Superplasticity in a 7055 aluminum alloy processed by ECAE and subsequent isothermal rolling

Nikulin, Ilya; Kaibyshev, Rustam; Sakai, Taku

doi:10.1016/j.msea.2005.06.014

Cited by 63 publications

(36 citation statements)

References 17 publications

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“…1a. Effect of grain size on superplastic strain rate in Al alloys; [7] datum points for ECAP [11][12][13][14][15][16][17][18][19][20] are in black and for HPT [21][22][23][24][25][26][27][28][29] in red; the encircling ovals are in blue for ECAP and pink for HPT and the solid line corresponds to eq. (2) in the text.…”

Section: Figure Captionsmentioning

confidence: 99%

“…[7,10] The experimental results shown in Fig. 1[a] are taken from various reports for Al alloys, [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] and in Fig. 1 [b] there are similar sets of data for a range of Mg alloys [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49] where the upper solid lines in Figs 1[a] and [b] show the predicted normalized strain rates derived using eq.…”

Section: Introductionmentioning

confidence: 99%

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The Strength–Grain Size Relationship in Ultrafine-Grained Metals

Balasubramanian

Langdon

2016

Metall Mater Trans A

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Metals processed by severe plastic deformation [SPD] techniques, such as equal-channel angular pressing [ECAP] and high-pressure torsion [HPT], generally have submicrometer grain sizes. Consequently, they exhibit high strength as expected on the basis of the HallPetch [H-P] relationship. Examples of this behavior are discussed using data on Ti, Al-Mg 1 and Ni. These materials typically have grain size above ~50 nm where softening is not expected. An increase in strength is usually accompanied by a decrease in ductility. High strength and ductility can be achieved simultaneously by imposing high strains to give both ultrafine grain sizes and a high fraction of high-angle grain boundaries. An example is presented for a cast Al-7% Si alloy processed by HPT. In some cases, SPD may produce a fine grain size but also lead to a weakening due to microstructural changes as in ECAP of an Al-7034 alloy and HPT of Zn-22% Al. In SPD-processed materials, grain boundary segregation and nanostructural features are present which may lead to higher strengths than those predicted by the H-P relationship in some alloys having nano grain sizes.

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Section: Figure Captionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Strength–Grain Size Relationship in Ultrafine-Grained Metals

Balasubramanian

Langdon

2016

Metall Mater Trans A

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“…30) There have been several reports on the microstructures and mechanical properties of UFG metals processed by the combinations of ECAP and cold rolling. [31][32][33][34][35] Most of them reported that post-ECAP cold-rolling modifies the UFG structures, and have favourable effect on the strength 31,32) and superplastic deformation. [33][34][35] In our study, however, the objective of ECAP is to control the texture and recrystallization by introducing deformation bands prior to cold rolling.…”

Section: Introductionmentioning

confidence: 99%

“…[31][32][33][34][35] Most of them reported that post-ECAP cold-rolling modifies the UFG structures, and have favourable effect on the strength 31,32) and superplastic deformation. [33][34][35] In our study, however, the objective of ECAP is to control the texture and recrystallization by introducing deformation bands prior to cold rolling. Following our previous results, 29,30) we further examined the effect of intense simple shear deformation by ECAP for one pass prior to cold rolling in more detail.…”

Section: Introductionmentioning

confidence: 99%

Effect of Simple Shear Deformation Prior to Cold Rolling on Texture and Ridging of 16% Cr Ferritic Stainless Steel Sheets

et al. 2010

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“…[8] Boundary misorientations have been measured in several studies of ECAE plates. [11,12] However, since these measurements were conducted only in one plane, a complete description of the boundary network formed during ECAE deformation of plates has not been provided.…”

Section: Ov Mishin Vm Segal and S Ferrassementioning

confidence: 99%

Quantitative Microstructural Characterization of Thick Aluminum Plates Heavily Deformed Using Equal Channel Angular Extrusion

Mishin

Segal

Ferrasse

2012

Metall Mater Trans A

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A detailed quantitative analysis of the microstructure has been performed in three orthogonal planes of 15-mm-thick aluminum plates heavily deformed via two equal channel angular extrusion (ECAE) routes. One route was a conventional route A with no rotation between passes. Another route involved sequential 90 deg rotations about the normal direction (ND) between passes. The microstructure in the center of these plates, and especially the extent of microstructural heterogeneity, has been characterized quantitatively and compared with that in bar samples extruded via either route A or route Bc with 90 deg rotations about the longitudinal axis. Statistically robust data were obtained in this work using gallium enhanced microscopy and EBSD mapping of large sample areas. For the plate processed using route A, the fraction of high-angle boundaries was found to strongly depend on the inspection plane, being smallest in the plane perpendicular to the ND (plane Z), where the largest subgrain size and most profound microstructural heterogeneities were also revealed. In comparison, the plate extruded with 90 deg rotations about the ND was less heterogeneous and contained smaller subgrains in plane Z. Comparing the plate and bar samples, the most refined and least heterogeneous microstructure was observed in the route Bc bar sample. The differences in the microstructure are reflected in the hardness data; the hardness is lowest after ECAE via route A and greatest in the bar sample processed using route Bc.

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Superplasticity in a 7055 aluminum alloy processed by ECAE and subsequent isothermal rolling

Cited by 63 publications

References 17 publications

The Strength–Grain Size Relationship in Ultrafine-Grained Metals

The Strength–Grain Size Relationship in Ultrafine-Grained Metals

Effect of Simple Shear Deformation Prior to Cold Rolling on Texture and Ridging of 16% Cr Ferritic Stainless Steel Sheets

Quantitative Microstructural Characterization of Thick Aluminum Plates Heavily Deformed Using Equal Channel Angular Extrusion

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