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Analysis of Different Solution Treatments in the Transformation of β-AlFeSi Particles into α-(FeMn)Si and Their Influence on Different Ageing Treatments in Al–Mg–Si Alloys

Materials Pro Group, Department of Materials Science and Metallurgical Engineering, University of Oviedo, Independencia 13, 33004 Oviedo, Spain
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Metals 2020, 10(5), 620; https://doi.org/10.3390/met10050620
Received: 7 April 2020 / Revised: 28 April 2020 / Accepted: 7 May 2020 / Published: 10 May 2020
(This article belongs to the Special Issue Casting and Solidification of Light Alloys)
In the as-cast state, Al–Mg–Si alloys are not suitable for hot forming. They present low ductility due to the presence of intermetallic β-AlFeSi particles that form in the interdendritic regions during the solidification process. Homogenization treatments promote the transformation of these particles into α-(FeMn)Si particles, which are smaller in size and more rounded in shape, thus improving the ductility of the material. This paper analyses the influence of various solution treatments on the transformation of β-AlFeSi particles into α-(FeMn)Si particles in an Al 6063 alloy. Their effect on different ageing treatments in the 150–180 °C temperature range is also studied. An increase in the solution temperature favours greater transformation of the β-AlFeSi particles into α-(FeMn)Si, dissolving a greater amount of Si, thereby having a significant effect on subsequent ageing. We found that as the dwell time at a temperature of 600 °C increases, the rate of dissolution of the Fe atoms from α-(FeMn)Si particles exceeds the rate of incorporation of Mn atoms into said particles. This seems to produce a delay in reaching the peak hardness values in ageing treatments, which warrants further research to model this behaviour. The optimal solution treatment takes place at around 600 °C and the highest obtained peak hardness value is 104 HV after a 2 h solution treatment at said temperature and ageing at 160 °C for 12 h. View Full-Text
Keywords: Al–Mg–Si; α-Al8(Fe2Mn)Si particles; solution treatment; ageing; dissolution of Fe; Differential Scanning Calorimetry Al–Mg–Si; α-Al8(Fe2Mn)Si particles; solution treatment; ageing; dissolution of Fe; Differential Scanning Calorimetry
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Alvarez-Antolin, F.; Asensio-Lozano, J.; Cofiño-Villar, A.; Gonzalez-Pociño, A. Analysis of Different Solution Treatments in the Transformation of β-AlFeSi Particles into α-(FeMn)Si and Their Influence on Different Ageing Treatments in Al–Mg–Si Alloys. Metals 2020, 10, 620.

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