Grain to grain slip activity in plastically deformed Zr determined by X-ray micro-diffraction line profile analysis

Ungár, Tamás; Castelnau, Olivier; Ribárik, Gabor; Drakopoulos, M.; Béchade, Jean Luc; Chauveau, Thierry; Snigirev, A.; Snigireva, I.; Schroer, Christian G.; Bacroix, Brigitte

doi:10.1016/j.actamat.2006.09.031

Cited by 83 publications

(33 citation statements)

References 34 publications

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“…These measurements are more rarely completed by the assessment of ρ c , which involves tedious and long counting procedures [4,6]. With XRD, which is a more statistical method, the analysis of the shape of a Bragg peak (and especially the broadening of the peak) measured inside a grain or a texture component is used to assess one "average" dislocation density, usually estimated to be the sole density of the isolated dislocations ρ c [11,[14][15][16]. The main argument advanced to eliminate any influence of the dislocation boundaries observed in highly deformed materials on peak broadening is of different types.…”

Section: Introductionmentioning

confidence: 99%

The evolution with strain of the stored energy in different texture components of cold-rolled IF steel revealed by high resolution X-ray diffraction

Wauthier-Monnin

Chauveau

Castelnau

et al. 2015

Materials Characterization

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. During the deformation of low carbon steel by cold-rolling, dislocations are created and stored in grains depending on local crystallographic orientation, deformation, and deformation gradient. Orientation dependent dislocation densities have been estimated from the broadening of X-ray diffraction lines measured on a synchrotron beamline. Different cold-rolling levels (from 30% to 95% thickness reduction) have been considered. It is shown that the present measurements are consistent with the hypothesis of the sole consideration of screw dislocations for the analysis of the data. The presented evolutions show that the dislocation density first increases within the α fiber (={hkl}b110N) and then within the γ fiber (={111}buvwN). A comparison with EBSD measurements is done and confirms that the storage of dislocations during the deformation process is orientation dependent and that this dependence is correlated to the cold-rolling level. If we assume that this dislocation density acts as a driving force during recrystallization, these observations can explain the fact that the recrystallization mechanisms are generally different after moderate or large strains.

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Section: Introductionmentioning

confidence: 99%

The evolution with strain of the stored energy in different texture components of cold-rolled IF steel revealed by high resolution X-ray diffraction

Wauthier-Monnin

Chauveau

Castelnau

et al. 2015

Materials Characterization

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“…For materials containing two or more phases, it generally is more convenient to use XRD as the peaks of the constituent phases appear distinctly in the profile. Several XRDLPA investigations have been performed on steels [22][23][24][25][26], Cu [27][28][29] and Zr [30][31] alloys. In contrast, a fewer number of investigations using the XRDLPA have been performed on Ti alloys [32][33][34].…”

Section: Introductionmentioning

confidence: 99%

The effect of cooling rates on the microstructure and mechanical properties of thermo-mechanically processed Ti–Al–Mo–V–Cr–Fe alloys

