Thermal expansion and elastic moduli of the silicide based intermetallic alloys Ti{sub 5}Si{sub 3}(X) and Nb{sub 5}Si{sub 3}
- Shanghai Jiao Tong Univ. (China)
Silicides are among those potential candidates for high temperature application because of their high melting temperature, low density and good oxidation resistance. Recent interest is focused on molybdenum silicides and titanium silicides. Extensive investigation has been carried out on MoSi{sub 2}, yet comparatively less work was performed on titanium silicides such as Ti{sub 5}Si{sub 3} and Ti{sub 3} and TiSi{sub 2} which are of lower density than MoSi{sub 2}. Fundamental understanding of the titanium silicides` properties for further evaluation their potential for practical application are thus needed. The thermal expansion coefficients and elastic moduli of intermetallic compounds are two properties important for evaluation as a first step. The thermal expansion determines the possible stress that might arise during cooling for these high melting point compounds, which is crucial to the preparation of defect free specimens; and the elastic moduli are usually reflections of the cohesion in crystal. In Frommeyer`s work and some works afterwards, the coefficients of thermal expansion were measured on both polycrystalline and single crystal Ti{sub 5}Si{sub 3}. The elastic modulus of polycrystalline Ti{sub 5}Si{sub 3} was measured by Frommeyer and Rosenkranz. However, in the above works, the referred Ti{sub 5}Si{sub 3} was the binary one, no alloying effect has been reported on this matter. Moreover, the above parameters (coefficient of thermal expansion and elastic modulus) of Nb{sub 5}Si{sub 3} remain unreported so far. In this paper, the authors try to extend the knowledge of alloyed Ti{sub 5}Si{sub 3} compounds with Nb and Cr additions. Results on the coefficients of thermal expansion and elastic moduli of Ti{sub 5}Si{sub 3} compounds and Nb{sub 5}Si{sub 3} are presented and the discussion is focused on the alloying effect.
- OSTI ID:
- 605792
- Journal Information:
- Scripta Materialia, Vol. 38, Issue 2; Other Information: PBD: 22 Dec 1997
- Country of Publication:
- United States
- Language:
- English
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