Using SEM and EDX for a Simple Differentiation of ?‐ and ?‐AlFeSi‐Phases in Wrought Aluminum Billets

Rosefort, Marcel; Matthies, Christiane; Buck, Hinrich; Koch, Hubert

doi:10.1002/9781118061992.ch124

Cited by 3 publications

(3 citation statements)

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“…12a) 1 in the figure) between the secondary dendrite arms is b-AlFeSi phase, and that the irregular shaped particle (region 2 in the figure) in the final solidification region is a-AlFeSi phase. According to Rosefort et al [43], a-and b-AlFeSi phases in as-cast aluminum alloys can be identified using SEM-EDS, wherein the plate-like-shaped phase observed with high Si(wt%)/Fe(wt%) ratios ($0.4 and above) is b-AlFeSi, while the ''Chinese-script''-shaped phase observed with low Si(wt%)/Fe(wt%) ratios is a-AlFeSi. In the high Mg-content Al-1.5Mg-1Fe-0.5Si alloy (Fig.…”

Section: Solidification and Microstructural Characteristicsmentioning

confidence: 99%

Development and characterization of low-silicon cast aluminum alloys for thermal dissipation

Shin

Kim

2015

Journal of Alloys and Compounds

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Section: Solidification and Microstructural Characteristicsmentioning

confidence: 99%

Development and characterization of low-silicon cast aluminum alloys for thermal dissipation

Shin

Kim

2015

Journal of Alloys and Compounds

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“…Chinese script α-AlFeSi phase Figure 9: SEM micrographs illustrate the different morphology of as-cast β-AlFeSi particles and α-AlFeSi phase particles developed in reference alloys [19].…”

Section: Plate-like β-Alfesi Phasementioning

confidence: 99%

“…Fig. 9 illustrates the very different as-cast morphologies of these intermetallic particles [19]. It has been proposed that β-AlFeSi and Mg 2 Si particles in grain boundaries create a weakness in the structure due to localised melting during extrusion allowing some grains to be ripped from the surface resulting in a poor surface finish [20].…”

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confidence: 99%

The Metallurgy of Homogenisation

Rinderer

2011

MSF

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Homogenisation of aluminium alloys is the high temperature heat treatment (450-600 °C) performed after casting and consists of three distinct steps; heat-up, soak and cooldown. This review considers the metallurgical importance of homogenisation and how it impacts on the further processing and final properties of some aluminium alloys, with emphasis on homogenisation of extrusion billet. The introduction of continuous homogenisation has significantly improved the temperature uniformity of homogenisation allowing the soak time to be minimised. Batch homogenisation, however, provides flexibility in practices tailored for different aluminium alloys. Soft 6060 and 6063 alloys are best homogenised at a higher soak temperature than harder alloys such as 6061 and 6082. The homogenisation cooling rate can also impact on the behaviour of the billet during extrusion processing as well as affecting the final mechanical properties. An understanding of the microstructural changes occurring as a result of homogenisation allows the cast house to ensure that the billet processing meets the customer requirements.

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Effect of Selected Alloying Elements on Aluminium Physical Properties and its Effect on Homogenization after Casting

Knych

Mamala

Ściężor

2013

MSF

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Modern technology for near net shape aluminium alloy flat rolled products includes twin roll casting, cold rolling and heat treatment. The technology is most common for 1XXX, 3XXX and 8XXX aluminium alloys. In fact, this technology of cold forming is applied to materials with as cast structure which may in some cases limit formability during rolling. As a consequence, the fundamental operation for high quality products is a well chosen homogenization process of material after casting. During the homogenization of 8XXX alloys after twin roll casting, important changes in electrical conductivity of the material have been reported in the literature. Possibly, the observed effects are connected with the migration of alloying element atoms in the microstructure. This study presents the influence of selected alloying elements on the electrical conductivity and mechanical properties of aluminium. On this basis, it is possible to analyse the effect and level of diffusion of alloying elements from particles to matrix and from matrix to particles during homogenization of 8XXX alloys in as cast temper. Additional comparison of experimental results with theoretical considerations via Nordheim’s rule was also analyzed in this study.

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Using SEM and EDX for a Simple Differentiation of ?‐ and ?‐AlFeSi‐Phases in Wrought Aluminum Billets

Cited by 3 publications

References 1 publication

Development and characterization of low-silicon cast aluminum alloys for thermal dissipation

Development and characterization of low-silicon cast aluminum alloys for thermal dissipation

The Metallurgy of Homogenisation

Effect of Selected Alloying Elements on Aluminium Physical Properties and its Effect on Homogenization after Casting

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