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Temperature dependent mechanical property of PZT film: an investigation by nanoindentation.

Li Y, Feng S, Wu W, Li F - PLoS ONE (2015)

Bottom Line: Its reduce modulus and hardness were calculated by the typical Oliver-Pharr method.Results show that the indentation depth and modulus increase, but the hardness decreases at elevated temperature.The increasing of true modulus is attributed to the reducing of recoverable indentation depth induced by back-switched domains.

View Article: PubMed Central - PubMed

Affiliation: Department of Engineering mechanics, School of Civil Engineering, Wuhan University, Wuhan, China; State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, China.

ABSTRACT
Load-depth curves of an unpoled Lead Zirconate Titanate (PZT) film composite as a function of temperature were measured by nanoindentation technique. Its reduce modulus and hardness were calculated by the typical Oliver-Pharr method. Then the true modulus and hardness of the PZT film were assessed by decoupling the influence of substrate using methods proposed by Zhou et al. and Korsunsky et al., respectively. Results show that the indentation depth and modulus increase, but the hardness decreases at elevated temperature. The increasing of indentation depth and the decreasing of hardness are thought to be caused by the decreasing of the critical stress needed to excite dislocation initiation at high temperature. The increasing of true modulus is attributed to the reducing of recoverable indentation depth induced by back-switched domains. The influence of residual stress on the indentation behavior of PZT film composite was also investigated by measuring its load-depth curves with pre-load strains.

No MeSH data available.


Related in: MedlinePlus

The load-depth curves of the PZT film composite at different pre-load states.The inset figure shows the loading stage.
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pone.0116478.g008: The load-depth curves of the PZT film composite at different pre-load states.The inset figure shows the loading stage.

Mentions: We designed a simple steel (Q235) loading stage to apply pre-load stress to PZT film composite (Fig. 8). PZT film composite was pasted on its surface. Two strain gauges were glued on two opposite lateral surfaces of the loading part, and one strain gauge was pasted on the surface of the PZT film composite to monitor the applied strains and the portion of strains can be transferred from the loading stage to the PZT film. Two screw bolts were used to apply stress to the stage. During loading, it is found only 80% of the applied strains can be transferred from the loading stage to PZT film.


Temperature dependent mechanical property of PZT film: an investigation by nanoindentation.

Li Y, Feng S, Wu W, Li F - PLoS ONE (2015)

The load-depth curves of the PZT film composite at different pre-load states.The inset figure shows the loading stage.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4358891&req=5

pone.0116478.g008: The load-depth curves of the PZT film composite at different pre-load states.The inset figure shows the loading stage.
Mentions: We designed a simple steel (Q235) loading stage to apply pre-load stress to PZT film composite (Fig. 8). PZT film composite was pasted on its surface. Two strain gauges were glued on two opposite lateral surfaces of the loading part, and one strain gauge was pasted on the surface of the PZT film composite to monitor the applied strains and the portion of strains can be transferred from the loading stage to the PZT film. Two screw bolts were used to apply stress to the stage. During loading, it is found only 80% of the applied strains can be transferred from the loading stage to PZT film.

Bottom Line: Its reduce modulus and hardness were calculated by the typical Oliver-Pharr method.Results show that the indentation depth and modulus increase, but the hardness decreases at elevated temperature.The increasing of true modulus is attributed to the reducing of recoverable indentation depth induced by back-switched domains.

View Article: PubMed Central - PubMed

Affiliation: Department of Engineering mechanics, School of Civil Engineering, Wuhan University, Wuhan, China; State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, China.

ABSTRACT
Load-depth curves of an unpoled Lead Zirconate Titanate (PZT) film composite as a function of temperature were measured by nanoindentation technique. Its reduce modulus and hardness were calculated by the typical Oliver-Pharr method. Then the true modulus and hardness of the PZT film were assessed by decoupling the influence of substrate using methods proposed by Zhou et al. and Korsunsky et al., respectively. Results show that the indentation depth and modulus increase, but the hardness decreases at elevated temperature. The increasing of indentation depth and the decreasing of hardness are thought to be caused by the decreasing of the critical stress needed to excite dislocation initiation at high temperature. The increasing of true modulus is attributed to the reducing of recoverable indentation depth induced by back-switched domains. The influence of residual stress on the indentation behavior of PZT film composite was also investigated by measuring its load-depth curves with pre-load strains.

No MeSH data available.


Related in: MedlinePlus