Textural and Microstructural Characterization of Equal Channel Angular Pressed Nickel

Skrotzki, Werner; Tamm, R.; Klemm, R. B.; Thiele, E.; Holste, C.; Baum, H.

doi:10.4028/www.scientific.net/msf.408-412.667

Cited by 8 publications

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“…ECAP has been extensively applied over the last decade on a wide variety of metals and alloys [1,20]. Numerous studies documenting the textural and microstructural evolution of ECAPed Ni [21] and the grain refinement of pure Ni after ECAP [22] have been published. There are also many reports on SPD of Ni based alloys as Ni-Ti alloys [23,24].…”

Section: Introductionmentioning

confidence: 99%

Study of the microstructure and texture heterogeneities of Fe–48wt%Ni alloy severely deformed by equal channel angular pressing

et al. 2018

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A Fe-48wt%Ni alloy was processed by severe plastic deformation using equal channel angular pressing process. A stacking of 9 sheets was introduced and pressed up to two passes into die with an inner angles of Φ=90º and outer arc of curvature ψ= 17° at room temperature following route A. The same material in bulk form was also ECAPed up to one pass. The microstructure and the texture were investigated by means of electron backscattered diffraction and X-ray diffraction, respectively. To evaluate the mechanical response, Vickers microhardness was carried out. The given analyses concern the asreceived sample, the peripheral and the central plates of the pressed stacks and the upper, the middle and the lower parts of the pressed bulk material. The deformation was heterogeneous and variations in texture and microstructure, resulting from different efficiencies in the shearing process, were locally noted. For the stacks samples, the microstructure evolved from equiaxed grains of 9 μm with high fraction of high-angle grain boundaries (around 90%) to a heterogeneous fine grain structure with an average grain size of 3 m after two passes. On the contrary, for the bulk sample, the evolution was 2 to a banded structure after one pass. Results of mechanical property show that microhardness increased significantly from 147 Hv before deformation to mean values of 244 (after one pass) and 235 Hv (after two passes) for the bulk and stacked samples, respectively. The Hall-Petch effect and dislocation density were evaluated as the most responsible in material strengthening.

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Section: Introductionmentioning

confidence: 99%

Study of the microstructure and texture heterogeneities of Fe–48wt%Ni alloy severely deformed by equal channel angular pressing

et al. 2018

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“…Some recent literature that deals with texture formation during ECAE are very specific regarding the initial conditions of the materials investigated. Most of the works deal with texture formation in Al and Al alloys [6][7][8][9] as well as in Cu, [10][11][12][13][14][15][16][17][18] and a few on other fcc materials such as Ni, [19] von Mises ෂ 1.15 and very recently on Ag. [20] A few articles have been published on texture evolution in Fe [21,22] during ECAE.…”

Section: Introductionmentioning

confidence: 99%

Evolution of crystallographic texture during equal channel angular extrusion of copper: The role of material variables

Suwas

Arruffat-Massion

Tóth

et al. 2006

Metall Mater Trans A

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The evolution of crystallographic texture during equal channel angular extrusion (ECAE) using route A has been investigated experimentally as well as by simulations for three types of materials: pure, commercially pure, and impure (cast) copper. The ECAE texture of copper can be compared with simple shear textures. However, there are deviations in terms of location of the respective components. These differences can be nearly reproduced using a recent flow line approach for ECAE deformation (L.S. Tóth, R. Arruffat-Massion, L. Germain, S.C. Baik, and S. Suwas: Acta Mater., 2004Mater., , vol. 52, pp. 1885 with the help of the viscoplastic self-consistent polycrystal model. The main texture components common to all three materials are A 1E and ; the latter ones are significantly stronger in the cast material. The effect of further deformation on texture modification depends on material variables, such as purity, initial microstructure, and texture.

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“…The size and size-distribution of crystallites, grains, or subgrains, and the dislocation structure were studied intensively in different metals and alloys, e.g. Al [69], Al-alloys [69][70][71], Cu [72][73][74][75][76][77][78], or Ni [79][80][81], processed by SPD procedures at room temperature, e.g. by equal channel angular pressing (ECAP) or high pressure torsion (HPT).…”

Section: 5mentioning

confidence: 99%

Nanocrystalline materials studied by powder diffraction line profile analysis

Ungár¹,

Gubicza²

2007

Zeitschrift Für Kristallographie - Crystalline Materials

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Abstract. X-ray powder diffraction is a powerful tool for characterising the microstructure of crystalline materials in terms of size and strain. It is widely applied for nanocrystalline materials, especially since other methods, in particular electron microscopy is, on the one hand tedious and time consuming, on the other hand, due to the often metastable states of nanomaterials it might change their microstructures. It is attempted to overview the applications of microstructure characterization by powder diffraction on nanocrystalline metals, alloys, ceramics and carbon base materials. Whenever opportunity is given, the data provided by the X-ray method are compared and discussed together with results of electron microscopy. Since the topic is vast we do not try to cover the entire field.

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Textural and Microstructural Characterization of Equal Channel Angular Pressed Nickel

Cited by 8 publications

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Study of the microstructure and texture heterogeneities of Fe–48wt%Ni alloy severely deformed by equal channel angular pressing

Study of the microstructure and texture heterogeneities of Fe–48wt%Ni alloy severely deformed by equal channel angular pressing

Evolution of crystallographic texture during equal channel angular extrusion of copper: The role of material variables

Nanocrystalline materials studied by powder diffraction line profile analysis

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