Semi-Continuous Equal-Channel Angular Extrusion and Rolling of AA5083 and AZ31 Alloys

Segal, V. M.; Reznikov, Svetlana V.; Murching, Nagendra; Hammond, Vincent H.; Kecskes, Laszlo J.

doi:10.3390/met9101035

Cited by 7 publications

(3 citation statements)

References 17 publications

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“…These particles are not beneficial as the presence of iron reduces the strengthening effect of the transition elements, manganese and chromium, because it readily forms insoluble, more brittle compounds that are prone to cracking during future processing as discussed by Anderson, Weritz, and Kaufman (2018b). Similar particles have been found within AA5083 by Segal et al (2019) which states the presence of a 'multicomponent' system within the AA5083. This forms three groups of intermetallic compounds; '(i) constituent particles (Al + Fe, Mn, Si) with a size range of 0.5-10 µm; (ii) dispersions (Al + Mg, Mn, Cr, Zn) with a size range 0.05-0.5 µm; and (iii) precipitates (beta-phase Mg2Al3) of a nanometer size'.…”

Section: Discussionsupporting

confidence: 72%

Investigation into the friction stir welding of thick section aluminium alloys

Brooks¹

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Friction stir welding (FSW) is a solid-state joining technology with a growing range of applications, many of them in safety critical service. These include aircraft wing spars and fusion reactor components, where the heat input associated with thick section components and long-term service performance are becoming increasingly important. However, there is a limited pool of published knowledge relating to FSW of thick section materials due to the previous industrial demand surrounding thin section welding. The primary aim of this research project was to investigate the influence of FSW using three different techniques joining 50 mm thick aluminium alloys AA5083-H111, AA6082-T651 and AA7050-T6451. These techniques, namely Weld-Flip-Weld (WFW), Simultaneous Double Sided (SDS) and Supported Stationary Shoulder (SSS) each have a different thermo-mechanical weld input and effect on the weld zone which have yet to be extensively investigated and quantified. The stir zone experienced large deformation and recrystallization resulting in an equiaxed and refined grain structure. Grain size was influenced by energy input with a greater input resulting in a larger grain structure. In each weld, constituent particles were identified with common elements of iron and aluminium being observed in all cases. Further particles of Mg2Si were found in AA5083 and AA6082 welds while Silica was recorded welds of AA7050. Simultaneous Double Sided FSW was shown to be an effective process and arguably the most appropriate for a wide range of industrial uses. In non-heat treatable AA5083 the process not only used less energy but also retained higher strength (298 MPa) than Weld-Flip-Weld (277 MPa). The retention of strength in the SDS weld in heat-treatable alloy AA7050 (352 MPa) and was not as high as that in the WFW weld (419 MPa), x however, coupled with the other benefits, such as faster production time and lower energy input, can be considered the most industrially suitable variant for AA7050- T7451.

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Section: Discussionsupporting

confidence: 72%

Investigation into the friction stir welding of thick section aluminium alloys

Brooks¹

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“…All works were performed by the EPM, Army Research Laboratory and ETFH forging crew. In accordance with previous results on the small-scale die (150 mm × 150 mm × 30 mm) [27], extrusion experiments were carried out for aluminum alloy 5083 and magnesium alloy AZ31 at the temperatures 250 °C and 275 °C, respectively. The die temperature was 200 °C.…”

Section: Industrial Verificationmentioning

confidence: 79%

Equal-Channel Angular Extrusion (ECAE): From a Laboratory Curiosity to an Industrial Technology

Segal

2020

Metals

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This paper presents a state-of-the-art and a retrospective view of the critical stages in the evolution of equal-channel angular extrusion (ECAE) from the original idea to a cost-effective industrial technology. These stages include optimization of the structure modification and material processing, development of the special tools, process commercialization, and a large-scale validation of the semi-continuous ECAE at the industrial floor. All aspects are extensively summarized, based on the author’s experience in the field, which spans almost half of a century. Special attention is paid to the processing of large batch billets. Practical examples illustrate industrial applications of ECAE. The scope for future development is also discussed.

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“…Research on metallic materials with an ultrafine-grained (UFG) structure (below~2 µm) is constantly being conducted all over the world, because they have improved mechanical and physical properties without the addition of alloying elements [1][2][3][4][5][6][7][8]. The grain size depends on processing parameters such as the deformation temperature, strain, strain rate, and cooling rate [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Through-Thickness Microstructure and Strain Distribution in Steel Sheets Rolled in a Large-Diameter Rolling Process

Inoue

Qiu

Ueji

2020

Metals

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The rolling condition for fabricating a low-carbon niobium-microalloyed steel sheet with an ultrafine-grained (UFG) structure was examined through rolling experiments and finite element analysis. A large-diameter rolling process was proposed to create a UFG structure. The rolling was conducted near the transformation point, Ar3, from austenite to ferrite. The Ar3 was measured at the surface and the center of the sheet. First, the through-thickness microstructure and equivalent strain distribution in a 1-pass rolled sheet 2.0 mm thick were examined. In the rolling experiments, the embedded pin method was employed to understand through-thickness deformation. The magnitude of the equivalent strain to obtain a UFG structure was estimated to be 2.0. Based on these results, the fabrication of a 2 mm UFG steel sheet by 3-pass rolling for an initial thickness of 14.5 mm was attempted by the proposed large-diameter rolling process.

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Semi-Continuous Equal-Channel Angular Extrusion and Rolling of AA5083 and AZ31 Alloys

Cited by 7 publications

References 17 publications

Investigation into the friction stir welding of thick section aluminium alloys

Investigation into the friction stir welding of thick section aluminium alloys

Equal-Channel Angular Extrusion (ECAE): From a Laboratory Curiosity to an Industrial Technology

Through-Thickness Microstructure and Strain Distribution in Steel Sheets Rolled in a Large-Diameter Rolling Process

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