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Pseudo-Twinning in A Deformed Nb-15Al-25Ti B2 Alloy

  • S.-S. Yang (a1), D.-H. Hou (a1), J. Shyue (a1), R. Wheeler (a1) and H. L. Fraser (a1)...

Abstract

An alloy with nominal composition of Nb-15Al-25Ti (in at.%) has been developed for high temperature structural applications. This alloy exhibits a B2 ordered structure in the as-cast form [1]. In addition to dislocation slip, pseudo-twinning occurs in this B2 alloy when deformed in compression at room temperature at a strain rate of ∼ 10−4 sec−1 to 3% strain. The pseudo-twinning plane has been deduced to be the {112} planes, which is similar to that in twinning of bcc metals. The mechanism of deformation pseudo-twinning in this B2 alloy is found to be analogous to the normal twinning mechanism in bcc metals, involving glide of partial dislocations with Burgers vector (b) given by b=l/6<111= on {112} planes. This pseudo-twinning mechanism causes a phase transformation from the B2 to an ordered orthorhombic structure.

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1. Hou, D.-H., Shyue, J., Yang, S.-S. and Fraser, H. L., Alloy Modeling and Design, Edited by Stocks, G.M. and Turchi, P.E.A., TMS, pp. 291302 (1994)
2. Hull, D. and Bacon, D. J., Introduction to Dislocations, 3rd Ed., pp. 124 (Pergamon Press 1984)
3. Cahn, R. W. and Coll, J. A., Acta Metall., 9, 138148 (1961)
4. Kelly, A. and Groves, G. W., Crystallography and Crystal Defects, pp. 290, Addison-Wesley, Reading, MA (1970)
5. Goo, E., Duerig, T., Melton, K. and Sinclair, R., Acta Metall., vol. 33, No. 9, pp. 17251733 (1985)
6. Yang, S.-S. and Vasudevan, V. K., Scripta Metallurgica et Materialia, vol. 31, No. 7, pp. 879884 (1994)

Pseudo-Twinning in A Deformed Nb-15Al-25Ti B2 Alloy

  • S.-S. Yang (a1), D.-H. Hou (a1), J. Shyue (a1), R. Wheeler (a1) and H. L. Fraser (a1)...

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