discussed in this paper.

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Section: Transformationmentioning

confidence: 99%