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1200 to 1400 K slow strain rate compressive behavior of small grain size NiAl/Ni2AlTi alloys and NiAl/Ni2AlTi–TiB2 composites

Published online by Cambridge University Press:  31 January 2011


J. Daniel Whittenberger
Affiliation:
NASA Lewis Research Center, Cleveland, Ohio 44135
R. K. Viswanadham
Affiliation:
Multi-Metals, 715 East Gray Street, Louisville, Kentucky 40202
S. K. Mannan
Affiliation:
Martin Marietta Laboratories, 1450 South Rolling Road, Baltimore, Maryland 21227–3898
K. S. Kumar
Affiliation:
Martin Marietta Laboratories, 1450 South Rolling Road, Baltimore, Maryland 21227–3898

Abstract

Since 1976 NiAl–Ni2AlTi alloys have been known to possess elevated temperature mechanical properties approaching those of Ni-base superalloys; however, due to their apparent brittleness, little additional work has been undertaken to exploit this strength. In an attempt to instill ductility in these materials, small grain size single (Ni–45Al–5Ti) and two (Ni–40Al–10Ti) phase intermetallics were fabricated by XDTM technology and tested (XDTM is a trademark of Martin Marietta Corporation). As these compositions have the potential for being the matrix material in high temperature composites, Ni–40Al–10Ti and Ni–45Al–5Ti with 20 vol.% TiB2 in the form of ∼1 μm diameter particles were also investigated. The as-fabricated materials were fully dense and polycrystalline. The grain sizes measured ∼8 μm for Ti-poor and about 15 μm for the Ti-rich unreinforced materials but could not be determined for either TiB2 containing composite. Elevated temperature compression testing was conducted to about 8% deformation between 1200 and 1400 K with strain rates varying from ∼10−4 to ∼10−7 s−1. The majority of the tests exhibited diffuse yielding over approximately 1% strain followed by negative strain hardening. However, a few experiments resulted in steady state behavior where deformation continued under a constant stress. The flow strengths on yielding of both forms of Ni–40Al–10Ti were higher than those for the Ni–45Al–5Ti versions. For each matrix composition the addition of 20 vol.% TiB2 decreased the strength at the higher strain rates in comparison to the TiB2-free forms. During slow deformation conditions, however, the particles do provide reinforcement. Light optical microscopy of tested specimens revealed that these materials are generally quite brittle as numerous longitudinal and transverse cracks were found irrespective of the type of stress-strain behavior.


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Articles
Copyright
Copyright © Materials Research Society 1989

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References

1Strutt, P. R., Polvani, R. S., and Ingram, J. C., Metall. Trans. A 7A, 23 (1976).CrossRefGoogle Scholar
2Polvani, R. S., Tzeng, Wen-Shian, and Strutt, P. R., Metall. Trans. A 7A, 33 (1976).CrossRefGoogle Scholar
3Strutt, P. R. and Kear, B. H., in High-Temperature Ordered Intermetallic Alloys II, Proc. Mater. Res. Soc. Symp., edited by Kock, C.C., Liu, C.T., and Stoloff, N. S. (MRS, Pittsburgh, PA, 1985), Vol. 39, p. 279.Google Scholar
4Schulson, E. M. and Barker, D. R., Scripta Metall. 17, 519 (1983).CrossRefGoogle Scholar
5Whittenberger, J.D., J. Mat. Sci. 23, 235 (1988).CrossRefGoogle Scholar
6Polvani, R.S., Strutt, P. R., and Tzeng, Wen-Shian, Proceedings of EMSA, 34th Annual Meeting, edited by Bailey, G. W. (Claitor's Publ. Div., Baton Rouge, LA, 1976), p. 595.Google Scholar
7Westwood, A.R.C., Metall. Trans. A 19A, 749 (1988).CrossRefGoogle Scholar
8Viswanadham, R. K., Whittenberger, J. Daniel, Mannan, S.K., and Sprissler, B., High-Temperature /High Performance Composites, Proc. Mater. Res. Soc. Symp., edited by Lemkey, F. D., Evans, A.G., Fishman, S.G., and Strife, J.R. (MRS, Pittsburgh, PA, 1988), Vol. 120, p. 89.Google Scholar
9Whittenberger, J. Daniel, Viswanadham, R.K., Mannan, S.K., and Sprissler, B., accepted for publication by J. Mat. Sci.Google Scholar
10Whittenberger, J. D., Mater. Sci. Eng. 57, 77 (1983).CrossRefGoogle Scholar
11Whittenberger, J. D., Mater. Sci. Eng. 73, 87 (1985).CrossRefGoogle Scholar
12Whittenberger, J. D., J. Mat. Sci. 22, 235 (1987).CrossRefGoogle Scholar
13Nash, P. and Liang, W. W., Metall. Trans. A 16A, 319 (1985).CrossRefGoogle Scholar
14Taylor, A. and Floyd, R. W., J. Inst. Metals 81, 25 (1952/1953).Google Scholar
15Strutt, P.R., Ingram, J. C., and Polvani, R. S., Proceedings of 13th Annual Meeting of Electron Society of America, edited by Arceneaux, C. J. (Claitor's Publ. Div., Baton Rouge, LA, 1972), p. 590.Google Scholar
16Ball, A. and Smallman, R.E., Acta Metall. 14, 1517 (1966).CrossRefGoogle Scholar
17Lautenschlager, E.P., Tisone, T. C., and Brittain, J. O., Phys. Stat. Sol. 20, 443 (1967).CrossRefGoogle Scholar
18Yang, W. J. and Dodd, R. A., Met. Sci. J. 7, 41 (1973).CrossRefGoogle Scholar
19Edwards, G.R., McNelley, T.R., and Sherby, O.D., Phil. Mag. 32, 40 (1975).CrossRefGoogle Scholar

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1200 to 1400 K slow strain rate compressive behavior of small grain size NiAl/Ni2AlTi alloys and NiAl/Ni2AlTi–TiB2 composites
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1200 to 1400 K slow strain rate compressive behavior of small grain size NiAl/Ni2AlTi alloys and NiAl/Ni2AlTi–TiB2 composites
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1200 to 1400 K slow strain rate compressive behavior of small grain size NiAl/Ni2AlTi alloys and NiAl/Ni2AlTi–TiB2 composites
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