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

被引：15

作者：

Voegler, M. ^{[1
]}

Daniels, J. E. ^{[2
]}

Webber, K. G. ^{[3
]}

Roedel, J. ^{[1
]}

机构：

[1] Tech Univ Darmstadt, Inst Mat Sci, D-64287 Darmstadt, Germany

[2] UNSW Australia, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia

[3] Friedrich Alexander Univ Erlangen Nurnberg, Dept Mat Sci, D-91054 Erlangen, Germany

来源：

SCRIPTA MATERIALIA | 2017年 / 136卷

基金：

澳大利亚研究理事会;

关键词：

Relaxor; Fracture toughness; Lead-free; NBT-BT; Ferroelectric; R-CURVE BEHAVIOR; X-RAY-DIFFRACTION; ELECTRICAL-PROPERTIES; FRACTURE-TOUGHNESS; DIELECTRIC-PROPERTIES; TEMPERATURE; TITANATE; PIEZOCERAMICS; INDENTATION; BATIO3;

D O I：

10.1016/j.scriptamat.2017.04.023

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The fracture behavior of the unpoled 0.94(Na1/2Bi1/2)TiO3-0.06BaTiO(3) relaxor ferroelectric was 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. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：115 / 119

页数：5

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