Microstructural parameters from X-ray diffraction peak broadening

Ungár, Tamás

doi:10.1016/j.scriptamat.2004.05.007

Cited by 847 publications

(359 citation statements)

References 32 publications

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“…Pure Mg (Not shown here), had the same behavior as for other samples regarding the (002) orientation. The (002) orientation is the main slip plane of α-Mg and, as observed earlier 47,48,49,50 , is one of the best orientation for hydrogen absorption.…”

Section: Methodssupporting

confidence: 67%

Severe Plastic Deformation and Additive Distribution in Mg-Fe to Improve Hydrogen Storage Properties

et al. 2017

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Magnesium (Mg) is a light metal with relatively low cost. Its hydride (MgH 2 ) is interesting for the safe hydrogen storage in solid state and has a high gravimetric capacity of 7.6%. Practical application of Mg is still hampered by high reaction temperatures and slow kinetics. In order to improve it and focus on more viable industrial processing conditions, Mg plates, with or without iron (Fe) addition, in the form of wires and powders, were submitted to severe plastic deformation (SPD) in air, starting with extensive cold rolling (ECR), followed by repetitive rolling (ARB). The samples were characterized by X-ray diffraction (XRD), optical microscopy (OM), scanning (SEM) and transmission electron microscopy (TEM). H 2 storage properties were evaluated by differential scanning calorimetry (DSC) and Sievert's volumetric method. Mg processed by ECR+ARB resulted in larger grain refinement and densities of cracks than ECR. In addition, Fe in the form of continuous wires was fragmented and resulted in a better distribution of particles than powders, which agglomerated. Thus, finally, the synergetic effect of microstructural features and Fe as catalyst and its distribution improved activation, kinetics and hydrogen storage capacity.

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Section: Methodssupporting

confidence: 67%

Severe Plastic Deformation and Additive Distribution in Mg-Fe to Improve Hydrogen Storage Properties

et al. 2017

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“…[16] They may also be hollow crystals, or crystals containing many defects or have incorporated organic matrix. [17,18] All types of crystal imperfections would lead to extra XRD peak broadening due to microstrain, resulting in a smaller value of crystal size. Figure 1.…”

Section: Crystal Size and Morphologymentioning

confidence: 99%

What Can Electron Microscopy Tell Us Beyond Crystal Structures?

Zhou

Greer

2016

Eur J Inorg Chem

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Transmission electron microscopy is a powerful tool to directly image crystal structures. Not only that, it is often used to reveal crystal size and morphology, crystal orientation, crystal defects, surface structures, superstructures, etc. However, due to the 2D nature of TEM images, it is easy to make mistakes when we try to recover a 3D structure from them. Scanning electron microscopy is able to provide information on the parti-

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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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Microstructural parameters from X-ray diffraction peak broadening

Cited by 847 publications

References 32 publications

Severe Plastic Deformation and Additive Distribution in Mg-Fe to Improve Hydrogen Storage Properties

Severe Plastic Deformation and Additive Distribution in Mg-Fe to Improve Hydrogen Storage Properties

What Can Electron Microscopy Tell Us Beyond Crystal Structures?

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

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