PZT陶瓷本构行为与断裂性能的相关性研究

doi:10.15541/jim20220638

无机材料学报 ›› 2023, Vol. 38 ›› Issue (7): 839-844.DOI: 10.15541/jim20220638 CSTR: 32189.14.10.15541/jim20220638

所属专题：【信息功能】介电、铁电、压电材料（202409）

• 研究快报 • 上一篇

PZT陶瓷本构行为与断裂性能的相关性研究

王雪瑶¹(), 王武港², 李应卫¹(), 彭奇¹, 梁瑞虹²()

1.武汉大学土木建筑工程学院, 武汉 430072
2.中国科学院上海硅酸盐研究所, 上海 200050

收稿日期:2022-10-31 修回日期:2022-12-23 出版日期:2023-03-09 网络出版日期:2023-03-09
通讯作者: 李应卫, 副教授. E-mail: yingweili@whu.edu.cn;
梁瑞虹, 研究员. E-mail: liangruihong@mail.sic.ac.c
作者简介:王雪瑶(1996-), 女, 博士研究生. E-mail: 2014301890049@whu.edu.cn

Correlation between Constitutive Behavior and Fracture Performance of PZT Ceramics

WANG Xueyao¹(), WANG Wugang², LI Yingwei¹(), PENG Qi¹, LIANG Ruihong²()

1. School of Civil Engineering, Wuhan University, Wuhan 430072, China
2. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

Received:2022-10-31 Revised:2022-12-23 Published:2023-03-09 Online:2023-03-09
Contact: LI Yingwei, associate professor. E-mail: yingweili@whu.edu.cn;
LIANG Ruihong, professor. E-mail: liangruihong@mail.sic.ac.cn
About author:WANG Xueyao (1996-), female, PhD candidate. E-mail: 2014301890049@whu.edu.cn
Supported by:
National Natural Science Foundation of China(11972262);Guangdong Provincial Key Laboratory Program(2021B1212040001)

摘要/Abstract

摘要：

铁电陶瓷的力学性能直接决定了其加工性能和铁电器件的可靠性。目前, 无论是实验还是理论报道的压电陶瓷材料的断裂韧性都与30年前的报道接近, 限制了压电器件在高可靠性要求的情况下的应用。本研究试图揭示可用于优化铁电陶瓷断裂性能的参数。利用单轴压缩方法、裂纹尖端张开位移(Crack-tip opening displacement, COD)技术和单边V型缺口梁(Single-side V-notch beam, SEVNB)技术分别测定三种典型PZT陶瓷的应力-应变曲线、本征断裂韧性和长裂纹断裂韧性。结果表明, 本征断裂韧性与材料的杨氏模量正相关, 说明提高铁电体的杨氏模量是提高其本征韧性的有效途径。长裂纹断裂韧性与本征韧性和非本征铁弹性畴变/相变增韧有关, 说明优化铁电陶瓷的铁弹翻转行为可以改善其非本征效应。软掺杂PZT相较于硬掺杂PZT具有较低的矫顽应力和较高的残余应变, 呈现较强的铁弹性翻转和较高的屏蔽韧性; 在不同PZT材料中观察到的断裂模式也被认为与材料不同的铁弹性翻转行为有关, 软PZT陶瓷呈现沿晶断裂, 铁弹性翻转较弱的硬PZT呈现穿晶断裂。综上所述, 优化铁电材料的杨氏模量和铁弹翻转行为有望提升其断裂韧性。

关键词: 锆钛酸铅, 裂纹尖端断裂韧性, 铁弹性畴翻转, 单边V型缺口梁

Abstract:

