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Determination of residual stresses in coating by pseudo-grazing incidence X-Ray diffraction method

Jun Peng 
Abstract : A new Pseudo-Grazing Incident X-Ray Diffraction (Pseudo-GIXRD) method for experimental stress analysis, noticed sin2 *, was developed to analyze the residual stress (RS) gradient in coatings. This method takes into account the crystalline orientations, the geometry of measurement (the incidence angle, the tilt angles and the thickness of analyzed layer) in order to know the exact depth of penetration. By this method, we can not only evaluate the average level of the RS in coatings, but also determine the gradient and their distribution by varying the incident angles for various desired penetration depths. Uncertainties of measurement were then evaluated and the influence of the surface roughness was studied with some samples loaded by known mechanical traction. An analytical model was established for the correction of the roughness influence on RS determination. In addition, a machined sample of Nickel based alloy with strong RS gradient was studied by applying our sin2 * method to evaluate the sensitivity of this method. Two series of thin film (Cu on the substrate of Ni with a phase obtained by PVD and Tantalum on the substrate of Ti with two phases a and b obtained by CVD) were applied by the new method to study the distribution of RS in these near surface layers. The comparison of the results obtained with those by two other methods showed that this new Pseudo-GIXRD method is reliable and easy to be used to determine the level and the distribution of RS.
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Submitted on : Thursday, October 5, 2006 - 8:00:00 AM
Last modification on : Thursday, October 5, 2006 - 8:00:00 AM
Long-term archiving on: : Thursday, September 30, 2010 - 7:29:41 PM


  • HAL Id : pastel-00001946, version 1



Jun Peng. Determination of residual stresses in coating by pseudo-grazing incidence X-Ray diffraction method. Engineering Sciences [physics]. Arts et Métiers ParisTech, 2006. English. ⟨NNT : 2006ENAM0019⟩. ⟨pastel-00001946⟩



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