Microstructure and micro-mechanical properties of Y-TZP and Y-TZP/Al{sub 2}O{sub 3} composite after superplastic deformation

Journal Article · Mon Mar 23 04:00:00 EST 1998 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(97)00424-2· OSTI ID:616245

Shi, J L; Lu, Z L; Gao, J H; Zhu, G Q; Li, L; Lai, T R ^[1]

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1. Chinese Academy of Sciences, Shanghai (China). State Key Lab. of High Performance Ceramics and Superfine Microstructure

The microstructure and micro-mechanical properties of superplastically deformed Y-TZP ceramics and Y-TZP/Al{sub 2}O{sub 3} composites were investigated. The grain growth on average of the pure Y-TZP ceramics during deformation at the temperature 100 C below the sintering temperature was very limited, while extensive growth of Y-TZP grains in Y-TZP/alumina composites were found under the same condition. The segregation of Y{sup 3+} in single phase Y-TZP and the glass phase present at triple points in the composites was believed to be responsible for the different grain growth behavior. The change of mechanical properties of the materials were found to mainly relate to the microstructural change of the materials during deformation. In the case of single phase Y-TZP ceramics, both Vicker`s hardness and indentation toughness do not apparently change by deformation, but the indentation toughness of the Y-TZP/alumina composites decreased noticeably due to the extensive grain growth of Y-TZP and thereafter the occurrence of monoclinic zirconia phase.

• OSTI ID: 616245
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 6 Vol. 46; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
COMPOSITE MATERIALS
DEFORMATION
GRAIN GROWTH
MECHANICAL PROPERTIES
MICROSTRUCTURE
YTTRIUM OXIDES
ZIRCONIUM OXIDES