Effect of the Surface Layer Strained by Mechanical Grinding on X-ray Diffraction Analysis

Jiang, Fulin; Hirata, Kentaro; Masumura, Takuro; Takaki, Setsuo

doi:10.2355/isijinternational.isijint-2017-578

Cited by 36 publications

(11 citation statements)

References 9 publications

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“…The XRD analysis was carried out on the polished specimens [ 31 ] of the monolithic magnesium alloy AZ91 and its composites using MiniFlex 300/600 Regaku tabletop XRD diffractometer (Tokyo, Japan) to determine the possible phases available. The samples were exposed to Cu K-α radiation ( λ = 1.5406 Å) at a scanning speed of 10°/min and step width of 0.020 deg.…”

Section: Methodsmentioning

confidence: 99%

Effect of SiC Reinforcement and Its Variation on the Mechanical Characteristics of AZ91 Composites

Kumar

Mukhopadhyay

et al. 2020

Materials

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In this study, the processing of SiC particulate-strengthened magnesium alloy metal matrix composites via vacuum supported inert atmosphere stir casting process is presented. The effects of small variations in the SiC particulate (average size 20 µm) reinforcement in magnesium alloy AZ91 were examined. It was found that with the addition of SiC particulate reinforcement, the hardness improved considerably, while the ultimate tensile and yield strength improved slightly. The density and porosity of the magnesium alloy-based composites increased with the increase in the wt.% of SiC particulates. The tensile and compressive fracture study of the fabricated composites was also performed. The tensile fractures were shown to be mixed-mode fractures (i.e., ductile and cleavage). The fractured surface also disclosed tiny dimples, micro-crack, and cleavage fractures which increases with increasing reinforcement. For the compression fracture, the surface microstructural studies of AZ91 displayed major shear failure and demonstrated the greater shear bands when compared to AZ91/SiC composites, which instead revealed rough fracture surfaces with mixed-mode brittle and shear features.

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Section: Methodsmentioning

confidence: 99%

Effect of SiC Reinforcement and Its Variation on the Mechanical Characteristics of AZ91 Composites

Kumar

Mukhopadhyay

et al. 2020

Materials

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“…The tensile-tested specimens with different strain were polished with sand paper and then electropolished in an acid mixture (H 3 PO 4 :CrO 3 = 2:1) by more than 50 µm, in order to eliminate the effect of strained layers by grinding. 24) The X-ray diffraction measurements, with a Cu-K¡ 1 radiation source (wavelength: 0.15418 nm), were carried out at 40 kV and 40 mA. The rotation speed of the detector was 0.8°/min.…”

Section: Methodsmentioning

confidence: 99%

Work-Hardening Mechanism in High-Nitrogen Austenitic Stainless Steel

et al. 2020

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The remarkably high work-hardening rate in high-nitrogen austenitic stainless steels is generally believed to be due to the promotion of dislocation accumulation by nitrogen addition. However, analysis of dislocation accumulation behavior by the modified Williamson-Hall/ Warren-Averbach method reveals that no difference to the increment of the dislocation density during deformation exists between austenitic steels with and without nitrogen. Since cross slipping is markedly suppressed in high-nitrogen steels, the moving dislocations are back-stressed by the planar dislocation arrays. This induces the deformation resistance and the high work-hardening rate.

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“…Subsequently, the surface of specimens was removed by 50 μm by electrolytic polishing to remove the surface layer affected by the sand paper grinding. 12) The rotation speed of detector was 0.003 deg/s. The instrumental function was corrected based on Voigt profiles analysis 13) using the standard material: LaB 6 , (No.…”

Section: Methodsmentioning

confidence: 99%

Dislocation Characterization by the Direct-fitting/modified Williamson–Hall (DF/mWH) Method in Cold Worked Ferritic Steel

Takaki

Masumura

2019

ISIJ International

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X-ray diffraction is a powerful tool for dislocation characterization, which includes evaluation of dislocation distribution, nature of dislocation, and dislocation density. In the Williamson-Hall (WH) plots, the full width at half maximum (FWHM) is plotted relative to the diffraction angle for each diffraction peak and the method corresponds to the basic approach for dislocation characterization. However, the elastic anisotropy in each crystal plane makes the analysis of WH plots difficult because elastic anisotropy also affects the FWHM of diffraction peaks. In order to correct the effect of elastic anisotropy, Ungár developed a unique methodology by using the contrast factor C, and this is termed as the modified Williamson-Hall (mWH) method. Conversely, researchers developed a new methodology termed as the "direct-fitting (DF) method," in which the elastic anisotropy is corrected by directly applying the diffraction Young's modulus ratio (ω). In the DF method, a linear relation is realized in the corrected WH plots, and reliable values are obtained for the parameter α that contains information on the crystallite size. In the present study, the α-value obtained using the DF method was applied to the mWH equation, and dislocation characterization was performed in a low carbon ferritic steel (Fe-0.0056%C) by cold rolling. The results indicated that increasing the extent of cold rolling decreases the screw component of dislocation, and monotonically increases the parameter φ (which contains the information of dislocation density). Additionally, the parameter A (which depends on the dislocation arrangement) was evaluated at approximately 0.50 for cold worked ferrite.

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Effect of the Surface Layer Strained by Mechanical Grinding on X-ray Diffraction Analysis

Cited by 36 publications

References 9 publications

Effect of SiC Reinforcement and Its Variation on the Mechanical Characteristics of AZ91 Composites

Effect of SiC Reinforcement and Its Variation on the Mechanical Characteristics of AZ91 Composites

Work-Hardening Mechanism in High-Nitrogen Austenitic Stainless Steel

Dislocation Characterization by the Direct-fitting/modified Williamson–Hall (DF/mWH) Method in Cold Worked Ferritic Steel

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