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Metastable Phases and Defect Microstructures in Melt-Spun Ribbons of Nb3Al

Published online by Cambridge University Press:  26 February 2011

M. Aindow ,
J. Shyue ,
T.A. Gaspar  and
H.L. Fraser
M. Aindow
Affiliation:
Now at; School of Metallurgy and Materials, University of Birmingham, Birmingham, B15 2TT, England
J. Shyue
Affiliation:
Dept. of Materials Science & Engineering, The Ohio State University, Columbus, OH 43210
T.A. Gaspar
Affiliation:
Ribbon technology Corporation, Gahanna, OH 43230
H.L. Fraser
Affiliation:
Dept. of Materials Science & Engineering, The Ohio State University, Columbus, OH 43210
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Abstract

The phases and defects produced in a binary alloy, with nominal composition Nb-18at.% Al, have been studied using transmission electron microscopy (TEM). In addition to the equilibrium A15 phase (Nb3Al) a previously unreported Nb-rich B2 phase is present. A significant number of grow-in dislocations were observed in the A15 phase, these have b= a<100> and are predominantly screw on character. They are dissociated into two partial dislocations which bound a stacking fault according to the reaction;

<100> → > 1/2 <100> + SF + 1/2 <100>

The habit plane of the fault is shown to be {012}. These observations are compared with previous studies performed on the isostructual compound V3Si. The consequences of the observed dissociation for the plastic deformation of Nb3Al are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 209: Symposium K – Defects in Materials , 1990 , 89
Copyright
Copyright © Materials Research Society 1991

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References

REFERENCES

[1] Gaspar, T.A. and Hackman, L.E., Proceeding of the Sixth International Conference on Titanium. Cannes, France, June 1988 (Les Editions de Physique, 1988), p.739.Google Scholar
[2] Gaspar, T.A., Rotatable Crucible for Rapid Solidification Process U.S.patent No.4,907,641 (1990).Google Scholar
[3] Wood, E.A., Compton, V.B., Matthias, B.T. and Corenzwit, E., Acta Cryst. 11, 604 (1958).CrossRefGoogle Scholar
[4] Cockayne, D.J.H., Ray, I.L.F. and Whelan, M.J., Phil. Mag. A 20, 1265 (1969).Google Scholar
[5] Aindow, M., Shyue, J., Gaspar, T.A. and Fraser, H.L., in preparation (1990).Google Scholar
[6] Essman, U. and Zerwick, G., Phys. Stat. Sol. (b) 57, 611 (1973).CrossRefGoogle Scholar
[7] Essman, U., Haag, H. and Zerwick, G., Comm. on Phys. 2, 127 (1977).Google Scholar
[8] Lamine, A.B., Reynaud, F., Mai, C. and Senateur, J.P., Phil. Mag. A 38, 359 (1978).Google Scholar
[9] Nakahara, S., Mahajan, S., Wemick, J.H. and Chin, G.Y., J. Appl.Phys. 50, 3552 (1979).CrossRefGoogle Scholar
[10] Reynaud, F. and Lamine, A.B., Acta Metall. 29, 1485 (1981).CrossRefGoogle Scholar
[11] von Mises, R. and Angew., Z. Math. Mech. 8, 161 (1928).Google Scholar