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High-Temperature Compression Strength of Directionally Solidified Nb-Mo-W-Ti-Si In-Situ Composites

Published online by Cambridge University Press:  21 March 2011

Hisatoshi Hirai ,
Tatsuo Tabaru ,
Jiangbo Sha ,
Hidetoshi Ueno ,
Akira Kitahara  and
Shuji Hanada
Hisatoshi Hirai
Affiliation:
Kyushu National Industrial Research Institute, Tosu, Saga 841–0052, Japan
Tatsuo Tabaru
Affiliation:
Kyushu National Industrial Research Institute, Tosu, Saga 841–0052, Japan
Jiangbo Sha
Affiliation:
Kyushu National Industrial Research Institute, Tosu, Saga 841–0052, Japan
Hidetoshi Ueno
Affiliation:
Kyushu National Industrial Research Institute, Tosu, Saga 841–0052, Japan
Akira Kitahara
Affiliation:
Kyushu National Industrial Research Institute, Tosu, Saga 841–0052, Japan
Shuji Hanada
Affiliation:
Institute for Materials Research, Tohoku University, Sendai, Miyagi 980–8577, Japan
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Abstract

Directionally solidified Nb-xMo-22Ti-18Si (x = 10, 20 and 30 mol%) and Nb-10Mo-yW-10Ti-18Si (y = 0, 5, 10 and 15 mol%) alloys were prepared. All of the alloys consisted of Nb solid solution and (Nb, Mo, (W,) Ti)5Si3 silicide. In compression tests performed on the Nb-xMo-22Ti-18Si alloys, a sample with x = 10 had the highest maximum stress at 1670 K, but it showed a sharp stress drop after reaching the maximum stress. Samples with x = 20 and 30 showed lower yield and lower maximum stress than that with x = 10, and they showed a small stress drop and an almost constant flow stress of 330 and 400 MPa, respectively. The sample with x = 20 showed a minimum creep rate (εm) of 9.6 × 10-7 s-1 at 1670 K at a stress of 200 MPa. The yield stress of the Nb-10Mo-yW-10Ti-18Si alloys increased with increasing W content, although the stress decreased gradually after reaching the maximum stress and showed no steady state deformation. The εm of the sample with y = 15 was 1.4 × 10-7 s-1 at 1670 K at a stress of 200 MPa, which was much slower than that of Nb-20Mo-22Ti-18Si.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 646 , 2000 , N5.41.1
Copyright
Copyright © Materials Research Society 2001

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References

REFERENCES

1. English, C., Niobium, Proc. of the International Symposium, ed. Stuart, H. (Metall. Soc. AIME, 1984) pp. 239–324.Google Scholar
2. Bewlay, B. P., Lewandowski, J. J. and Jackson, M. R., JOM, 49, August, 44 (1997).Google Scholar
3. Jackson, M. R., Bewlay, B. P. and Rowe, R. G., JOM, 47, January, 39 (1996).Google Scholar
4. Subramanian, P. R., Mendiratta, M. G. and Dimiduk, D. M., JOM, 48, January, 33 (1996).Google Scholar
5. Mendiratta, D. G. and Dimiduk, D. M., Metall. Trans. A, 24A, 501 (1993).Google Scholar
6. Menon, E. S. K., Subramanian, P. R. and Dimiduk, D. M., Metall. Trans. A, 27A, 1647 (1996).Google Scholar
7. Tabaru, T. and Hanada, S., Intermetallics, 6, 735 (1998).Google Scholar
8. Tabaru, T. and Hanada, S., Intermetallics, 7, 807 (1999).Google Scholar
9. Hirai, H., Tabaru, T., Ueno, H., Kitahara, A. and Hanada, S., J. Japan. Inst. Metals, 64, 474 (2000).Google Scholar
10. Sha, J.-B., Hirai, H., Tabaru, T., Kitahara, A., Ueno, H. and Hanada, S., J. Japan. Inst. Metals, 64, 331 (2000).Google Scholar
11. McAdams, G. D., J. Inst. Metals, 93, 559 (1964–1965).Google Scholar