Hostname: page-component-76fb5796d-25wd4 Total loading time: 0 Render date: 2024-04-25T21:17:33.253Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Published online by Cambridge University Press:  22 February 2011

S.-S. Yang ,
D.-H. Hou ,
J. Shyue ,
R. Wheeler  and
H. L. Fraser
S.-S. Yang
Affiliation:
Department of Materials Science and EngineeringThe Ohio State University, 2041 College Road, Columbus, OH 43210
D.-H. Hou
Affiliation:
Department of Materials Science and EngineeringThe Ohio State University, 2041 College Road, Columbus, OH 43210
J. Shyue
Affiliation:
Department of Materials Science and EngineeringThe Ohio State University, 2041 College Road, Columbus, OH 43210
R. Wheeler
Affiliation:
Department of Materials Science and EngineeringThe Ohio State University, 2041 College Road, Columbus, OH 43210
H. L. Fraser
Affiliation:
Department of Materials Science and EngineeringThe Ohio State University, 2041 College Road, Columbus, OH 43210
Get access

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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 1359
Copyright
Copyright © Materials Research Society 1995

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. 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. 291–302 (1994)Google Scholar
2. Hull, D. and Bacon, D. J., Introduction to Dislocations, 3rd Ed., pp. 124 (Pergamon Press 1984)Google Scholar
3. Cahn, R. W. and Coll, J. A., Acta Metall., 9, 138–148 (1961)Google Scholar
4. Kelly, A. and Groves, G. W., Crystallography and Crystal Defects, pp. 290, Addison-Wesley, Reading, MA (1970)Google Scholar
5. Goo, E., Duerig, T., Melton, K. and Sinclair, R., Acta Metall., vol. 33, No. 9, pp. 1725–1733 (1985)Google Scholar
6. Yang, S.-S. and Vasudevan, V. K., Scripta Metallurgica et Materialia, vol. 31, No. 7, pp. 879–884 (1994)Google Scholar