Abstract
In many materials, the mechanical behavior is controlled by the grain boundary (GB) properties. An extreme example is the ordered alloy Ni3Al, which, as a single crystal, is ductile, while as a pure polycrystal, exhibits severe intergranular brittleness, making it useless as a technological material. However, it has been found [1] that do** Ni3Al that is slightly Ni-rich (76% Ni) with small amounts of boron (~l-2 atomic %) restores the ductility almost to the level of the single crystal. While it is known experimentally that B segregates to grain boundaries [1], the mechanism by which ductilization occurs is not known. We present here results of our initial investigation into the effects of impurities on Ni3Al grain boundaries, using interatomic potentials of the embedded atom [2,3] form, coupled with molecular statics techniques.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
Similar content being viewed by others
References
C.T. Liu, C.L. White and J.A. Horton, Acta Metall., 33:213 (1985).
M.S. Daw and M.I. Baskes, Phys. Rev. Lett. 50:1285 (1983); Phys. Rev. B 29:6443 (1984).
A.F. Voter and S.P. Chen, Mater. Res. Soc. Svmp. Proc. Vol. 82:175 (1987).
“Grain Boundary Structure and Kinetics”, ed. by R.W. Balluffi, ASM, Metals Park, OH (1980).
A.P. Sutton, Int. Metals Rev. 29:377 (1984).
S.P. Chen, A.F. Voter, and D.J. Srolovitz, Scripta Met. 20:1389 (1986).
S.M. Foiles, MRS Proceedings 81:51 (1987).
J.J. Kruisman, V. Vitek, and J.Th.M. DeHosson, Acta. Met. 36:2729 (1988).
J.H. Rose, J.R. Smith, F. Guinea, and J. Ferrante, Phys. Rev. B 29:2963 (1984).
S.M. Foiles, Phys. Rev. B 32:7685 (1985); S.M. Foiles, M.I. Baskes, and M.S. Daw, Phys. Rev. B 33:7983 (1986).
J.A. Nelder and R. Mead, Comp J. 7:308 (1965).
O.K. Andersen, Phys. Rev. B 12:3060 (1975); H.L. Skriver, “The LMTO Method: Muffin-Tin Orbitals and Electronic Structure”, Springer-Verlag, Berlin (1984).
J. Douin, P. Veyssière, and P. Beauchamp, Phil. Mag. A54:375 (1986).
S.P. Chen, A.F. Voter, and D.J. Srolovitz, Phys. Rev. Lett. 57:1308 (1986).
S.P. Chen, D.J. Srolovitz and A.F. Voter, J. Mater. Res. 4:62 (1989).
S.P. Chen, A.F. Voter, R.C. Albers, A.M. Boring, and P.J. Hay, Scripta Met., 23:217 (1989).
J. Hack, D.J. Srolovitz, and S.P. Chen, Scripta Met. 20:1699 (1986).
V. Vitek, S.P. Chen, A.F. Voter, J.J. Kruisman, and J.Th.M. DeHosson, in: “Grain Boundary Chemistry and Intergranular Fracture”, G.S. Was, ed., Trans. Tech. Publications (1989).
C.L. White, R.A. Padgett, C.T. Liu, and S.M. Yalisov, Scripta Met. 18:1417 (1984).
S.P. Chen, A.F. Voter, R.C. Albers, A.M. Boring, and P.J. Hay, J. Mater. Res., submitted.
“Embrittlement of Engineering Alloys”, C.L. Briant and S.K. Banerji, eds. Academic Press, New York, NY (1983).
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1989 Plenum Press, New York
About this chapter
Cite this chapter
Voter, A.F., Chen, S.P., Albert, R.C., Boring, A.M., Hay, P.J. (1989). Effects of B and S on Ni3Al Grain Boundaries. In: Vitek, V., Srolovitz, D.J. (eds) Atomistic Simulation of Materials. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-5703-2_24
Download citation
DOI: https://doi.org/10.1007/978-1-4684-5703-2_24
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4684-5705-6
Online ISBN: 978-1-4684-5703-2
eBook Packages: Springer Book Archive