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Cyclic testing of thin Ni films on a pre-tensile compliant substrate

机译：预拉伸顺应性基板上镍薄膜的循环测试

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摘要

A novel experimental approach to study the cyclic plastic deformation of thin metallic films is presented. 300 nm thick Ni films are deposited on both sides of a pre-tensile soft substrate which allows to deform the films alternately in tension and compression (approximately from +2.7 GPa down to -2GPa) relative to the as-deposited residual stress state. Nanocrystalline thin films' intrinsic elastic strains (or stresses) and true strains have been measured step by step during two loading/unloading cycles thanks to the X-ray diffraction (XRD) and digital image correlation (DIC) techniques respectively. From the first cyclic deformation, a significant Bauschinger effect is evidenced in the films, however, little or no cyclic hardening is observed during the two cyclic tests.
机译：提出了一种新颖的实验方法来研究金属薄膜的循环塑性变形。将300 nm厚的Ni膜沉积在预拉伸的软质基材的两侧，相对于沉积后的残余应力状态，该膜可以使膜在拉伸和压缩状态下交替变形（从+2.7 GPa降低到-2GPa）。分别借助X射线衍射（XRD）和数字图像相关（DIC）技术，已在两个加载/卸载循环中逐步测量了纳米晶体薄膜的固有弹性应变（或应力）和真实应变。从第一次循环变形开始，在薄膜中发现了明显的鲍辛格效应，但是，在两次循环测试中几乎没有观察到循环硬化。

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  • 来源
    《Materials Science and Engineering》 |2017年第may17期|112-119|共8页
  • 作者

    He Wei; Pierre-Olivier Renault; Eric Le Bourhis; Shibin Wang; Philippe Goudeau;

  • 作者单位

    Department of Mechanics, Tianjin University, 135 Yaguan Rd, Jinnan, 300350 Tianjin, China ,Département Physique et Mécanique d es Matériaux, Institut Pprime, CNRS-Université de Poitiers, Bd Marie et Pierre Curie, Futuroscope, 86962, France;

    Département Physique et Mécanique d es Matériaux, Institut Pprime, CNRS-Université de Poitiers, Bd Marie et Pierre Curie, Futuroscope, 86962, France;

    Département Physique et Mécanique d es Matériaux, Institut Pprime, CNRS-Université de Poitiers, Bd Marie et Pierre Curie, Futuroscope, 86962, France;

    Department of Mechanics, Tianjin University, 135 Yaguan Rd, Jinnan, 300350 Tianjin, China;

    Département Physique et Mécanique d es Matériaux, Institut Pprime, CNRS-Université de Poitiers, Bd Marie et Pierre Curie, Futuroscope, 86962, France;

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  • 正文语种 eng
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  • 关键词

    Thin films; Pre-stretching; Plastic deformation; Bauschinger effect;

    机译：薄膜;预拉伸;塑性变形;包辛格效应;

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