Skip to main content
×
×
Home

Creep Deformation Studies in Directionally Solidified MoSi2-Mo5Si3 Eutectics

  • D. P. Mason (a1) and D. C. Van Aken (a1)
Abstract

The high temperature deformation behavior of directionally solidified (DS) MoSi2-Mo5Si3 eutectics was studied and compared to powder processed MoSi2-Mo5Si3 composites having the same volume fraction of Mo5Si3. Decremental step strain rate tests were performed in the temperature range of 1100-1300°C and at strain rates between 10−4 to 10−6/s. A considerable increase in the flow stress was observed for the directionally solidified material. At 1200°C and a strain rate of 10−6/s the flow stress of the DS eutectic was 255 MPa as compared to 20 MPa for the powder processed composite. The high temperature strength of the DS eutectic was unaffected by changes in the scale of the lamellar micro-structure and these results were modeled using a constitutive relation for power law creep. A stress exponent of 4.5 and an activation energy of 300 kJ/mol was determined for the DS eutectic. Evidence of dislocation glide and climb was observed in the MoSi2 lamellae whereas the dislocation density was small in the Mo5Si3 phase. The improved creep strength of the eutectic is believed to be a result of both the fibrous morphology and a stronger interface structure as compared to the powder processed composite.

Copyright
References
Hide All
1.Petrovic, J. J. and Vasudevan, A.K., Intermetallic Matrix Composites II. eds. Miracle, D.B., Anton, D.L. and Graves, J.A. (Mat. Res. Soc. Proc.vol. 273, Pittsburg, PA 1992) p 229.
2.Alman, D.E., Shaw, K.G., Stoloff, N.S. and Rajan, K., Mat. Sci. and Eng. A155, 95 (1992).
3.Gibala, R., Ghosh, A.K., Van Aken, D.C., Srolovitz, D.J., Basu, A., Chang, H., Mason, D.P. and Yang, W., Mat. Sci. and Eng. A155, 147 (1992).
4.Wiederhom, S.M., Gettings, R.J., Roberts, D.E. and Ostertag, C., Mat. Sci. and Eng. A155, 147 (1992).
5.Aiken, R.M., Scripta Metall. 26, 1025 (1992).
6.Mason, D. P. and Van Aken, D. C., Scripta Metall., in press.
7.Anstis, G.R., Chantikul, P., Lawn, B.R. and Marshall, D.B., J. Am. Ceram. Soc. 64, 9 (1981).
8.Bhattacharya, A.K. and Petrovic, J.J., J. Am. Ceram. Soc. 74, 10 (1992).
9.Srinivasan, S.R. and Schwartz, R.B., J. Mater. Res. 7, 1610 (1992).
10.Hardwick, D. A., Martin, P. L. and Moores, R. J..Scripta Metall. 27, 391 (1992).
11.Cotton, J. D., Kim, Y. S. and Kaufman, M. J., Mat. Sci. and Eng. A144, 287 (1991).
12.Sadananda, K., Feng, C. R., Jones, H. and Petrovic, J. J., Mat. Sci. and Eng. A155, 227 (1992).
13.Suzuki, M., Nutt, S. R. and Aiken, R. M. Jr, Intermetallic Matrix Composites II. eds. Miracle, D. B., Anton, D. L. and Graves, J. A. (Mat. Res. Soc. Proc.vol. 273, Pittsburg, PA 1992) p267.
14.Bose, S., Mat. Sci. and Eng. A155, 217 (1992).
15.Anton, D. L. and Shaw, D. M., High Temperature Ordered Intermetallic Alloys IV, eds. Johnson, L. A., Pope, D.P. and Stiegler, J.O., (Mat. Res. Soc. Proc.Vol. 213, Pittsburg, PA 1991) p.733.
16.Kung, H., Mason, D.P., Basu, A., Chang, H., Van Aken, D.C, Ghosh, A.K and Gibala, R., Intermetallic Matrix Composites II, eds. Miracle, D. B., Anton, D. L. and Graves, J. A. (Mat. Res. Soc. Proc. vol. 273, Pittsburg, PA 1992) p 241.
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

MRS Online Proceedings Library (OPL)
  • ISSN: -
  • EISSN: 1946-4274
  • URL: /core/journals/mrs-online-proceedings-library-archive
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed