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.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
R. Kossowsky, J. Mater. Sci. Lett. 8, 1603 (1973).
K. Nuttal and D.P. Thompson, J. Mater. Sci. Lett. 9, 850 (1974).
J.E. Weston, J. Mater. Sci. 15, 1568 (1980).
F. Lee and K.J. Bowman, J. Am. Ceram. Soc. 75, 1748 (1992).
X. Wu and I-W. Chen, J. Am. Ceram. Soc. 75, 2733 (1992).
F. Lee and M.S. Sandlin, and K.J. Bowman, J. Am. Ceram. Soc. 76, 1793 (1993).
N. Kondo, Y. Suzuki, and T. Ohji, J. Am. Ceram. Soc. 82, 1067 (1999).
M. Mitomo, T. Nishimura, and H. Hirotsuru, Eur. J. Solid State Inorg. Chem. t32, 693 (1995).
M. Mitomo, H. Hirotsuru, H. Suematsu, and T. Nishimura, J. Am. Ceram. Soc. 78, 211 (1995).
G.D. Zhan, M. Mitomo, T. Nishimura, R.J. Xie, T. Sakuma, and Y. Ikuhara, J. Am. Ceram. Soc. 83, 841 (2000).
R.J. Xie, M. Mitomo, and G.D. Zhan, Acta Mater. 48, 2049 (2000).
R.J. Xie, M. Mitomo, G.D. Zhan, and H. Emoto, J. Am. Ceram. Soc. 83, 2529 (2000).
R.J. Xie, M. Mitomo, W. Kim, and Y.W. Kim, J. Am. Ceram. Soc. 83, 3147 (2000).
M. Dahms and H.J. Bunge, J. Appl. Crystallogr. 22, 439 (1989).
F. Lee and K.J. Bowman, J. Am. Ceram. Soc. 77, 947 (1994).
S.L. Huang and I-W. Chen, J. Am. Ceram. Soc. 77, 2575 (1994).
G.D. Zhan, M. Mitomo, Y. Ikuhara, and T. Sakuma, J. Am. Ceram. Soc. 83, 3179 (2000).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Oh-ishi, K., Horita, Z., Smith, D.J. et al. Grain boundary structure in Al–Mg and Al–Mg–Sc alloys after equal-channel angular pressing. Journal of Materials Research 16, 583–589 (2001). https://doi.org/10.1557/JMR.2001.0084
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1557/JMR.2001.0084