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Influence of Flat Cavity Formation on Stress vs. Strain and Strain-Rate Relations of Superplastic Deformation in 3Y-TZP
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SYSNO ASEP 0346945 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Influence of Flat Cavity Formation on Stress vs. Strain and Strain-Rate Relations of Superplastic Deformation in 3Y-TZP Author(s) Motohashi, Y. (JP)
Ryukhtin, Vasil (UJF-V) RID, ORCID, SAI
Sakuma, T. (JP)
Šaroun, Jan (UJF-V) RID, ORCID, SAISource Title Materials Transactions. - : Japan Institute of Metals and Materials - ISSN 1345-9678
Roč. 51, č. 3 (2010), s. 567-573Number of pages 7 s. Language eng - English Country JP - Japan Keywords superplasticity ; tetragonal zirconia polycrystals ; flow stress Subject RIV BG - Nuclear, Atomic and Molecular Physics, Colliders CEZ AV0Z10480505 - UJF-V (2005-2011) UT WOS 000276967200025 DOI 10.2320/matertrans.M2009381 Annotation During superplastic deformation (SPD) of tetragonal zirconia polycrystals containing 3 mol% yttria (3Y-TZP) at high strain-rates, a number of crack-like flat cavities having very narrow gaps lying along grain boundaries mostly normal to the tensile axis are produced in addition to conventional cavities. In order to see when (from which strain point) the flat cavities get started to form, the tensile deformation of the 3Y-TZP was interrupted at different strain points including a yield point, and then a small angle neutron scattering (SANS) technique was applied to examine the existence of the flat cavities. It was found that no flat cavities were produced at the yield point but they got started to form soon after the yielding, i.e., after a superplastic flow began. The formation of the flat cavities can decrease the cross-sectional area of the specimen, resulting in a decrease in the flow stress apparently. Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2011
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