Spatial Uniformity of the Rate of Grain Coarsening in a Submicron Al-Sc Alloy Produced by Severe Plastic Deformation

Abstract:

The uniformity of grain coarsening throughout the microstructure of a submicron grained particle-containing aluminium alloy has been investigated using high resolution EBSD. The alloy was processed by equal channel angular pressing (ECAP) and low temperature ageing to generate ~0.8 􀁐m diameter grain structure containing a relatively uniform dispersion of nanosized Al3Sc particles. While the initial processing route generated a uniform grain size distribution, the distribution of grain orientations was rather inhomogeneous with certain regions of microstructure containing colonies of grains consisting predominantly of either HAGBs or LAGBs. It was found that, despite the difference in grain boundary character between these regions, the fine particles produced by pre-ageing promote uniform coarsening throughout the microstructure despite the marked differences in boundary character between these regions. An analytical model is outlined which predicts the uniformity of grain coarsening in particle-containing alloys despite the presence of orientation gradients in the microstructure.

• Periodical: Materials Science Forum (Volumes 503-504)
• Pages: 251-258
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.503-504.251
• Online since: January 2006
• Authors: Michael Ferry
• Keywords: Aluminum (Al), Annealing, Deformed Microstructure, Electron Backscatter Diffraction (EBSD), Grain Stability

References

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

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

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

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

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

[6] Humphreys FJ. Acta Mater 1997; 45; 4231.

[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] Hallem H, Forbord B, Marthinsen K, Proc. ICAA-9, eds. J.F. Nie et al. Brisbane, Australia; 2005; 240.

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

[14] Lee S, Utsunomiya A, Akamatsu H, Neishi K, Furukawa M, Horita Z, Langdon TG. Acta Mater 2002; 40; 553.

[15] Ferry M, Hamilton NE, Humphreys FJ. Acta Mater, 2005; 53; 1109.

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

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

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

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

[20] Bowen JR, Prangnell PB, Humphreys FJ. Mater Sci Tech 2000; 16; 1246.

[21] McKenzie JK. Biometrica 1958; 45; 229.

[22] Bowen JR, Mishin OV, Prangnell PB Juul Jensen D. Scripta Mater 2002; 47; 289.

DOI: 10.1016/s1359-6462(02)00109-4

[23] Horita Z, Furukawa M, Nemoto M, Barnes AJ, Langdon TG. Acta Mater 2000; 48; 3633.

[24] Orsund R, Hjelen J, Nes E. Scripta Metall 1989; 23; 1193.

[25] Read WT, Shockley W. Phys Rev 1950; 78; 275.

[26] Smith CS (private communication with C. Zener). Trans AIME 1948; 175; 15.

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

[28] Humphreys FJ. Acta Mater 1997; 45; 5031.