Ahmed

Savvakin

Ивасишин

et al. 2013

Materials Science and Engineering: A

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The effect of cooling rates on the microstructure and mechanical properties of thermo-mechanically processed Ti-Al-Mo-V-Cr-Fe alloys AbstractTwo near-β titanium alloys, Ti-5Al-5Mo-5V-1Cr-1Fe and a modified one containing 2 wt% Cr (Ti-5Al-5Mo-5V-2Cr-1Fe) were produced from Ti hydride precursor powders via the cost-effective blended elemental powder metallurgy technique. The effects of two cooling rates (10 K s−1 and 1 K s−1) during thermo-mechanical processing on the microstructure and mechanical properties were investigated using X-ray diffraction and scanning electron microscopy. X-ray line profile analysis revealed that dislocation densities and microstrain in β-Ti phase are higher than in α-Ti phase for all cases. In both alloys, slower cooling results in an increase in α volume fraction and promotes morphology of continuous grain boundary α phase. A lower total elongation is obtained in both alloys under slower cooling which could be accounted for by the continuous morphology of α phase. Overall, Ti-5Al-5Mo-5V-1Cr-1Fe displays higher ultimate tensile strength and total elongation compared to Ti-5Al-5Mo-5V-2Cr-1Fe, regardless of the cooling rate. Two near-β titanium alloys, Ti-5Al-5Mo-5V-1Cr-1Fe and a modified one containing 2 wt. % Cr (Ti-5Al-5Mo-5V-2Cr-1Fe) were produced from Ti hydride precursor powders via the cost-effective blended elemental powder metallurgy technique. The effects of two cooling rates (10 Ks -1 and 1 Ks -1 ) during thermo-mechanical processing on the microstructure and mechanical properties were investigated using X-ray diffraction and scanning electron microscopy. X-ray line profile analysis revealed that dislocation densities and microstrain in β-Ti phase are higher than in α-Ti phase for all cases. In both alloys, slower cooling results in an increase in α volume fraction and promotes morphology of continuous grain boundary α phase. A lower total elongation is obtained in both alloys under slower cooling which could be accounted for by the continuous morphology of α phase. Overall, Ti-5Al-5Mo-5V-1Cr-1Fe displays higher ultimate tensile strength and total elongation compared to Ti-5Al-5Mo-5V-2Cr-1Fe, regardless of the cooling rate.

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“…Further, it is likely to be useful to study the line broadening of X-ray diffraction peaks in this work, since the line broadening is known to be closely correlated with the plastic deformation due to dislocations. [19][20][21] 3.4 Influence of irreversible strain on recovery strain Figure 5 shows the full width at half maximum (FWHM) of the diffraction peaks of fcc{111} and hcp{101} for the samples that were deformed by different tensile strains and subsequently heated. The diffraction patters for the FWHM measurements were typically obtained from patterns tilted by 45 with respect to the tensile direction.…”

Section: Reverse Transformation By Heatingmentioning

confidence: 99%

Characteristic Structural Changes in Stress-Induced Martensitic Transformation and Reverse Transformation of a Polycrystalline Fe-Mn-Si Alloy

et al. 2008

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Debye rings obtained by synchrotron X-ray diffraction were analyzed for investigating structural changes caused by stress-induced martensitic transformation and reverse transformation of a polycrystalline austenitic Fe-Mn-Si shape memory alloy. The chemical composition of the shape memory alloy was Fe-28 mass%Mn-6 mass%Si-5 mass%Cr. The results showed that a part of the austenitic phase was transformed to a martensitic " phase by room-temperature tensile deformation, and the " phase was reversely transformed by subsequent heating. Diffraction intensities in Debye rings changed non-uniformly on tensile deformation and heating, indicating that occurrences of the stressinduced and reverse transformation depend on the crystallographic orientations of grains with respect to the tensile direction. The optimum recovery strain induced by the reverse transformation was obtained for a sample deformed by about 10% tensile strain, which was consistent with the structural changes caused by the reverse transformation. X-ray diffraction lines were shown to be broadened by tensile strain. This indicated that irreversible deformation due to dislocations restricted the reverse transformation, leading to the optimum recovery strain.

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Grain to grain slip activity in plastically deformed Zr determined by X-ray micro-diffraction line profile analysis

Cited by 83 publications

References 34 publications

The evolution with strain of the stored energy in different texture components of cold-rolled IF steel revealed by high resolution X-ray diffraction

The evolution with strain of the stored energy in different texture components of cold-rolled IF steel revealed by high resolution X-ray diffraction

The effect of cooling rates on the microstructure and mechanical properties of thermo-mechanically processed Ti–Al–Mo–V–Cr–Fe alloys

Characteristic Structural Changes in Stress-Induced Martensitic Transformation and Reverse Transformation of a Polycrystalline Fe-Mn-Si Alloy

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