Abstract
This study examines the influence of microstructural parameters (grain and dispersoid size, vacancy content) and some test parameters (strain rate, protective oxide coatings, air and water vapour excluding films, and surface geometrical quality) on the tensile behaviour (yield stress, work hardening rate, tensile stress, ductility) of a mechanically-alloyed, fine-grained Fe-40Al intermetallic. Major changes of strength and ductility are obtained by changing grain size (1% and 10% for grain sizes of 100µm and 1µm) and by avoiding premature stress/strain concentrators (ductility increased from 5% to 10% for imperfectly machined to prepolished samples). Ductility variations are interpreted using a slow-crack-propagation-to-instability model, where the roles of environment, surface state, deformation processes, and fracture mechanisms can be distinguished.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
C.G. McKamey, J.H. CeVan, P.F. Tortorelli and V.K. Sikka, J. Mater. Res. 6, 1779 (1991).
C.T. Liu, E.H. Lee and C.G. McKamey, Scripta Metall. 23, 875 (1989).
C.T. Liu and E.P. George, Scripta Metall. 24, 1285 (1990).
M.A. Crimp, K.M. Vedula and D.J. Gaydosh, in High Temperature Ordered Intermetallic Alloys II, Vol. 81, eds. N.S. Stoloff, C.C. Koch, C.T. Liu and O. Izumi, p. 499, MRS Symposium Proceedings, Pittsburgh, PA, 1987.
P. Nagpal and I. Baker, Mater. Char. 27, 167 (1991).
D.J. Gaydosh, S.L. Draper, R.D. Noebe and M.V. Nathal, Mater. Sci. Eng. A150, 7 (1992).
P. Nagpal and I. Baker, Scripta Metall. Mater. 25, 2577 (1991).
I. Baker, O. Klein, C. Nelson and E.P. George, Scripta Metall. Mater. 30, 863 (1994).
L.M. Pike and C.T. Liu, Scripta Mater. 38, 1475 (1998).
M.A. Crimp and K.M. Vedula, Mater. Sci. Eng. 78, 193 (1986).
D.V. Gaydosh, S.L. Draper and M.V. Nathal, Metall. Trans. 20A, 1701 (1989).
I. Baker and P. Munroe, Int. Mater. Rev. 42, 181 (1997).
R. Baccino, D. San Filippo, F. Moret, A. Lefort and G. Webb, Proc. PM'94, Powder Metallurgy World Congress, Paris, June 1994, Vol. II, Editions de Physique, Les Ulis, 1994, p. 1239.
D.G. Morris and S. Gunther, Mater. Sci. and Eng. A208, 7 (1996).
D.G. Morris, S. Gunther and C. Briguet, Scripta Mater. 37, 71 (1997).
M.A. Montealegre, J.L. Gonzalez-Carrasco, M.A. Morris-Muñoz, J. Chao and D.G. Morris, Intermetallics 8, 439 (2000).
J. Chao, M.A. Muñoz-Morris, J.L. Gonzalez-Carrasco and D.G. Morris, submitted to Intermetallics.
D.B. Kasul and L.A. Heldt, Metall. and Mater. Trans. 25A, 1285 (1994).
J.H. Schneibel and M.G. Jenkins, Scripta Metall. Mater. 28, 389 (1993).
A. Tonneau, Ph. D. Thesis, University of Poitiers, 20th Oct. 1999.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Chao, J., Muñoz-Morris, M., Gonzalez-Carrasco, J. et al. The Influence of some Microstructural and Test Parameters on the Tensile Stress and Ductility Behaviour of a MA FeAl Intermetallic. MRS Online Proceedings Library 646, 1–6 (2000). https://doi.org/10.1557/PROC-646-N5.2.1
Published:
Issue Date:
DOI: https://doi.org/10.1557/PROC-646-N5.2.1