Hostname: page-component-586b7cd67f-t7czq Total loading time: 0 Render date: 2024-11-25T15:53:49.604Z Has data issue: false hasContentIssue false
  • English
  • Français

Evaluation of A Ti-22ai-23nb “Orthorhombic” Alloy for use as the Matrix in A High Temperature Ti-Based Composite

Published online by Cambridge University Press:  15 February 2011

J. A. Graves ,
P. R. Smith  and
C. G. Rhodes
J. A. Graves
Affiliation:
Rockwell International Science Center, Thousand Oaks, CA 91360
P. R. Smith
Affiliation:
Materials Directorate, Wright-Laboratories, Wright-Patterson AFB, OH 45433
C. G. Rhodes
Affiliation:
Rockwell International Science Center, Thousand Oaks, CA 91360
Get access

Abstract

The production of titanium aluminide intermetallic compound foil represents a significant manufacturing challenge. Cold rolling, which imparts excellent thickness uniformity and surface finish characteristics that are of benefit in composite fabrication, is especially difficult with these alloys. However, recent modifications in Ti aluminide alloy compositions and advances in thermomechanical processing have made it possible to produce foil of thickness less than 100 μm, having the microstructure and mechanical property characteristics required for composite fabrication and improved performance. This paper describes the properties of a new Ti aluminide alloy, of nominal composition Ti-22AI-23Nb (at.%), comprising a three phase microstructure of α2 (Ti3Al), an ordered orthorhombic phase (Ti2AINb) and an ordered beta phase. The discussion emphasizes the processing of this alloy through cold rolling to foil, and the associated microstructures and mechanical property characteristics that are relevant to the use of this foil to form a composite matrix.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 273: Symposium Q – Intermetallic Matrix Composites II , 1992 , 31
Copyright
Copyright © Materials Research Society 1992

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

REFERENCES

1. Larsen, J.M., et. al., ”Titanium Aluminides for Aerospace Applications”, Proceedings of the Symposium High Temperature Aluminides and Intermetallics, Whang, S.H., Liu, C.T., Pope, D.P. sand Stiegler, J.O. (eds.), TMS-AIME, Warrendale, PA (1990) 521.Google Scholar
2. Jha, S.C., et. al., Advanced Materials and Processes, 139, 87 (1991).Google Scholar
3. Rowe, G., “Recent Developments in Ti-Al-Nb Titanium Aluminides”, Proceedings of the Symposium High Temperature Aluminides and Intermetallics, Whang, S.H., Liu, C.T., Pope, D.P. and Stiegler, J.O. (eds.), TMS-AIME, Warrendale, PA (1990) 375.Google Scholar
4. Smith, P. R. et. al., “Evaluation of an SCS-6/Ti-22AI-23Nb “Orthorhombic” Composite”, Proceedings of This Symposium.Google Scholar
5. Lee, D., et. al., Trans. AIME, 239, 1467 (1967).Google Scholar
6. Sukonnik, I.M., Semiatin, S.L. and Haynes, M., Scnpta Met., 26 (1992) 993–998.Google Scholar
7. Tabor, D., ”Indentation Hardness and Its Measurement: Some Cautionary Comments” pp. 129–159 in ASTM STP No. 889, Microindentation Techniaues in Materials Science and Engineering, Blau, P. J. and Lawn, B. R. (eds.), American Society for Testing and Materials, Philadelphia, PA, 1985.CrossRefGoogle Scholar
8. Oliver, W. C., Hutchings, R. and Pethica, J. B., “Measurement of Hardness at Indentation Depths as Low as 20 Nanometers,” pp. 90–108 in ASTM STP No. 889, Microindentation Techniques in Materials Science and Enaineering, Blau, P. J. and Lawn, B. R. (eds.), American Society for Testing and Materials, Philadelphia, PA, 1985.CrossRefGoogle Scholar