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Grain boundary structure in Al–Mg and Al–Mg–Sc alloys after equal-channel angular pressing

Published online by Cambridge University Press:  31 January 2011

Keiichiro Oh-ishi ,
Zenji Horita ,
David J. Smith  and
Terence G. Langdon
Keiichiro Oh-ishi
Affiliation:
Department of Materials Science and Engineering, Kyushu University, Fukuoka 812–8581, Japan
Zenji Horita
Affiliation:
Department of Materials Science and Engineering, Kyushu University, Fukuoka 812–8581, Japan
David J. Smith
Affiliation:
Center for Solid State Science and Department of Physics and Astronomy, Arizona State University, Tempe, Arizona 85287–1504
Terence G. Langdon
Affiliation:
Departments of Materials Science and Mechanical Engineering, University of Southern California, Los Angeles, California 90089–1453
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Abstract

Samples of an Al–3% Mg alloy and an Al–3% Mg–0.2% Sc alloy were subjected to equal-channel angular pressing (ECAP) to reduce the grain size to approximately 0.2–0.3 μm. Some samples of each alloy were also annealed for 1 h at temperatures of either 423 or 673 K, respectively. High-resolution electron microscopy was used to examine the microstructure both before and after annealing. The grain boundaries after ECAP were wavy and faceted and in high-energy nonequilibrium configurations. These results were consistent with earlier observations of materials subjected to severe plastic deformation using high-pressure torsion. In addition, some grain boundaries in the Al–Mg–Sc alloy had a zigzag appearance after annealing at 673 K, where the straight portions of the boundary were identified as low-energy {111} planes. It is suggested these are mobile boundaries lying in a lowest energy configuration where mobility may be restricted by the presence of incoherent Al3Sc particles.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 2 , February 2001 , pp. 583 - 589
Copyright
Copyright © Materials Research Society 2001

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References

REFERENCES

1.Valiev, R.Z., Islamgaliev, R.K., and Alexandrov, I.V., Prog. Mater. Sci. 45, 103 (2000).Google Scholar
2.Lowe, T.C. and Valiev, R.Z. (eds.), Investigations and Applications of Severe Plastic Deformation (Kluwer, Dordrecht, The Netherlands, 2000).Google Scholar
3.Humphreys, F.J., Prangnell, P.B., Bowen, J.R., Gholinia, A., and Harris, C., Philos. Trans. R. Soc. London, Ser. A 357, 1663 (1999).Google Scholar
4.Richert, J. and Richert, M., Aluminium 62, 604 (1986).Google Scholar
5.Lowe, T.C. and Valiev, R.Z., JOM 52 (4), 27 (2000).Google Scholar
6.Horita, Z., Smith, D.J., Furukawa, M., Nemoto, M., Valiev, R.Z., and Langdon, T.G., J. Mater. Res. 11, 1880 (1996).Google Scholar
7.Horita, Z., Smith, D.J., Nemoto, M., Valiev, R.Z., and Langdon, T.G., J. Mater. Res. 13, 446 (1998).CrossRefGoogle Scholar
8.Ohishi, K., Horita, Z., Smith, D.J., Valiev, R.Z., Nemoto, M., and Langdon, T.G., J. Mater. Res. 14, 4200 (1999).Google Scholar
9.Berbon, P.B., Furukawa, M., Horita, Z., Nemoto, M., Tsenev, N.K., Valiev, R.Z., and Langdon, T.G., Philos. Mag. Lett. 78, 313 (1998).Google Scholar
10.Filatov, Yu.A., Yelagin, V.I., and Zakharov, V.V., Mater. Sci. Eng. A 280, 97 (2000).CrossRefGoogle Scholar
11.Komura, S., Horita, Z., Furukawa, M., Nemoto, M., and Langdon, T.G., J. Mater. Res. 15, 2571 (2000).CrossRefGoogle Scholar
12.Iwahashi, Y., Horita, Z., Nemoto, M., and Langdon, T.G., Acta Mater. 45, 4733 (1997).CrossRefGoogle Scholar
13.Iwahashi, Y., Horita, Z., Nemoto, M., and Langdon, T.G., Acta Mater. 46, 3317 (1998).Google Scholar
14.Segal, V.M., Mater. Sci. Eng. A 197, 157 (1995).CrossRefGoogle Scholar
15.Furukawa, M., Iwahashi, Y., Horita, Z., Nemoto, M., and Langdon, T.G., Mater. Sci. Eng. A 257, 328 (1998).CrossRefGoogle Scholar
16.Segal, V.M., Mater. Sci. Eng. A 271, 322 (1999).Google Scholar
17.Langdon, T.G., Furukawa, M., Nemoto, M., and Horita, Z., JOM 52 (4), 30 (2000).Google Scholar
18.Iwahashi, Y., Wang, J., Horita, Z., Nemoto, M., and Langdon, T.G., Scripta Mater. 35, 143 (1996).CrossRefGoogle Scholar
19.Iwahashi, Y., Horita, Z., Nemoto, M., and Langdon, T.G., Metall. Mater. Trans. 29A, 2503 (1998).Google Scholar
20.Berbon, P.B., Komura, S., Utsunomiya, A., Horita, Z., Furukawa, M., Nemoto, M., and Langdon, T.G., Mater. Trans. JIM 40, 772 (1999).CrossRefGoogle Scholar
21.Ohishi, K., Horita, Z., Furukawa, M., Nemoto, M., and Langdon, T.G., Metall. Mater. Trans. 29A, 2011 (1998).CrossRefGoogle Scholar
22.Ashby, M.F. and Brown, L.M., Philos. Mag. 8, 1083 (1963).CrossRefGoogle Scholar