Hostname: page-component-78c5997874-8bhkd Total loading time: 0 Render date: 2024-11-17T19:37:57.104Z Has data issue: false hasContentIssue false
  • English
  • Français

Phase Stability and Solidification Pathways in MoSi2 Based Alloys

Published online by Cambridge University Press:  26 February 2011

P. S. Frankwicz  and
J. H. Perepezko
P. S. Frankwicz
Affiliation:
Dept. of Materials Science and Engineering, University of Wisconsin-Madison, 1509 University Ave., Madison, WI 53706, USA
J. H. Perepezko
Affiliation:
Dept. of Materials Science and Engineering, University of Wisconsin-Madison, 1509 University Ave., Madison, WI 53706, USA
Get access

Abstract

The phase equilibria developed upon substitution of Ti in MoSi2 along the pseudobinary MoSi2-TiSi2 section has been investigated using x-ray diffraction, and electron microscopy. The pseudobinary exhibits orthorhombic (C54), hexagonal (C40), and tetragonal (Cllb) crystalline structures. A hexagonal (C40) ternary silicide (Ti1-xMox)Si2 was observed to exhibit a relatively wide range of solubility with x in the range of 0.50 to 0.75, in contrast to MoSi2 which exhibits limited solubility for Ti. An analysis of the microstructural evolution following solidification reveals that the hexagonal β-(Ti,Mo)Si2 phase forms via a peritectic reaction between liquid and MoSi2 (Cllb). The primary dendritic structure during solidification in (Til-xMo2)Si2, where x z 0.80, has been determined to be tetragonal (Cllb) MoSi2. The results of this study confirm that substitutional alloying on the transition metal sublattice (Mo) is an effective approach to control of the phase stability and crystal structure in intersilicide reactions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 213: Symposium Q – High-Temperature Ordered Intermetallic Alloys IV , 1990 , 169
Copyright
Copyright © Materials Research Society 1991

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Meschter, P. J. and Schwartz, D. S., J. Metals 41 (11), 52 (1989).Google Scholar
2. Svechnikov, V. N., Kocherzhinsky, Yu. A. and Yupko, L. M., Doklady Akademii Nauk Ukrain. RSR 6A, 566 (1972).Google Scholar
3. Nowotny, H., Kieffer, R. and Schachner, H., Mh. Chem. 83, 1243 (1952).Google Scholar
4. Kurz, W. and Fisher, D. J. in Fundamentals of Solidification, 3 rd ed., Trans Tech Publications, Switzerland, p. 125 (1989).Google Scholar
5. Svechnikov, V. N., Kocherzhinsky, Yu. A. and Yupko, L. M., Doklady Akademii Nauk SSSR 182, 1313 (1968).Google Scholar
6. Frankwicz, P. S. and Perepezko, J. P., to be submitted to Scripta Met (1991).Google Scholar