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Indentation Contact Deformation of 3Y-TZP at Elevated Temperatures
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Indentation Contact Deformation of 3Y-TZP at Elevated Temperatures

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Abstract:

The contact deformation mechanisms of a superplastic ceramic, 3Y-TZP (3mol % yttria-partially stabilized tetragonal zirconia polycrystals) are examined in indentation creep tests at high temperatures. A large discrepancy between the uniaxial compression and the pyramidal indentation contact behaviors is observed. The indentation creep curves exhibit a hardening behavior, i.e., the penetration rate decreases as the penetration depth and/or the creep time increases. This fact implied that the cooperative grain-boundary sliding (CGBS) in a microscopically localized region, such as the sub-surface contact region beneath a pyramidal indenter, is very limited through the microscopic processes of localized grain interlocking.

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Periodical:

Key Engineering Materials (Volumes 317-318)

Pages:

469-472

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.317-318.469

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Online since:

August 2006

Authors:

Hiroyuki Muto, R. Yamada, Atsunori Matsuda, Mototsugu Sakai

Keywords:

Grain Boundary Sliding (GBS), Indentation, Superplastic Deformation

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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