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Size effect of mechanical behavior for lead-free nanofibers by nanoindentation

机译:纳米压痕对无铅纳米纤维力学行为的尺寸影响

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摘要

The nanoscale mechanical behaviors of (Na_(0.82)K_(0.18)_(0.5)Bi_(0.5)TiO_3 (NKBT) piezoelectric nanofibers and thin film were investigated by nanoindentation technique in detail. In comparison with the reduced modulus (158.2 GPa) and hardness (7.3 GPa) of NKBT thin film, the reduced modulus and hardness are 107.6GPa and 4.9 GPa for the nanofibers, and they decrease by 31.9% and 32.8%. The size effect of the mechanical behavior was obviously observed for the nanofibers, and the mechanism is discussed in conjunction with high surface-to-volume ratio. Indentation depth-dependent reduced modulus and hardness properties were also observed for the nanofibers, and they may be attributed to the strain gradient effect during nanoindentation.
机译:用纳米压痕技术详细研究了(Na_(0.82)K_(0.18)_(0.5)Bi_(0.5)TiO_3(NKBT)压电纳米纤维和薄膜的纳米力学行为,并与降低模量(158.2 GPa)和NKBT薄膜的硬度为(7.3 GPa),纳米纤维的模量和硬度降低了107.6GPa和4.9 GPa,分别降低了31.9%和32.8%,纳米纤维的力学行为的尺寸效应明显,并且结合高表面体积比讨论了该机理,还观察到了纳米纤维的压痕深度依赖性降低的模量和硬度性质,这可能归因于纳米压痕过程中的应变梯度效应。

著录项

  • 来源
    《Materials Science and Engineering》 |2010年第22期|P.5462-5466|共5页
  • 作者

    Y.Q Chen; X.J. Zheng; W. Li;

  • 作者单位

    Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education, and Faculty of Materials, Optoelectronics and Physics, Xiangtan University, Xiangtan, Hunan, China;

    Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education, and Faculty of Materials, Optoelectronics and Physics, Xiangtan University, Xiangtan, Hunan, China;

    Dept. of Mechanical Engineering, University of Alberta, Edmonton, AB T6C 2C8, Canada;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    nanoindentation; nanostructured materials; sintering; dislocations;

    机译:纳米压痕纳米结构材料;烧结;脱位;

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