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Residual stress measurement in textured thin film by grazing-incidence X-ray diffraction
- Source :
-
Thin Solid Films . Oct2002, Vol. 418 Issue 2, p73. 6p. - Publication Year :
- 2002
-
Abstract
- Measurements of residual stresses in textured thin films have always been problematic. In this article, a new experimental method using grazing-incidence X-ray diffraction is presented with its principles based upon the conventional sin2ψ method. Instead of using the Bragg–Brentano (B-B) or Seemann–Bohlin geometry, the proposed method utilizes an asymmetrical diffraction geometry for which the X-ray beam is incident at a grazing angle γ to the sample surface, while the angle ψ is the tilt angle of the sample surface as defined by the conventional sin2ψ method. Basic equations involved in the X-ray residual stress analysis are described, along with exemplified experimental data. Analysis shows that, for an isotropic medium, strain measured using this grazing-incidence geometry assumes a linear relationship with the geometrical parameter cos2α sin2ψ, where the angle α is a constant and is defined as the Bragg angle at ψ=0°, θo, minus the grazing incidence angle γ, i.e. α=θo−γ. The grazing-incidence diffraction geometry effectively increases the irradiation volume from a thin-film specimen, thereby giving rise to higher intensity for high-angle Bragg peaks than the conventional B-B geometry. The proposed analysis has another advantage, in that the inhomogeneous sample casts little effect on the residual stress results when compared to the traditional sin2ψ method. [Copyright &y& Elsevier]
- Subjects :
- *THIN films
*RESIDUAL stresses
Subjects
Details
- Language :
- English
- ISSN :
- 00406090
- Volume :
- 418
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Thin Solid Films
- Publication Type :
- Academic Journal
- Accession number :
- 7911165
- Full Text :
- https://doi.org/10.1016/S0040-6090(02)00680-6