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Current Status of Mo-Si-B Silicide Alloys for Ultra-high Temperature Applications

Published online by Cambridge University Press:  01 February 2011

Martin Heilmaier ,
Holger Saage ,
Manja Krüger ,
Pascal Jehanno ,
Mike Böning  and
Heinrich Kestler
Martin Heilmaier
Affiliation:
m.heilmaier@phm.tu-darmstadt.deamheilos@yahoo.com, TU Darmstadt, Materials Science, Darmstadt, Germany
Holger Saage
Affiliation:
holger.saage@ovgude, Otto-von-Guericke University Magdeburg, Institute for Materials and Joining Technology, Magdeburg, Germany
Manja Krüger
Affiliation:
manja.krueger@ovgu.de, Otto-von-Guericke University Magdeburg, Institute for Materials and Joining Technology, Magdeburg, Germany
Pascal Jehanno
Affiliation:
pascal.jehanno@plansee.com, Plansee SE, Technology Centre, Reutte, Austria
Mike Böning
Affiliation:
mike.boening@plansee.com, Plansee SE, Technology Centre, Reutte, Austria
Heinrich Kestler
Affiliation:
heinrich.kestler@plansee.com, Plansee SE, Technology Centre, Reutte, Austria
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Abstract

We review the current development status of molybdenum borosilicide (Mo-Si-B) alloys for ultra-high temperature applications in air. The assessment of several ingot and powder metallurgy approaches revealed that (i) the presence of a continuous Mo solid solution matrix is mandatory for adequate low temperature toughness and (ii) wrought processing of such alloys at temperatures established for refractory metals requires the presence of an ultrafine (sub-micron) microstructure. Both prerequisites could be fulfilled using mechanical alloying (MA) as the crucial processing step , however, values for the ductile-to-brittle transition temperature (DBTT) below 800°C could not be obtained due to grain boundary embrittlement by Si segregation. First results on the effect of different microalloying additions on a reduction of this segregation exemplified for the Mo solid solution will be presented and discussed.

Keywords

Motoughnessoxidation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1128: Symposium U – Advanced Intermetallic-Based Alloys for Extreme Environment and Energy Applications , 2008 , 1128-U07-07
Copyright
Copyright © Materials Research Society 2009

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