Oxidation Resistant Mo-Mo^sub 2^B-Silica and Mo-Mo^sub 2^B-Silicate Composites for High Temperature Applications

Oxidation Resistant Mo-Mo^sub 2^B-Silica and Mo-Mo^sub 2^B-Silicate Composites for High Temperature Applications

Mo-Si-B alloys have been produced which have good high temperature properties (both oxidation and mechanical) but show a very high ductile to brittle transition temperature (DBTT) and hence very low toughness at room temperature.4-6 Studies of one and two phase Mo-Si alloys have shown a strong embri...

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Veröffentlicht in:JOM (1989) 2011-12, Vol.63 (12), p.44
Hauptverfasser: Cochran, J K, Daloz, W L, Marshall, P E
Format: Artikel
Sprache:eng
Schlagworte:
Alloys
Composite materials
Ductility
High temperature
Investigations
Mechanical properties
Microstructure
Molybdenum
Oxidation
Phase transitions
Silica
Solid solutions
Studies
Viscosity
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Zusammenfassung:Mo-Si-B alloys have been produced which have good high temperature properties (both oxidation and mechanical) but show a very high ductile to brittle transition temperature (DBTT) and hence very low toughness at room temperature.4-6 Studies of one and two phase Mo-Si alloys have shown a strong embrittling effect of Si in solution with Mo,7 with the Si segregating to grain boundaries and dislocation cores.8,9 As this behavior is similar to oxygen impurities in Mo,10 Si can be expected to decrease grain boundary...
ISSN:1047-4838