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Homogeneous nucleation kinetics of Al3Sc in a dilute Al-Sc alloy

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Abstract

The homogeneous nucleation kinetics of the L12 A13Sc phase in the face-centered cubic (fcc) matrix of an A1-0.11 at. pct Sc alloy were measured at 561 and 616 K using the isothermal transformation technique and transmission electron microscopy (TEM). Applying classical homogeneous nucleation theory in conjunction with available thermodynamic data, an average interphase boundary energy of about 94 ±23 mJ/m2 was estimated from the nucleation rate data. This energy was found to vary weakly with temperature. The effects of heat-treatment technique (isothermal transformationvs quench and age) on nucleation kinetics indicate that quenched-in vacancies may influence nucleation kinetics primarily by increasing the interdiffusion of Sc in Al.

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Authors and Affiliations

  1. Alloy Technology Division, ALCOA Technical Center, LCOA Center, 15069-0001, PA

    R. W. Hyland (Senior Scientist)

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  1. R. W. Hyland
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This paper is based on a presentation made in the “G. Marshall Pound Memorial Symposium on the Kinetics of Phase Transformations” presented as part of the 1990 fall meeting of TMS, October 8–12, 1990, in Detroit, MI, under the auspices of the ASM/MSD Phase Transformations Committee.

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Hyland, R.W. Homogeneous nucleation kinetics of Al3Sc in a dilute Al-Sc alloy. Metall Trans A 23, 1947–1955 (1992). https://doi.org/10.1007/BF02647542

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