Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/23111
Title: The grain size dependency of compressive deformation of a superplastic 3 mol% yttria stabilized tetragonal zirconia
Authors: Tong, GQ
Chan, KC 
Gao, L
Lin, ZR
Keywords: Activation energy
Amorphous phase
Concurrent grain growth
Grain boundary sliding
Issue Date: 2002
Publisher: Elsevier Science Sa
Source: Materials science and engineering a, 2002, v. 336, no. 1-2, p. 263-269 How to cite?
Journal: Materials Science and Engineering A 
Abstract: The compressive behavior of a medium purity 3 mo1% yttria stabilized tetragonal zirconia (3YTZ) was investigated with three different initial grain sizes at the temperature of 1723 K. It was found that the strain rate sensitivity exponent increases from 0.45 to 0.55 when the initial grain size increases from 0.5 to 1.1 μm and that the grain size exponent is about 2.0. Microstructural measurements revealed that grains retained the essentially equiaxed nature even after large plastic strain and that the instantaneous grain size had a linear relationship with true strain at the specified initial strain rates. Transmission electron microscope observation demonstrated that an amorphous phase concentrated at multiple points and that no amorphous phase formed at two-grain boundaries. Like Al 2O 3, the SiO 2 content had a significant effect on superplastic 3YTZ characteristics. It is considered that grain boundary sliding (GBS) should play a dominant role in 3YTZ superplasticity and that the presence of an amorphous phase at triple or multiple points could effectively release the stress concentration caused by GBS and thereby facilitate superplastic deformation.
URI: http://hdl.handle.net/10397/23111
ISSN: 0921-5093
DOI: 10.1016/S0921-5093(01)01985-2
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

8
Citations as of Jan 14, 2017

WEB OF SCIENCETM
Citations

9
Last Week
0
Last month
0
Citations as of Jan 15, 2017

Page view(s)

18
Last Week
0
Last month
Checked on Jan 15, 2017

Google ScholarTM

Check

Altmetric



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.