Plastic deformation and allotropic phase transformations in zirconia ceramics during high-pressure torsion

Severe plastic deformation using high-pressure torsion (HPT) is successfully applied at room temperature to partially stabilized ZrO 2. X-ray diffraction and Raman spectroscopy analyses reveal that appreciable strain is introduced in the sample and a phase transformation with a coherent interface oc...

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Bibliographic Details
Published inScripta materialia Vol. 65; no. 11; pp. 974 - 977
Main Authors Edalati, Kaveh, Toh, Shoichi, Ikoma, Yoshifumi, Horita, Zenji
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.12.2011
Subjects
Ceramics
Dislocation density
High-pressure torsion
Nanocomposites
Nanomaterials
Nanostructure
Phase transformations
Plastic deformation
Severe plastic deformation (SPD)
Torsion
Zirconia
Zirconium dioxide
Zirconia
Ceramics
Phase transformations
Severe plastic deformation (SPD)
High-pressure torsion
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Summary:Severe plastic deformation using high-pressure torsion (HPT) is successfully applied at room temperature to partially stabilized ZrO 2. X-ray diffraction and Raman spectroscopy analyses reveal that appreciable strain is introduced in the sample and a phase transformation with a coherent interface occurs from the metastable tetragonal phase to the monoclinic phase during HPT. The fraction of the stress-induced monoclinic phase increases with straining, reaches a saturation level. Transmission electron microscopy shows that nanograins of high dislocation density but with no twins are formed during HPT.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2011.08.024