Microstructural characterization of ultrafine-grained nickel

Zhilyaev, Alexander P.; Gubicza, Jenő; Nurislamova, G. V.; Révész, Ádám; Suriñach, S.; Baró, Maria Dolores; Ungár, T.

doi:10.1002/pssa.200306608

Cited by 90 publications

(67 citation statements)

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“…A similar layer, although of higher thickness (75 m), was measured by Thiriet et al [38] on AISI 316L. Also, several authors demonstrated that severe plastic deformation (SPD) can induce grain size reductions of several orders of magnitude: pure metals can be refined down to maximum 140 nm [39], dispersion alloys to 50 nm [40] and solid solution alloys to 26 nm [41]. Although shot penning implies less intense surface deformation than attrition peening and also it is not a SPD process, cross-section observations point out that it has produced comparable consequences in the present case.…”

Section: Figure 4 A) Cross-section Electron Backscattered Diffractiosupporting

confidence: 69%

Effect of shot peening on metastable austenitic stainless steels

Fargas

Roa

Mateo

2015

Materials Science and Engineering: A

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In this work, shot peening was performed in a metastable austenitic stainless steel EN 1.4318 (AISI 301LN) in order to evaluate its effect on austenite to martensite phase transformation and also the influence on the fatigue limit. Two different steel conditions were considered: annealed, i.e., with a fully austenitic microstructure, and cold rolled, consisting of a mixture of austenite and martensite. X-ray diffraction, electron backscattered diffraction and focus ion beam, as well as nanoindentation techniques, were used to elucidate deformation mechanisms activated during shot peening and correlate with fatigue response. Results pointed out that extensive plastic deformation and phase transformation developed in annealed specimens as a consequence of shot peening.However, the increase of roughness and the generation of microcracks led to a limited fatigue limit improvement. In contrast, shot peened cold rolled specimens exhibited enhanced fatigue limit. In the latter case, the main factor that determined the influence on the fatigue response was the distance from the injector, followed successively by the exit speed of the shots and the coverage factor.

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Section: Figure 4 A) Cross-section Electron Backscattered Diffractiosupporting

confidence: 69%

Effect of shot peening on metastable austenitic stainless steels

Fargas

Roa

Mateo

2015

Materials Science and Engineering: A

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“…In practice, these treatments have the disadvantage that they are specific to any selected alloy and new treatments must be developed for each separate alloy. An alternative possibility is to attain a UFG structure through the use of a processing technique involving the application of severe plastic deformation (SPD): examples of SPD processing include equal-channel angular pressing (ECAP) [1][2][3], high-pressure torsion (HPT) [3][4][5], accumulative rollbonding (ARB) [6][7][8], friction stir processing (FSP) [9][10][11] or combinations of these techniques such as ARB followed by FSP [12] or ECAP followed by HPT [13][14][15]. An important advantage of SPD processing is that the same procedure may be used to introduce UFG structures into a wide range of metallic alloys.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the grain boundary misorientation data were combined with results obtained using high-resolution X-ray diffractometry [14] and differential scanning calorimetry [15] to estimate the grain boundary surface energy in the ultrafine-grained pure Ni.…”

Section: Introductionmentioning

confidence: 99%

The microstructural characteristics of ultrafine-grained nickel

Zhilyaev

Kim

Szpunar

et al. 2005

Materials Science and Engineering: A

198

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“…Dislocations have been intensively studied in cubic metals [69] (Al [70], Al-alloys [70][71][72], Cu [73][74][75][76][77][78][79][80], Ni [81][82][83]) processed at room temperature by SPD procedures, e.g. by equal-channel angular pressing (ECAP) or high-pressure torsion (HPT).…”

Section: Dislocation Structure In Cubic Nanomaterialsmentioning

confidence: 99%

Microstructure of Bulk Nanomaterials Determined by X‐Ray Line‐Profile Analysis

Ungár¹,

Schafler²,

Gubicza

2009

Bulk Nanostructured Materials

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The physical properties of structural materials are determined by their microstructure. The microstructure can be investigated either by direct methods, especially transmission or scanning electron microscopy (TEM or SEM), or by the indirect methods, like X-ray line-profile analysis (XLPA), differential scanning calorimetry (DSC), residual electrical resistivity (RER) or the different methods of mechanical testing. All these methods, irrespective of whether direct or indirect, reflect different aspects of the different microstructure features. The more methods that are used, the more comprehensive will be the microstructure characterization. In the present work the method of XLPA is summarized and discussed in comparison with other methods listed here. It is attempted to reveal how XLPA can contribute to a more complete characterization of the microstructure of bulk nanomaterials, especially when combined with other methods. General Concept and the Basic Ideas of X-ray Line-profile AnalysisWithin the framework of the kinematical scattering theory, the ideal diffraction pattern of a polycrystalline specimen consists of narrow, symmetrical, deltafunction-like peaks at the positions of the exact Bragg angles according to the well-defined unit cell of the crystal

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Microstructural characterization of ultrafine-grained nickel

Cited by 90 publications

References 0 publications

Effect of shot peening on metastable austenitic stainless steels

Effect of shot peening on metastable austenitic stainless steels

The microstructural characteristics of ultrafine-grained nickel

Microstructure of Bulk Nanomaterials Determined by X‐Ray Line‐Profile Analysis

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