Experimental Analysis of Partition Coefficient in Al-Mg Alloys

سال انتشار: 1393
محل انتشار: سومین کنفرانس بین‌المللی آلومینیوم ایران IIAC2014
کد COI اختصاصی: IIAC03_067
زبان مقاله: انگلیسی
تعداد مشاهده: 528

نویسندگان

Department of Materials Science and Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, P.O. Box: 91775-1111, Iran

m Haddad-Sabzevar

Department of Materials Science and Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, P.O. Box: 91775-1111, Iran

h Fredriksson

Department of Materials Science and Engineering, Royal Institute of Technology (KTH), Brinellvägen 23, 100 44 Stockholm, Sweden

چکیده

As the partition coefficient is one of the most important parameters affecting microsegregation, the aim of this research is to experimentally analyse the partition coefficient in Al-Mg alloys. In order to experimentally measure the partition coefficient, a series of quenching experiments during solidification were carried out. For this purpose binary Al-Mg alloys containing 6.7 and 10.2 wt-% Mg were melted and solidified in a DTA furnace capable of quenching samples during solidification. Cooling rates of 0.5 and 5 K/min were used and samples were quenched from predetermined temperatures during solidification. The fractions and compositions of the phases were measured by quantitative metallography and SEM/EDX analyses, respectively. These results were used to measure the experimental partition coefficients. The resultant partition coefficients were used to model the concentration profile in the primary phase and the results were compared with equilibrium calculations and experimental profiles. The results of calculations based on the experimental partition coefficients show better consistency with experimental concentrationprofiles than the equilibrium calculations

کلیدواژه ها

Partition Coefficient; Microsegregation; Al-Mg Alloys; Differential Thermal Analysis

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