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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

True modulus of the PZT film composite vs. maximum indentation depth curves at different temperature (a), and hardness vs. contact depth curves of the PZT film composite at different temperature.The black dots represent the experimental results (b). The red lines in Fig. 7A and Fig. 7B represent the fitting results by equation 6 and equation 9, respectively.
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pone.0116478.g007: True modulus of the PZT film composite vs. maximum indentation depth curves at different temperature (a), and hardness vs. contact depth curves of the PZT film composite at different temperature.The black dots represent the experimental results (b). The red lines in Fig. 7A and Fig. 7B represent the fitting results by equation 6 and equation 9, respectively.

Mentions: Then by fitting equation 6 with the experimental results, the true modulus of the PZT film and the substrate can be assessed. It should be noted that when the maximum indentation depth is less one third of the radius modulus of the indenter tip, the measured modulus and hardness is typically not valid [13]. Therefore, only the data with the maximum indentation depth larger than 40nm was used during fitting. Fig. 7A shows the fitting results.


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

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

True modulus of the PZT film composite vs. maximum indentation depth curves at different temperature (a), and hardness vs. contact depth curves of the PZT film composite at different temperature.The black dots represent the experimental results (b). The red lines in Fig. 7A and Fig. 7B represent the fitting results by equation 6 and equation 9, respectively.
© Copyright Policy
Related In: Results  -  Collection

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

pone.0116478.g007: True modulus of the PZT film composite vs. maximum indentation depth curves at different temperature (a), and hardness vs. contact depth curves of the PZT film composite at different temperature.The black dots represent the experimental results (b). The red lines in Fig. 7A and Fig. 7B represent the fitting results by equation 6 and equation 9, respectively.
Mentions: Then by fitting equation 6 with the experimental results, the true modulus of the PZT film and the substrate can be assessed. It should be noted that when the maximum indentation depth is less one third of the radius modulus of the indenter tip, the measured modulus and hardness is typically not valid [13]. Therefore, only the data with the maximum indentation depth larger than 40nm was used during fitting. Fig. 7A shows the fitting results.

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