Mechanism of Grain Refinement in Aluminium in the Process of Hydrostatic Extrusion

Abstract:

Technically pure aluminium was subjected to three passes by the process of hydrostatic extrusion (HE) to a true strain of 3.8. TEM observations of the microstructure revealed that the first pass of the process refined the grains to 0.6 μm, but the mean grain size remains unaffected by further strain. The microstructural evolution over the strain range from 1 to 4 proceeds through the recovery of grain interiors. Significant changes have been found in grain boundary characteristics. The fraction of high angle grain boundaries profoundly increases as the true strain increases. Various mechanisms for their formation and their relevance to HE are discussed

• Periodical: Solid State Phenomena (Volume 114)
• Pages: 109-116
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.114.109
• Online since: July 2006
• Authors: Małgorzata Lewandowska
• Keywords: Aluminum (Al), Grain Refinement, Hydrostatic Extrusion (HE)

References

[1] Y. Iwahashi, Z. Horita, M. Nemoto, T.G. Langdon: Acta mater 46 (1998), p.3317.

[2] A.P. Zhilayaev, B. -K. Kim, G.V. Nurislamova, M.D. Baro, J.A. Szpunar, T.G. Langdon: Scripta mater. 46 (2002), p.575.

[3] M. Richert, Q. Liu, N. Hansen: Mat. Sci. Eng. A260 (1999), p.275.

[4] N. Tsuji, Y. Ito, Y. Saito, Y. Minamino: Scripta mater. 47 (2002), p.893.

[5] R.Z. Valiev, R.K. Islamgaliev, I.V. Alexandrov: Progress in Mat. Sci. 45 (2000), p.103.

[6] M. Furukawa, Z. Horita, M. Nemoto, T.G. Langdon: Mat. Sci. Eng. A324 (2002), p.82.

[7] P.B. Prangnell, J.R. Bowen, P.J. Apps: Mat. Sci. Eng. A375-377 (2004), p.178.

[8] M.A. Munos-Morris, C. Garcia Oca, D.G. Morris: Scripta mater. 48 (2003), p.213.

[9] A.P. Zhilayaev, B. -K. Kim, G.V. Nurislamova, M.D. Baro, J.A. Szpunar, T.G. Langdon: Scripta mater 46 (2002), p.575.

[10] T. Hebesberger, H.P. Stuwe, A. Vorhauer, F. Wetscher, R. Pippan: Acta mater. 53 (2005), p.393.

DOI: 10.1016/j.actamat.2004.09.043

[11] K. Muller at al. Fundamentals of Extrusion Technology (Giesel Verlag, Germany 2004).

[12] M. Lewandowska, H. Garbacz, W. Pachla, A. Mazur, K.J. Kurzydłowski: Solid State Phenomena, 101 (2005), p.65.

[13] M. Lewandowska, H. Garbacz, W. Pachla, A. Mazur, K.J. Kurzydłowski: Materials Science - Poland 23 (2005), pp.279-286.

[14] B. Adamczyk-Cieślak, J. Mizera, M. Lewandowska, K.J. Kurzydłowski: Rev. Adv. Mater. Sci. 8 (2004), p.107.

[15] C.Y. Barlow, P. Nielsen, N. Hansen: Acta mater. 52 (2004), p.3967.

[16] Q. Liu, X. Huang, D.J. Lloyd, N. Hansen: Acta mater. 50 (2002), p.3789.

[17] O.V. Mishin, D. Juul Jensen, N. Hansen: Mat. Sci. Eng. A342 (2003), p.320.

[18] Y. Saito, H. Utsunomiya, N. Tsuji, T. Sakai: Acta mater. 47 (1999), p.579.

[19] K.J. Kurzydlowski, B. Ralph: Quantitative Description of Microstructure of Materials. CRC Press, Boca Raton; (1995).

[20] K.J. Kurzydłowski: Mat. Sci. Forum 503-504 (2006), pp.341-348.