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Study of the Effects of Al, Ta, W Additions on the Microstructure and Properties of Mosi2 Base Alloys

Published online by Cambridge University Press:  22 February 2011

A. Stergiou  and
P. Tsakiropoulos
A. Stergiou
Affiliation:
Department of Materials Science and Engineering, University of Surrey Guildford GU2 5XH, UK
P. Tsakiropoulos
Affiliation:
Department of Materials Science and Engineering, University of Surrey Guildford GU2 5XH, UK
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Abstract

Solidification microstructures and phase selection in ingots and melt-spun ribbons of MoSi2, MoSi2-W-Ta and MoSi2-Al alloys were studied. Rapid quenching from the melt refined the grain size of all alloys by two orders of magnitude compared to the ingots. Zone A microstructures were formed in the wheel side of all alloy ribbons. Addition of W and Ta and of Al suppressed the formation of Mo5Si3 in the ingots and ribbons. Tungsten exhibited complete solid solubility in MoSi2. In the ribbons the solubility of Ta in MoSi2 was extended to 2 at% in Zone A, and in the ingots and zone B of the ribbons hexagonal (C40) TaSi2 and tetragonal (C11b) MoSi2 structures were formed. A fine lamellar microstructure between the Cllb and C40 phases was formed at 1350°C after 48h. Addition of Al changed dramatically the solidification microstructure which consisted of two phases C40 Mo(Al0.5Si0.5)2 and C54 MoAl1.3Si0.7. In the ingots the room temperature hardness decreased with addition of W and Ta and of Al. Addition of Al increased the thermal stability of the MoSi2-Al alloy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 911
Copyright
Copyright © Materials Research Society 1995

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