Hostname: page-component-586b7cd67f-gb8f7 Total loading time: 0 Render date: 2024-11-27T03:42:55.015Z Has data issue: false hasContentIssue false
  • English
  • Français

Development of a submicrometer-grained microstructure in aluminum 6061 using equal channel angular extrusion

Published online by Cambridge University Press:  31 January 2011

Stephane Ferrasse ,
Vladimir M. Segal ,
K. Theodore Hartwig  and
Ramon E. Goforth
Stephane Ferrasse
Affiliation:
Mechanical Engineering Department, Texas A&M University, College Station, Texas 77843-3123
Vladimir M. Segal
Affiliation:
Mechanical Engineering Department, Texas A&M University, College Station, Texas 77843-3123
K. Theodore Hartwig
Affiliation:
Mechanical Engineering Department, Texas A&M University, College Station, Texas 77843-3123
Ramon E. Goforth
Affiliation:
Mechanical Engineering Department, Texas A&M University, College Station, Texas 77843-3123
Get access

Abstract

Submicrometer-grained (SMG) microstructures are produced in an Al–Mg–Si alloy (6061) by subjecting peak-aged and overaged billets of the alloy to intense plastic strain by a process known as equal channel angular extrusion. Two types of refined structure are distinguished by optical and transmission electron microscopy. One structure is created through intense deformation (four extrusion passes through a 90° die, ε = 4.62) by dynamic rotational recrystallization and is a well-formed grain (fragmented) structure with a mean fragment or grain size of 0.2–0.4 μm. The other structure is produced by post-extrusion annealing through static migration recrystallization, resulting in a grain size of 5–15 μm. Intense deformation of peak-aged material to a true strain ε of 4.62 (four passes) produces a strong, ductile, uniform, fine, and high angle grain boundary microstructure with increased stability against static recrystallization as compared to the overaged material.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 5 , May 1997 , pp. 1253 - 1261
Copyright
Copyright © Materials Research Society 1997

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1.Valiev, R. Z., Kornikov, A. V., and Mulyokov, R. R., Mater. Sci. Eng. A168, 141 (1993).CrossRefGoogle Scholar
2.Saunders, I. and Nutting, J., Metall. Sci. 18, 571 (1984).CrossRefGoogle Scholar
3.Zughaer, H. J. and Nutting, J., Mater. Sci. Technol. 8, 1104 (1992).CrossRefGoogle Scholar
4.Wert, J. A. and Austin, L. K., Metall. Trans. A19, 617 (1988).CrossRefGoogle Scholar
5.Wert, J. A., Paton, N. E., Hamilton, C. H., and Mahoney, M. W., Metall. Trans. A12, 1267 (1981).CrossRefGoogle Scholar
6.Pilling, J. and Ridley, N., Superplasticity in Crystalline Solids (The Institute of Metals, London, 1989).Google Scholar
7.Segal, V. M., Invention Certificate of the USSR, No. 575892, 1977.Google Scholar
8.Segal, V. M., Reznikov, V. I., Drobyshevkiy, A. E., and Kopylov, V. I., Russian Metall. (English Translation), 1, 99 (1981).Google Scholar
9.Segal, V. M., Proc. 5th Int. Aluminum Extrusion Technology Seminar (1992), Vol. 2, p. 403.Google Scholar
10.Segal, V. M., Proceedings of the First International Conference on Processing Material for Properties (TMS, Warrendale, PA, 1993), p. 947.Google Scholar
11.Bay, B., Hansen, N., Hughes, D. A., and Kulmann-Wilsdorf, D., Acta Metall. Mater. 40 (3), 205 (1992).CrossRefGoogle Scholar
12.Lyttle, M. T. and Wert, J. A., J. Mater. Sci. 29, 3342 (1994).CrossRefGoogle Scholar
13.Gudmunsson, H., Brooks, D., and Wert, J. A., Acta Metall. 39, 19 (1991).CrossRefGoogle Scholar
14.Segal, V. M., Goforth, R. E., and Hartwig, K. T., United States Patent No. 5 400 633, Mar. 28, 1995.Google Scholar
15.Segal, V. M., Goforth, R. E., and Hartwig, K. T., Proceedings of the First International Conference on Processing Materials for Properties (TMS, Warrendale, PA, 1993), p. 971.Google Scholar
16.Ferrasse, S., “Grain Refinement Using Equal Channel Angular Extrusion In Bulk Sections of Copper 101 and Aluminum Alloys 3003 and 6061,” Masters Thesis, Texas A&M University, May 1995.Google Scholar
17.Goforth, R. E., Segal, V. M., Hartwig, K.T., and Ferrasse, S., Superplasticity and Superplastic Forming, Edited by Ghosh, A. and Bieler, T. (TMS, Warrendale, PA, 1995), p. 25.Google Scholar
18.Wert, M. A., Treatise on Mat. Sci. and Tech. 31, 137 (1989).Google Scholar
19.Nes, E., Acta Metall. 24, 391 (1976).CrossRefGoogle Scholar
20.Hornbogen, E., Fundamental Aspects of Structural Alloy Design (Plenum Press, New York, 1977).Google Scholar
21.Sandstrom, R., Z. Metallk. 11, 741 (1980).Google Scholar