Mössbauer analysis of submicrometer grained iron

Valiev, Ruslan Z.; Mulyukov, R. R.; Ovchinnikov, V. V.; Шабашов, В. А.

doi:10.1016/0956-716x(91)90145-q

Cited by 66 publications

(22 citation statements)

References 6 publications

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“…[1][2][3][4][5] Researchers all across the world are actively pursuing the research to understand the entire spectrum of properties of UFG materials. Among others, mechanical behavior is of paramount importance for structural application.…”

Section: Easy Accessibility Of An Ultrafine-grained (Ufg)mentioning

confidence: 99%

Ultrafine-Grained Al-Mg-Sc Alloy via Friction-Stir Processing

Kumar

Mishra

2012

Metall Mater Trans A

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Friction-stir processing (FSP) of twin-roll cast (TRC) Al-Mg-Sc alloy resulted into ultrafinegrained microstructure. The alloy was processed in as-received and aged (563 K [290°C], 22 hours) conditions and at three different tool rotation rates: 800, 400, and 325 rpm. The microstructural features were characterized using electron backscattered diffraction (EBSD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The grain size varied from 0.89 lm to 0.39 lm depending on the processing and initial thermo-mechanical conditions of the alloy. The TRC alloy processed at 325 rpm in aged condition had all the grains less than 1 lm, and 95 pct of grains had high-angle grain boundaries (HAGBs). In all the cases, the fraction of HAGBs were more than 80 pct. The variation of misorientation angle distribution was similar to the theoretical MacKenzie distribution for cubic crystal materials. Grain size analysis at different sections and locations on the transverse section of the dynamically recrystallized zone showed a homogeneous and equiaxed microstructure. The average dispersoid (Al 3 (Sc,Zr)) size was~8.0 nm in diameter obtained using high-resolution TEM. Grain size reduction was observed with increase in Zener-Hollomon parameter. It was shown that under the current microstructural and deformation conditions, dynamic recrystallization via particlestimulated nucleation might not be possible during FSP.

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Section: Easy Accessibility Of An Ultrafine-grained (Ufg)mentioning

confidence: 99%

Ultrafine-Grained Al-Mg-Sc Alloy via Friction-Stir Processing

Kumar

Mishra

2012

Metall Mater Trans A

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“…Due to increasing interest in nanostructured materials in recent years, various synthesis techniques for nanostructured or ultrafine-grained materials have been developed based on the plastic deformation of coarsegrained polycrystals, such as ball milling, 1,2 cold rolling, 3,4 equal-channel angular pressing, 5,6 high-pressure torsion, 7,8 and surface mechanical attrition. 9,10 Therefore, understanding the underlying mechanisms of grain refinement induced by plastic straining is crucial, especially at the nanometer scale.…”

Section: Introductionmentioning

confidence: 99%

Grain refinement at the nanoscale via mechanical twinning and dislocation interaction in a nickel-based alloy

et al. 2004

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A nanostructured surface layer was formed on an Inconel 600 plate by subjecting it to surface mechanical attrition treatment at room temperature. Transmission electron microscopy and high-resolution transmission electron microscopy of the treated surface layer were carried out to reveal the underlying grain refinement mechanism. Experimental observations showed that the strain-induced nanocrystallization in the current sample occurred via formation of mechanical microtwins and subsequent interaction of the microtwins with dislocations in the surface layer. The development of high-density dislocation arrays inside the twin-matrix lamellae provides precursors for grain boundaries that subdivide the nanometer-thick lamellae into equiaxed, nanometer-sized grains with random orientations.

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“…The material in the defect cores is in a constrained The nature of the grain boundaries or intergrain volumes in nanostructured materials is the subject of continuing study. "Grain boundary widths" have been estimated to be from 0.5-1 nm [7] to as high as 7-8 nm [8]. Estimates of the density of such regions vary from 40 to 85% of that of the grain interiors.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Deformation Behavior of Nanostructured Ceramics

McHargue

1997

Synthesis and Properties of Advanced Materials

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Mössbauer analysis of submicrometer grained iron

Cited by 66 publications

References 6 publications

Ultrafine-Grained Al-Mg-Sc Alloy via Friction-Stir Processing

Ultrafine-Grained Al-Mg-Sc Alloy via Friction-Stir Processing

Grain refinement at the nanoscale via mechanical twinning and dislocation interaction in a nickel-based alloy

Mechanical Properties and Deformation Behavior of Nanostructured Ceramics

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