Effect of stiff substrates on enhancing the fracture resistance of Barium Titanate thin films

Nidhin George Mathews; Aloshious Lambai; Gaurav Mohanty; N. Venkataramani; Gerhard Dehm; Balila Nagamani Jaya

doi:10.1016/j.matdes.2023.112440

Effect of stiff substrates on enhancing the fracture resistance of Barium Titanate thin films

Nidhin George Mathews^*
, Aloshious Lambai
, Gaurav Mohanty
, N. Venkataramani
, Gerhard Dehm
, Balila Nagamani Jaya^*

^*Corresponding author for this work

Not published at VTT

Tampere University
Indian Institute of Technology Bombay
Max-Planck-Institute for Sustainable Materials

Research output: Contribution to journal › Article › Scientific › peer-review

6 Citations (Scopus)

Abstract

Damage tolerance of a thin film attached to a substrate is dependent on several parameters such as film thickness, film orientation, residual stresses, nature of interfaces, microstructure and defects present. Here we study the fracture resistance and crack growth trajectory in BaTiO3 thin films attached to elasticially stiff substrates using micromechanical experiments and finite element modeling. Microcantilever fracture tests are carried out on bi-layered systems of BaTiO3 film on Pt-Si and SrTiO3 substrates to study the effect of interfaces, texture and elastic mismatch on fracture toughness. The substrates in the bi-layers are chosen to force the crack to experience a shielding effect in terms of a decrease in the crack driving force. Experiments revealed an unexpectedly large increase in fracture toughness when the crack tip is closer to a stiffer substrate, qualitatively matching the predictions from the numerical model. The bi-layered films attached to the substrate showed 125% (on Pt-Si) and 160% (on SrTiO3) increase in fracture toughness compared to the free-standing films, for the first time, revealing the significant effect of elastic modulus of the substrate on improving the fracture resistance at such micrometer length scales.

Original language	English
Article number	112440
Journal	Materials and Design
Volume	235
DOIs	https://doi.org/10.1016/j.matdes.2023.112440
Publication status	Published - 7 Nov 2023
MoE publication type	A1 Journal article-refereed

Funding

The authors are grateful to the Max-Planck Society Partner Group Project (No.17MAX001) for providing financial support. G.M, A.L and N.G.M acknowledge the use of funding from Academy of Finland grants (315451 and 341050) for this work. This work made use of Tampere Microscopy Center facilities at Tampere University. The authors also acknowledge the use of central and departmental facilities (PLD, nanoindenter, XRD, and dual beam FIB-SEM) at IIT Bombay for the experimental support. The authors are thankful to Dr. Dheepa Srinivasan and Dr. Anup Kulkarni (Pratt & Whitney Research and Development Center, IISc Bangalore) for their help in TEM measurements.

Keywords

Thin films
Fracture
Bi-layer
Crack propagation
Fracture toughness
Barium Titanate

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10.1016/j.matdes.2023.112440Licence: CC BY

Cite this

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title = "Effect of stiff substrates on enhancing the fracture resistance of Barium Titanate thin films",

abstract = "Damage tolerance of a thin film attached to a substrate is dependent on several parameters such as film thickness, film orientation, residual stresses, nature of interfaces, microstructure and defects present. Here we study the fracture resistance and crack growth trajectory in BaTiO3 thin films attached to elasticially stiff substrates using micromechanical experiments and finite element modeling. Microcantilever fracture tests are carried out on bi-layered systems of BaTiO3 film on Pt-Si and SrTiO3 substrates to study the effect of interfaces, texture and elastic mismatch on fracture toughness. The substrates in the bi-layers are chosen to force the crack to experience a shielding effect in terms of a decrease in the crack driving force. Experiments revealed an unexpectedly large increase in fracture toughness when the crack tip is closer to a stiffer substrate, qualitatively matching the predictions from the numerical model. The bi-layered films attached to the substrate showed 125\% (on Pt-Si) and 160\% (on SrTiO3) increase in fracture toughness compared to the free-standing films, for the first time, revealing the significant effect of elastic modulus of the substrate on improving the fracture resistance at such micrometer length scales.",

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AU - Lambai, Aloshious

AU - Mohanty, Gaurav

AU - Venkataramani, N.

AU - Dehm, Gerhard

AU - Jaya, Balila Nagamani

PY - 2023/11/7

Y1 - 2023/11/7

N2 - Damage tolerance of a thin film attached to a substrate is dependent on several parameters such as film thickness, film orientation, residual stresses, nature of interfaces, microstructure and defects present. Here we study the fracture resistance and crack growth trajectory in BaTiO3 thin films attached to elasticially stiff substrates using micromechanical experiments and finite element modeling. Microcantilever fracture tests are carried out on bi-layered systems of BaTiO3 film on Pt-Si and SrTiO3 substrates to study the effect of interfaces, texture and elastic mismatch on fracture toughness. The substrates in the bi-layers are chosen to force the crack to experience a shielding effect in terms of a decrease in the crack driving force. Experiments revealed an unexpectedly large increase in fracture toughness when the crack tip is closer to a stiffer substrate, qualitatively matching the predictions from the numerical model. The bi-layered films attached to the substrate showed 125% (on Pt-Si) and 160% (on SrTiO3) increase in fracture toughness compared to the free-standing films, for the first time, revealing the significant effect of elastic modulus of the substrate on improving the fracture resistance at such micrometer length scales.

AB - Damage tolerance of a thin film attached to a substrate is dependent on several parameters such as film thickness, film orientation, residual stresses, nature of interfaces, microstructure and defects present. Here we study the fracture resistance and crack growth trajectory in BaTiO3 thin films attached to elasticially stiff substrates using micromechanical experiments and finite element modeling. Microcantilever fracture tests are carried out on bi-layered systems of BaTiO3 film on Pt-Si and SrTiO3 substrates to study the effect of interfaces, texture and elastic mismatch on fracture toughness. The substrates in the bi-layers are chosen to force the crack to experience a shielding effect in terms of a decrease in the crack driving force. Experiments revealed an unexpectedly large increase in fracture toughness when the crack tip is closer to a stiffer substrate, qualitatively matching the predictions from the numerical model. The bi-layered films attached to the substrate showed 125% (on Pt-Si) and 160% (on SrTiO3) increase in fracture toughness compared to the free-standing films, for the first time, revealing the significant effect of elastic modulus of the substrate on improving the fracture resistance at such micrometer length scales.

KW - Thin films

KW - Fracture

KW - Bi-layer

KW - Crack propagation

KW - Fracture toughness

KW - Barium Titanate

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VL - 235

JO - Materials and Design

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M1 - 112440

ER -

Effect of stiff substrates on enhancing the fracture resistance of Barium Titanate thin films

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Keywords

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