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  • 1
    Electronic Resource
    Electronic Resource
    Application of Energy Dispersive X-Ray Diffraction for the Efficient Investigation of Internal Stresses in Thin Films (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 130 (Dec. 2007), p. 39-42 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Internal stresses are very important for the performance of protective hard coatings. Tensile stressesfavour the formation and propagation of cracks, inducing fracture and corrosion. Mediumcompressive stresses hinder fatigue. But high compressive stresses, typically for hard coatingsproduced by PVD (physical vapour deposition) processes, support delamination in order to relax thestored elastic energy. However notwithstanding its relevance, the internal stresses are only seldomused for the optimisation and quality control of hard coatings in industry. This unsatisfying situationis caused by the deficit in efficient measuring methods. The results of thin sheets, where the stressescan be simply measured by their curvature, are not necessarily representative for the coating ofthicker parts. The conventional XRD (X-ray Diffraction), based on angle-dispersive evaluationneeds expensive devices and is rather time consuming. The energy-dispersive technique opens newpossibilities. It is based on polychromatic radiation. The interference of the lattice plane reflectionscorresponding to the Bragg-equation is investigated by the diffraction intensity of the differentwavelength (or photon energies), not by varying the Bragg-angle as in conventional XRD. Hence,the whole diffraction pattern can be obtained in one shoot without the use of any goniometer. Thisallows the construction of small and compact measuring devices and the reduction of measuringtime to a few minutes. The capability of the ED-XRD (Energy Dispersive X-ray Diffraction) isdemonstrated for titanium nitride and chromium nitride films deposited by cathodic vacuum arcwith varying parameters. Comparisons were made with the much more time-consuming AD-XRD(Angle Dispersive X-ray Diffraction) for residual stress analysis. The results of both methods are ingood agreement
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.130.39.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Evolution of Microstrains at Cyclic Incremental Deformation of Steel 42CrMo4 (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 524-525 (Sept. 2006), p. 925-930 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: X-ray diffraction line profiles of a ferritic-pearlitic steel at different stages ofmonotonic and cyclic incremental strain paths were recorded and peak broadening wasregarded. Evaluation of integral peak widths shows, that the distortion of structure is stronglydependent on the deformation path. The results for peak broadening at different deformationstates correlate with flow stress behaviour and can be explained with certain dislocationarrangements
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.524-525.925.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Investigations of residual stresses in carbon fibre/aluminium-composites using X-ray diffraction (1998)
    Springer
    Fresenius' journal of analytical chemistry 361 (1998), S. 652-653 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Investigations of residual stresses have been carried out on unidirectionally carbon fibre reinforced aluminium using X-ray diffraction. It was found that the carbon exists in compression parallel to the fibre axis and in tension perpendicular to the fibre axis after the fabrication of the MMCs by a liquid infiltration process. Furthermore, it was observed that the intermetallic phase Al3Ni was in tension (+ 100 MPa) parallel to the fibre axis and in considerable residual compression (– 400 MPa) perpendicular to the fibre axis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050981
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    Paper (German National Licenses)
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