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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 curve of PZT film composite under partial unloading function at 24°C.
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pone.0116478.g004: The load-depth curve of PZT film composite under partial unloading function at 24°C.

Mentions: The modulus and hardness of the PZT film composite as a function of loading amplitude and temperature were then measured throughout standard partial unloading method (The inset figure in Fig. 3 illustrates the loading function). Fig. 4 shows the represented load-depth curve of the PZT film composite at 24°C. The reduce modulus and hardness were then calculated by the typical Oliver-Pharr method [13]. The reduced modulus was calculated by equation:Er=Sπ2A(1)


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 curve of PZT film composite under partial unloading function at 24°C.
© Copyright Policy
Related In: Results  -  Collection

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

pone.0116478.g004: The load-depth curve of PZT film composite under partial unloading function at 24°C.
Mentions: The modulus and hardness of the PZT film composite as a function of loading amplitude and temperature were then measured throughout standard partial unloading method (The inset figure in Fig. 3 illustrates the loading function). Fig. 4 shows the represented load-depth curve of the PZT film composite at 24°C. The reduce modulus and hardness were then calculated by the typical Oliver-Pharr method [13]. The reduced modulus was calculated by equation:Er=Sπ2A(1)

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