Hostname: page-component-8448b6f56d-jr42d Total loading time: 0 Render date: 2024-04-23T22:16:59.668Z Has data issue: false hasContentIssue false
  • English
  • Français

The Microstructure and Superplastic Behavior of Clean Mechanically Alloyed Titanium–Titanium Boride Alloys

Published online by Cambridge University Press:  10 February 2011

A.P. Brown ,
R Brydson ,
C. Hammond ,
A. Wisbey  and
T.M.T. Godfrey
A.P. Brown
Affiliation:
Department of Materials, School of Process, Environmental and Materials Engineering, University of Leeds, Leeds, LS2 9JT, UK
R Brydson
Affiliation:
Department of Materials, School of Process, Environmental and Materials Engineering, University of Leeds, Leeds, LS2 9JT, UK
C. Hammond
Affiliation:
Department of Materials, School of Process, Environmental and Materials Engineering, University of Leeds, Leeds, LS2 9JT, UK
A. Wisbey
Affiliation:
Structural Materials Centre, Defence Evaluation Research Agency, Farnborough, Hants, GU14 OLX, UK
T.M.T. Godfrey
Affiliation:
Structural Materials Centre, Defence Evaluation Research Agency, Farnborough, Hants, GU14 OLX, UK
Get access

Abstract

The superplastic forming (SPF) of titanium alloys is an established technology. A reduction in grain size from that of the typical sheet materials would lead to enhanced SPF properties and hence a reduction in production cycle times. This study describes the microstructural development and superplastic behaviour of fine-grained Ti-6%Al-4%V alloys. Ball-milling Ti-6%Al-4%V powder produces a nanocrystalline material; however on consolidation by hot isostatic pressing rapid grain growth occurs. Addition of boron powder during milling leads to boride precipitates in the matrix of the consolidated alloy. The precipitates are dispersed inhomogeneously, resulting in localized grain refinement. Superplastic testing revealed cavitation formation but in comparison to conventional sheet material, large elongations were achieved at relatively high strain rates.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 601: Symposium HH – Superplasticity-Current Status & Future Potential , 1999 , 229
Copyright
Copyright © Materials Research Society 2000

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] Pilling, J., Ridley, N., Superplasticity in Crystalline Solids, Int. of Metals, p. 65, (1989)Google Scholar
[2] Hamilton, C.H., Ghosh, A.K., Mahoney, M.M., Advanced Processing Methods for Titanium, TMS-AMIE, p. 129, (1982)Google Scholar
[3] Ashby, M.F., Verrall, R.A., Acta Metall., 21, 149, (1973)10.1016/0001-6160(73)90057-6Google Scholar
[4] Inagaki, H., Zeitschrift fur Metallkunde, 86, 643, (1995)Google Scholar
[5] Goodwin, P.S., Hinder, T.M.T., Wisbey, A., Ward-Close, C.M., Mat. Sc. Forum, 269, 53, (1998)10.4028/www.scientific.net/MSF.269-272.53Google Scholar
[6] Godfrey, T.M.T., Wisbey, A., Goodwin, P.S., Ward-Close, C.M., Brown, A., Brydson, R., Hammond, C., Proceedings of 9th World Conference on Titanium, (1999)Google Scholar
[7] Itoh, G., Cheng, T.T., Loretto, M.H., Mat. Trans., JIM, 35 (8), 501, (1994)10.2320/matertrans1989.35.501Google Scholar
[8] Lee, D., Backofen, W.A., Trans. TMS-AIME, 239, 1034, (1967)Google Scholar
[9] Leader, J.R., Neal, D.F., Hammond, C., Metall. Trans. A, 14A, 93, (1986)10.1007/BF02644445Google Scholar
[10] McQuillan, A.D., McQuillan, M.K., Titanium, Butterworths Sci. Pub., p. 172 273, S(1955)Google Scholar
[11] Wert, J.A., Paton, N.E., Metall. Trans. A, 14A, 2535, (1983)10.1007/BF02668895Google Scholar
[12] Gerling, R., Leitgreb, R., Schimansky, F.P., Mat. Sci. and Eng., A252, 239, (1998)10.1016/S0921-5093(98)00656-XGoogle Scholar