Changes in Grain Size Distribution of a Submicron Grained Al-Sc Alloy during High Temperature Annealing


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Severe plastic straining is an established method for producing submicron grain (SMG) structures in alloys. However, the development of such a fine grained structure in single-phase alloys is usually futile if they are to be exposed or processed at elevated temperatures. This is a direct consequence of the natural tendency for rapid and substantial grain coarsening which completely removes the benefits obtained by grain refinement. This problem may be avoided by the introduction of nanosized, highly stable particles in the metal matrix. In this work, a SMG structure was generated in an Al-0.3 wt.% Sc alloy by Equal Channel Angular Pressing (ECAP). The alloy was prepared initially to produce a fine grained microstructure exhibiting a large fraction of high angle grain boundaries and a dispersion of nanosized Al3Sc particles. The evolution of microstructure during annealing at temperatures up to 550 °C was examined in detail and grain size distributions generated from the data. It was shown that grain coarsening is rapid at temperatures above 450 °C and the initial log-normal grain size distribution exhibiting low variance and skewness was altered considerably. The statistical information generated from the grain size distributions confirms that discontinuous grain coarsening occurs in this alloy only at temperatures greater than 500 °C.



Materials Science Forum (Volumes 519-521)

Edited by:

W.J. Poole, M.A. Wells and D.J. Lloyd




N. Burhan and M. Ferry, "Changes in Grain Size Distribution of a Submicron Grained Al-Sc Alloy during High Temperature Annealing", Materials Science Forum, Vols. 519-521, pp. 1617-1622, 2006

Online since:

July 2006




[1] Humphreys FJ, Prangnell PB, Bowen JR, Gholinia A, Harris C. Phil Trans Royal Society A 1999; 357; 1663.

[2] Valiev RZ, Islamgaliev RK, Alexandrov IV. Prog Mater Sci 2000; 45; 103.

[3] Ferry M, Hamilton NE, Humphreys FJ. Acta Mater 2005; 53; 1097.

[4] Ferry M. Acta Mater 2005; 53; 773.

[5] Driver JH. Scripta Mater 2004; 51; 819.

[6] Humphreys FJ, Hatherly M. Recrystallization and Related Annealing Phenomena, 2nd edition. Pergamon Press, Oxford, UK; (2004).

[7] Furukawa M, Horita Z, Nemoto Z, Valiev RZ, Langdon TG. Acta Mater 1996; 44; 4619.

[8] Morris DG, Munoz-Morris MA. Acta Mater 2002; 50; 4047.

[9] Horita Z, Fujinami T, Nemoto M, Langdon TG. J Mater Proc Tech 2001; 117; 288.

[10] Cao WQ, Godfrey A, Liu W, Liu Q. J Mater Lett 2003; 57; 3767.

[11] Yu CY, Sun PL, Kao PL, Chang CP. Mat Sci Eng A 2004; 366; 310.

[12] Manohar PA, Ferry M, Chandra T. ISIJ International 1998; 38; 913.

[13] Furukawa M, Iwahishi Y, Horita Z, Nemoto M, Langdon TG. Mater Sci Eng A 1998; 257; 328.

[14] Jones MJ, Humphreys FJ. Acta Mater 2003; 51; 2149.

[15] Ferry M, Humphreys FJ. Acta Mater 1996; 44; 1293.

[16] Huang Y, Humphreys FJ, Ferry M. Acta Mater 2000; 48; 2543.

[17] Humphreys FJ. J Mat Sci 2001; 36; 3833.

[18] Burhan N. PhD Thesis. University of New South Wales; (2006).

[19] Chan HM, Humphreys FJ. Acta Metall 1984; 32; 235.

[20] Ferry M, Humphreys FJ. Acta Mater 1996; 44; 3089.

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