X-ray diffraction analysis of internal stresses in the dislocation structure of cyclically deformed nickel single crystals

Hecker, M.; Thiele, E.; Holste, C.

doi:10.1016/s0921-5093(97)00370-5

Cited by 21 publications

(8 citation statements)

References 11 publications

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“…In accordance with de®nitions used in previous works (Levine & Thomson, 1997;Groma, 1998;Unga Â r et al, 1982;Hecker et al, 1997;Zehetbauer et al, 1999;Unga Â r & Tichy, 1999), the effective outer cut-off radius of dislocations, R e , will be considered as de®ned in equation 3. R e and R H e are related as R e exp2R H e 7X39R H e X 25…”

Section: The Strain Profile For Dislocationsmentioning

confidence: 99%

Crystallite size distribution and dislocation structure determined by diffraction profile analysis: principles and practical application to cubic and hexagonal crystals

Ungár¹,

Gubicza²,

Ribárik³

et al. 2001

J Appl Cryst

709

376

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Two different methods of diffraction profile analysis are presented. In the first, the breadths and the first few Fourier coefficients of diffraction profiles are analysed by modified Williamson–Hall and Warren–Averbach procedures. A simple and pragmatic method is suggested to determine the crystallite size distribution in the presence of strain. In the second, the Fourier coefficients of the measured physical profiles are fitted by Fourier coefficients of well established ab initio functions of size and strain profiles. In both procedures, strain anisotropy is rationalized by the dislocation model of the mean square strain. The procedures are applied and tested on a nanocrystalline powder of silicon nitride and a severely plastically deformed bulk copper specimen. The X‐ray crystallite size distributions are compared with size distributions obtained from transmission electron microscopy (TEM) micrographs. There is good agreement between X‐ray and TEM data for nanocrystalline loose powders. In bulk materials, a deeper insight into the microstructure is needed to correlate the X‐ray and TEM results.

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Section: The Strain Profile For Dislocationsmentioning

confidence: 99%

Crystallite size distribution and dislocation structure determined by diffraction profile analysis: principles and practical application to cubic and hexagonal crystals

Ungár¹,

Gubicza²,

Ribárik³

et al. 2001

J Appl Cryst

709

376

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“…Some assumptions must be done about the compactness of dislocation arrangements and their nature and typical M values from the literature can be used. We approached the problem by a sort of "tuning" of the values by using the values of the M parameters obtained by CMWP and the proportionality factor 1/e 2 between the dislocation effective cut-off radius R e * and R e = e 2 R e * previously used as the effective outer cut-off radius of dislocations by a few authors [41][42][43]. That proportionality factor happens to contemplate three different levels of deformation and two temperature regimes, making both, W-H and CMWP results, quite similar, which supports the validity of W-H method as a fast evaluation tool.…”

Section: X-ray Diffractionmentioning

confidence: 99%

Evaluation of microstructure anisotropy on room and medium temperature ECAP deformed F138 steel

Vincentis

Kliauga

Ferrante

et al. 2015

Materials Characterization

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The microstructure developed during severe plastic deformation results in improved mechanical properties because of the decrease in domain sizes and accumulation of defects, mainly dislocation arrays. The characteristic deformation stages observed in low stacking fault energy (SFE) face centered cubic (FCC) materials are highly influenced by the development of the primary and secondary twinning that compete with dislocation glide. In this paper, a low SFE F138 stainless steel is deformed by equal channel angular pressing (ECAP) up to 4 passes at room temperature (RT) and at 300°C to compare the grain refinement and twin boundary development with increasing deformation. Tensile tests were performed to determine the deformation stages reached by the material before and after ECAP deformation, and the resulting microstructure was observed by TEM. X-ray diffraction and EBSD, average technique the first and local the second one, were used to quantify the microstructural changes, allowing the determination of diffraction domain sizes, dislocation and stacking fault densities and misorientation indices, which lead to a complete analysis of the deformation introduced in the material, with comparative correlations between various microstructural parameters.

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“…The samples, cut into bars having dimensions 19 mm×17 mm×12 mm, were scanned by XRD [5][6][7][8][9] (D/ MAX-RB, RIGAKU Co. Japan). The stress values of samples were calculated automatically by program.…”

Section: Xrd Stress Analysis and Sem Observationmentioning

confidence: 99%

Effect of the cool system on internal stress of CaO-Al2O3-SiO2 glass-ceramic system

Xie

et al. 2007

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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The samples were attained through altering the cooling system of producing glass-ceramics. The X-ray diffraction was used to test the stress value of different samples. The relation of the cooling system and internal stress were also investigated. The experimental results show that the stress of glass-ceramic had a close relation with starting cool temperature. Above 800 ℃, glass-ceramic could be accelerated cooling and did not bring stress. Temperature between 500 ℃ and 800℃ was an important temperature range of the formation of stress in glass-ceramic, in which the glass-ceramic stress would change obviously. Cool system was the key on how to control and eliminate internal stress in order to reduce the destroy of materials crated by internal stress. In addition, glass particles size increase, glass-ceramic stress increase in consequent.

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X-ray diffraction analysis of internal stresses in the dislocation structure of cyclically deformed nickel single crystals

Cited by 21 publications

References 11 publications

Crystallite size distribution and dislocation structure determined by diffraction profile analysis: principles and practical application to cubic and hexagonal crystals

Crystallite size distribution and dislocation structure determined by diffraction profile analysis: principles and practical application to cubic and hexagonal crystals

Evaluation of microstructure anisotropy on room and medium temperature ECAP deformed F138 steel

Effect of the cool system on internal stress of CaO-Al2O3-SiO2 glass-ceramic system

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