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Absence of toughening behavior in 0.94(Na1/2Bi1/2)TiO3-0.06BaTiO3 relaxor ceramic

Vögler, Malte and Daniels, John E. and Webber, Kyle G. and Rödel, Jürgen (2017):
Absence of toughening behavior in 0.94(Na1/2Bi1/2)TiO3-0.06BaTiO3 relaxor ceramic.
In: Scripta Materialia, Elsevier, pp. 115-119, (136), ISSN 13596462, [Online-Edition: http://dx.doi.org/10.1016/j.scriptamat.2017.04.023],
[Article]

Abstract

The fracture behavior of the unpoled 0.94(Na1/2Bi1/2)TiO3-0.06BaTiO3 relaxor ferroelectricwas investigated. Previous studies indicated that a metastable ferroelectric long-range order can be induced by mechanical stresses,which could lead to a crack tip process zone and increasing crack resistance during crack growth. Crack propagation in compact tension samples yielded a constant crack resistance as function of crack length. This is consistent with ex situ x-ray diffraction experiments,where a remanent induced process zone on the fracture surface could not be detected. We suggest the very high transformation stress, determined via macroscopic stress-strain measurements,is responsible for the absence of toughening. © 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Item Type: Article
Erschienen: 2017
Creators: Vögler, Malte and Daniels, John E. and Webber, Kyle G. and Rödel, Jürgen
Title: Absence of toughening behavior in 0.94(Na1/2Bi1/2)TiO3-0.06BaTiO3 relaxor ceramic
Language: English
Abstract:

The fracture behavior of the unpoled 0.94(Na1/2Bi1/2)TiO3-0.06BaTiO3 relaxor ferroelectricwas investigated. Previous studies indicated that a metastable ferroelectric long-range order can be induced by mechanical stresses,which could lead to a crack tip process zone and increasing crack resistance during crack growth. Crack propagation in compact tension samples yielded a constant crack resistance as function of crack length. This is consistent with ex situ x-ray diffraction experiments,where a remanent induced process zone on the fracture surface could not be detected. We suggest the very high transformation stress, determined via macroscopic stress-strain measurements,is responsible for the absence of toughening. © 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Journal or Publication Title: Scripta Materialia
Number: 136
Publisher: Elsevier
Uncontrolled Keywords: Relaxor Fracture toughness Lead-free NBT-BT Ferroelectric
Divisions: 11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences
Date Deposited: 02 May 2017 07:31
Official URL: http://dx.doi.org/10.1016/j.scriptamat.2017.04.023
Identification Number: DOI: 10.1016
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