The fracture properties of ferroelectrics directly determine their processability and reliability of devices made of them. However, both experimentally and theoretically reported fracture toughness of piezoelectric ceramic materials remains nearly the same as that reported 30 years ago, limiting the application of piezoelectric devices in situation where high reliability is required. Here, we try to reveal the parameters that could be used to optimize the fracture performance of ferroelectrics. Specifically, stress-strain curves, intrinsic fracture toughness and long-crack fracture toughness of three typical PZT ceramics were measured by uniaxial compression method, crack-tip opening displacement (COD) technique and single-side V-notch beam (SEVNB) technique, respectively. It is shown that the intrinsic fracture toughness is positively correlated with the Young’s modulus of the material, which suggests that improving the Young’s modulus of ferroelectrics is an effective way to improve their intrinsic fracture toughness. The long-crack fracture toughness is related to the intrinsic toughness and extrinsic ferroelastic domain switching/phase transformation toughening, which also suggests that optimizing the ferroelastic switching behavior of piezoelectric ceramics can improve their extrinsic effect. Compared to the hard doped PZT, the soft doped PZT has low coercive stress, high remanent strain and high shielding toughness. The fracture patterns observed in different PZT materials are related to the different ferroelastic switching behavior of the materials. Soft PZT ceramics exhibit intergranular fracture, while hard PZT with weak ferroelastic switching behavior exhibits transgranular fracture. In conclusion, fracture toughness of ferroelectrics is enhanced by optimizing Young’s modulus and toughening of ferroelastic switching.

Key words: lead titanate zirconate, crack-tip fracture toughness, ferroelastic domain switching, single-edge V-notch beam

中图分类号:

TQ174

王雪瑶, 王武港, 李应卫, 彭奇, 梁瑞虹. PZT陶瓷本构行为与断裂性能的相关性研究[J]. 无机材料学报, 2023, 38(7): 839-844.

WANG Xueyao, WANG Wugang, LI Yingwei, PENG Qi, LIANG Ruihong. Correlation between Constitutive Behavior and Fracture Performance of PZT Ceramics[J]. Journal of Inorganic Materials, 2023, 38(7): 839-844.

图/表 10

Fig. 1 Optical microscope image of a V-notch

Fig. 2 Measured COD plotted versus the calculated COD (a) PZT-4; (b) PZT-5; (c) PZT-8

Fig. 3 Stress-strain curves of PZT obtained during mechanical compression (a) PZT-4; (b) PZT-5; (c) PZT-8

Fig. 4 Fracture toughness ${{K}_{Ivnb}}$ and intrinsic fracture toughness ${{K}_{I0}}$ for PZT-4, -5, and -8

Fig. 5 Illustration of the toughening mechanism (a) PZT-4 and PZT-5; (b) PZT-8

Table S1 Microstructural properties of the investigated materials

Material	Density /(g·cm^-3)	Grain size/μm
PZT-4	7.7	(2.5±0.5)
PZT-5	7.8	(5.0±0.5)
PZT-8	7.6	(2.5±0.5)

Fig. S1 COD profiles for (a) PZT-4, (b) PZT-5, and (c) PZT-8 The Irwin parabola is represented by the red line

Table S2 Determined values of ${{\sigma }_{c}}$, ${{\varepsilon }_{r}}$, ${{E}_{\mathbf{initial}}}$, ${{E}_{\mathbf{unloading}}}$, ${{\nu }_{\mathbf{initial}}}$, and ${{\nu }_{\mathbf{unloading}}}$

Material	${{\sigma }_{c}}$/MPa	${{\varepsilon }_{r}}$/%	${{E}_{\text{initial}}}$/ GPa	${{E}_{\text{unloading}}}$/ GPa	${{\nu }_{\text{initial}}}$	${{\nu }_{\text{unloading}}}$
PZT-4	120	0.18	73	154	0.4	0.35
PZT-5	55	0.32	53	131	0.33	0.33
PZT-8	170	0	58	114	0.12	0.27

Fig. S2 SEM images of (a) PZT-4, (b) PZT-5 and (c) PZT-8

Fig. S3 Crack propagates along a grain boundary (a)With direction parallel to the main crack; (b) With an angle of θ to the main crack

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PZT陶瓷本构行为与断裂性能的相关性研究

Correlation between Constitutive Behavior and Fracture Performance of PZT Ceramics

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