Extrusion of Aluminium Alloys

Sheppard, T.

doi:10.1007/978-1-4757-3001-2

Cited by 205 publications

(223 citation statements)

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“…The extrusion ratio was 30 (i.e. a strain of 3.4) and formulae given in 9) were used to estimate the temperature and strain rate in the deformation zone. The grain sizes shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Quenched and Annealed Microstructures of Hot Worked Magnesium AZ31

Barnett

2003

Mater. Trans.

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The microstructures of magnesium AZ31 are examined following hot compression testing and annealing. The grain size, fraction dynamically recrystallized and, in a couple of cases, the crystallographic texture are reported. The progress of dynamic recrystallization and the recrystallized grain size were sensitive to processing conditions, as expected. This effect was more marked in the former than in the latter, compared to other metals. It was also found that, for structures containing between 80 and 95% dynamic recrystallization, abnormal grain growth occurred during annealing. Irrespective of the whether or not abnormal grain growth occurred, the annealing step weakened the crystallographic texture.

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“…The extrusion ratio was 30 (i.e. a strain of 3.4) and formulae given in 9) were used to estimate the temperature and strain rate in the deformation zone. The grain sizes shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Quenched and Annealed Microstructures of Hot Worked Magnesium AZ31

Barnett

2003

Mater. Trans.

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“…Subsequent to the upsetting process an extrusion is applied where the length of the specimen increases at the expense of the cross sectional area. It is also well known that in the extrusion process grains are elongated in the direction of the extrusion process in line with the flow of the material [14]. Such an upsetting and extrusion processes are repeated several times depending on how much strain is intended to be applied.…”

Section: Rue Processmentioning

confidence: 99%

Nano grain refinement and strengthening of copper under room temperature RUE process

Aghaie-Khafri

Anijdan²,

Meraj

2017

Scientia Iranica

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In this investigation repetitive upsetting-extrusion (RUE) process was used to investigate the effect of severe plastic deformation on the microstructural changes and flow behavior of commercial pure copper. Initial material together with two passes, four passes and eight passes of RUE in annealed and non-annealed condition were studied. Results show that grain refinement, in the scale of nano meter, has mostly been achieved only after two passes of RUE which is essentially a combination of one upsetting and one extrusion path. Increasing the number of passes after four passes of RUE did not have discernible effect on the grain refinement. Such a behavior is explained to be due to saturation of dislocations and the formation of high angle grain boundaries after only two passes of RUE. The grains after eight passes of RUE process even became slightly larger than the two and the four passes of RUE. This was related to restoration phenomena occurring during high number of passes of RUE. Flow strength of the material after different passes substantially increased, though the rate at which the flow stress increased declined by increasing the number of passes. ETMB model were used to explain the deformation behavior of the RUE samples.

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“…Their mechanical properties are then adjusted by a subsequent heat treatment since the alloying elements Mg and Si enable an effective precipitation hardening the low flow stress at elevated temperatures allows for high extrusion ratios (ratio of cross sectional area of the billet versus the extrudate) as well as pressing speeds. For processing of the AA6060 aluminum alloy, which has a very high formability, and therefore is one of the most commonly used aluminum alloys, the homogenized billets are typically extruded at temperatures between 400 and 500 • C, followed by water or air quenching [1]. Enhancing the strength of the extruded semi-products by artificial aging at 160 to 180 • C takes up several hours.…”

Section: Introductionmentioning

confidence: 99%

Influence of Extrusion Temperature on the Aging Behavior and Mechanical Properties of an AA6060 Aluminum Alloy

Berndt

Frint

Wagner

2018

Metals

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Processing of AA6060 aluminum alloys for semi-products usually includes hot extrusion with subsequent artificial aging for several hours. Processing below the recrystallization temperature allows for an increased strength at a significantly reduced annealing time by combining strain hardening and precipitation hardening. In this study, we investigate the potential of cold and warm extrusion as alternative processing routes for high strength aluminum semi-products. Cast billets of the age hardening aluminum alloy AA6060 were solution annealed and then extruded at room temperature, 120 or 170 • C, followed by an aging treatment. Electron microscopy and mechanical testing were performed on the as-extruded as well as the annealed materials to characterize the resulting microstructural features and mechanical properties. All of the extruded profiles exhibit similar, strongly graded microstructures. The strain gradients and the varying extrusion temperatures lead to different stages of dynamic precipitation in the as-extruded materials, which significantly alter the subsequent aging behavior and mechanical properties. The experimental results demonstrate that extrusion below recrystallization temperature allows for high strength at a massively reduced aging time due to dynamic precipitation and/or accelerated precipitation kinetics. The highest strength and ductility were achieved by extrusion at 120 • C and subsequent short-time aging.

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Extrusion of Aluminium Alloys

Cited by 205 publications

References 0 publications

Quenched and Annealed Microstructures of Hot Worked Magnesium AZ31

Quenched and Annealed Microstructures of Hot Worked Magnesium AZ31

Nano grain refinement and strengthening of copper under room temperature RUE process

Influence of Extrusion Temperature on the Aging Behavior and Mechanical Properties of an AA6060 Aluminum Alloy

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