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Environmental Effects in B2 FeAl Alloys

Published online by Cambridge University Press:  01 January 1992

O. Klein ,
P. Nagpal  and
I. Baker
O. Klein
Affiliation:
Thayer School of Engineering, Dartmouth College, Hanover, NH 03755
P. Nagpal
Affiliation:
Thayer School of Engineering, Dartmouth College, Hanover, NH 03755
I. Baker
Affiliation:
Thayer School of Engineering, Dartmouth College, Hanover, NH 03755
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Abstract

The low room-temperature ductility of iron-rich B2-structured FeAl has been attributed to atomic hydrogen arising from a reaction between water vapor and aluminum atoms at crack tips [C.T. Liu and C.G. McKamey, in “High Temperature Aluminides and Intermetallics”, eds. S.H. Whang et al (TMS, Warrendale, PA, 1990), p. 133]. Since hydrogen diffusion is time-dependent, the ductility might be expected to improve with increasing strain rate. Such behavior has been confirmed by tensile tests on Fe-45A1 and Fe-40Al-5Cr in air at strain rates ranging from 1 × 10−6 s−1 to 1 s−1. A brittle-to-ductile transition was observed at a strain rate of ∼10−2 s−1. The material with Cr appeared to be slightly less susceptible to environmental embrittlement, as reflected by the shift of the brittle-to-ductile transition to a lower strain rate. Fracture toughness tests on Fe-45A1 in air demonstrated a similar strain rate effect.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 935
Copyright
Copyright © Materials Research Society 1995

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References

REFERENCES

1. Liu, C.T. and McKamey, C.G., in High Temperature Aluminides and Intermetallics, edited by Whang, S.H. et al (TMS, Warrendale, PA, 1990), p. 133.Google Scholar
2. Nagpal, P. and Baker, I., Mater. Char. 27, 167 (1991).Google Scholar
3. Liu, C.T. and George, E.P., Mater. Res. Soc. Proc. 213, 527 (1991).Google Scholar
4. McKamey, C.G., Horton, J.A. and Liu, C.T., J. Mater. Res. 4, 1156 (1989).Google Scholar
5. Munroe, P.R. and Baker, I., Scripta Metall. 24, 2273 (1990).Google Scholar
6. Liu, C.T., Lee, E.H. and McKamey, C.G., Scripta Metall. 23, 875 (1989).Google Scholar
7. Gaydosh, DJ. and Nathal, M.V., Scripta Metall. 24, 1281 (1990).Google Scholar
8. Liu, C.T. and George, E.P., Scripta Metall. 24, 1285 (1990).Google Scholar
9. Schmidt, B., Nagpal, P. and Baker, I., Mater. Res. Soc. Proc. 133, 755 (1989).Google Scholar
10. Crimp, M.A., Vedula, K.M., and Gaydosh, D.J., Mater. Res. Soc. Proc. 81, 499 (1987).Google Scholar
11. Nagpal, P. and Baker, I, Metall. Trans. 21A, 2281 (1990).Google Scholar
12. Munroe, P.R. and Baker, I., J. Mat. Sci. 24, 4246 (1990).Google Scholar
13. Rigney, J.D. et al, Mater. Res. Soc. Proc. 213, 1001 (1991).Google Scholar
14. Rivlin, V.G. and Raynor, G.V., Int. Met. Rev. 4, 139 (1980).Google Scholar
15. Klein, O. and Baker, I., unpublished work.Google Scholar
16. Munroe, P.R. and Baker, I., Acta Metall. 39, 1011 (1991).Google Scholar