Thixoextrusion of an A356 alloy: microstructural studies and high temperature fatigue behaviour

Freitas, E. de; Ferrante, M.; Silva, V.F. da; Filho, Waldek Wladimir Bose; Spinelli, Dirceu

doi:10.1016/j.jmatprotec.2004.04.314

Cited by 12 publications

(4 citation statements)

References 4 publications

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“…not possessing the appropriate microstructures, cannot be used. Several commercial aluminium alloys such as A356 and A357 (Al-Si-Mg) are used as thixoforming materials [5][6][7] . These alloys provide high fluidity and good castability.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pouring Temperature and Water Cooling on the Thixotropic Semi-solid Microstructure of A319 Aluminium Cast Alloy

et al. 2015

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Section: Introductionmentioning

confidence: 99%

Effect of Pouring Temperature and Water Cooling on the Thixotropic Semi-solid Microstructure of A319 Aluminium Cast Alloy

et al. 2015

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“…not possessing the appropriate microstructures, cannot be used. Several commercial aluminum alloys such as A356 and A357 were used as thixoforming materials [5][6][7]. These alloys provide high fluidity and good castability and usually used in fabrication automobile components.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pouring Temperature and Water Cooling on the Microstructure of Ingots Produced by Cooling Slope Casting Technique

El-Mahallawi

Mahmoud

Gaafer

et al. 2014

The International Conference on Applied Mechanics and Mechanica

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The cooling slope (CS) casting is the simplest and cheapest technique for producing feedstock materials with non-dendritic microstructure required for semi-solid metal (SSM) processing methods such as thixoforming. In the present investigation, the effect of the pouring temperature and the water cooling on the thixotropic microstructure of commercial A319 Al-Si cast alloy was studied. The results showed that increasing the pouring temperature slightly reduces the bulk porosity of the CS ingots. The ingots poured with water-cooling exhibited slightly lower porosity content than those poured with without water-cooling. Generally, it has been found that the primary α-Al grains have generally higher shape factor near the edge of ingot than the middle and center. Ingots poured with water-cooling exhibited lower grain size and shape factor than those poured without water-cooling. Increasing the pouring temperature increases the size α-Al grains. Ingots poured with water-cooling exhibited higher hardness values than those poured without water-cooling.

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“…[5][6][7][8][9][10][11][12][13] Thixoextrusion has also attracted some attention. [14][15][16][17][18] The key feature that permits the thixoextrusion of aluminium alloys is, once again, a globular microstructure, which may be handled like a solid but flows readily when sheared. 17 The extrudability of such a material is exceptional owing to the liquid phase between the globular grains.…”

Section: Introductionmentioning

confidence: 99%

“…[14][15][16][17][18] The key feature that permits the thixoextrusion of aluminium alloys is, once again, a globular microstructure, which may be handled like a solid but flows readily when sheared. 17 The extrudability of such a material is exceptional owing to the liquid phase between the globular grains. 19,20 However, extrusion in the semisolid state is a relatively challenging manufacturing route with respect to other semisolid forming operations owing to the configuration of the forming tool and the nature of the forming process.…”

Section: Introductionmentioning

confidence: 99%

Extrusion of EN AW-2014 alloy in semisolid state

Birol

Güven

Çapan

2011

Materials Science and Technology

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The potential of forming EN AW-2014 alloy in semisolid state was investigated. The EN AW-2014 slugs were partially melted at 610°C, to a liquid fraction of ∼15, before they were extruded into a solid bar with a diameter of 16 mm. The ram speed used in this process was much lower than that employed in thixoforging of the same alloy to maximise heat removal from the slug and to fully solidify the liquid fraction by the time the extruded bar exits the die. The high solid fraction employed was also of help in this regard. Forming during extrusion under these conditions took place largely via rotation of the α-Al globules over one another, producing a remarkable microstructure of predominantly uniform globular α-Al grains. The forming load was at least an order of magnitude smaller with respect to that measured during hot extrusion of the same alloy, underlining the benefits of extruding the hard to form 2XXX alloys in semisolid state. Having been largely drained of its liquid, the final part of the preheated slug, however, failed to enjoy extrusion under such favourable conditions. The large extrusion deformation and temperatures well above the liquidus point have led to dynamic recrystallisation, which is responsible for the equiaxed, instead of fibrous, grain structure in this region.

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Thixoextrusion of an A356 alloy: microstructural studies and high temperature fatigue behaviour

Cited by 12 publications

References 4 publications

Effect of Pouring Temperature and Water Cooling on the Thixotropic Semi-solid Microstructure of A319 Aluminium Cast Alloy

Effect of Pouring Temperature and Water Cooling on the Thixotropic Semi-solid Microstructure of A319 Aluminium Cast Alloy

Effect of Pouring Temperature and Water Cooling on the Microstructure of Ingots Produced by Cooling Slope Casting Technique

Extrusion of EN AW-2014 alloy in semisolid state

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