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GPL Ghostscript 9.07; modified using iText 4.2.0 by 1T3XT
Aluminum alloys; Computational thermodynamics; Microsegregation; Alloy design
2014-12-10T04:04:23-08:00
2014-12-02T14:01:36+01:00
Speedflow Check Version 3.1 (SR 1)
2014-12-10T04:04:23-08:00
uuid:d8aede94-7c7e-11e4-0000-478fadc7da71
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application/pdf
Phase fraction mapping in the as-cast microstructure of extrudable 6xxx aluminum alloys
Panagiota I. Sarafoglou, Gregory N. Haidemenopoulos
The mapping of Mg 2 Si and β-AlFeSi phase fractions in the as-cast microstructure of Al – Mg – Si – Fe – Mn (6xxx series) alloys has been performed over the useful composition range (0 – 1.2 mass%) of the principal alloying elements Mg and Si. The calculations were based on the Scheil–Gulliver assumption of infinite diffusion in the liquid and limited diffusion in the solid state. The computed phase fractions were validated with experimental measurements of phase fractions. The mapping procedure allows the control of intermetallic phases in the as-cast microstructure, the minimization of the β-AlFeSi phase in particular, which is a significant prerequisite in obtaining enhanced extrudability, combined with high strength in this alloy series. Construction of maps for different levels of Mn has shown that addition of Mn could allow for higher alloying with Mg and Si, in order to obtain higher amounts of Mg 2 Si, without at the same time increasing the β-AlFeSi phase in the as-cast microstructure.
Aluminum alloys
Computational thermodynamics
Microsegregation
Alloy design
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