title: Temperature dependent mechanical property of PZT film: an investigation by nanoindentation.
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.
authors.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.
authors.forename: Yingwei
authors.initials: Y
authors.lastname: Li
authors.affiliation: Department of Engineering mechanics, School of Civil Engineering, Wuhan University, Wuhan, China.
authors.forename: Shangming
authors.initials: S
authors.lastname: Feng
authors.affiliation: Department of Engineering mechanics, School of Civil Engineering, Wuhan University, Wuhan, China.
authors.forename: Wenping
authors.initials: W
authors.lastname: Wu
authors.affiliation: State Key Lab for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing, China.
authors.forename: Faxin
authors.initials: F
authors.lastname: Li
mesh_terms: D055119:Elastic Modulus; D006245:Hardness Tests / Q000379:methods; D007854:Lead / Q000737:chemistry*; D008422:Materials Testing / Q000379:methods*; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D014025:Titanium / Q000737:chemistry*; D015040:Zirconium / Q000737:chemistry*
chemical_list: C065536:lead titanate zirconate; D007854:Lead; D015040:Zirconium; D014025:Titanium