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Nondestructive evaluation of residual stresses in nanostructured coatings by synchrotron radiation.

机译:通过同步加速器辐射对纳米结构涂层中的残余应力进行无损评估。

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摘要

This thesis presents a strain mapping in nanostructure Al 2O3/TiO2 ceramic coatings on metallic Titanium substrates by synchrotron radiation. The mapping is obtained under various boundary conditions (tension/compression loads, four-point bending, etc.) and is accomplished using high energy (deeply penetrating) synchrotron white radiation with photon energies up to 200 keV to perform high precision x-ray diffraction on small volumes (1 m to a few cm), which are then integrated into high resolution 3D maps of the strain fields. Strain mapping in conventional micro-size ceramic coatings are performed for comparison. The underlining structural and functional parameters in processing of these coatings, which result in dramatic improvements in their performance, are discussed. The thesis also presents mechanical properties such as elastic modulus, yield strength, etc., which are deduced from energy dispersive X-ray diffraction (EDXRD) strain mapping in conjunction with modeling.
机译:本文提出了通过同步加速器辐射在金属钛基体上的纳米结构Al 2O3 / TiO2陶瓷涂层的应变映射。该映射是在各种边界条件(拉伸/压缩载荷,四点弯曲等)下获得的,并且使用具有高达200 keV的光子能量的高能量(深穿透)同步加速器白辐射来完成,以执行高精度X射线衍射在小体积(1 m至几厘米)上,然后将其整合到应变场的高分辨率3D地图中。在常规的微尺寸陶瓷涂层中进行应变映射以进行比较。讨论了在这些涂层的加工过程中强调的结构和功能参数,这些参数导致了其性能的显着改善。论文还提出了力学性能,如弹性模量,屈服强度等,这是通过能量色散X射线衍射(EDXRD)应变映射结合建模得出的。

著录项

  • 作者

    Ahmedi, Nazia Ikram.;

  • 作者单位

    Rutgers The State University of New Jersey - New Brunswick.;

  • 授予单位 Rutgers The State University of New Jersey - New Brunswick.;
  • 学科 Engineering Mechanical.
  • 学位 M.S.
  • 年度 2010
  • 页码 59 p.
  • 总页数 59
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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