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

SCRIPTA MATERIALIA

卷:65

Article

Edalati, Kaveh^1,2  Toh, Shoichi³  Ikoma, Yoshifumi¹  Horita, Zenji^1,2 

[1] Kyushu Univ, Fac Engn, Dept Mat Sci & Engn, Fukuoka 8190395, Japan

[2] Kyushu Univ, WPI, Int Inst Carbon Neutral Energy Res I2CNER, Fukuoka 8190395, Japan

[3] Kyushu Univ, Res Lab High Voltage Electron Microscopy, Fukuoka 8190395, Japan

关键词: Zirconia;    High-pressure torsion;    Severe plastic deformation (SPD);    Ceramics;    Phase transformations;   

DOI  :  10.1016/j.scriptamat.2011.08.024

来源: Elsevier

【 摘 要 】

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. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free