In aircraft engines, density and specific properties are important considerations for materials selection to reduce weight and increase efficiency. Of the refractory metals, Nb-base materials are of greatest interest because of their lower densities. However, like the other refractory alloys, the oxidation resistance of Nb limits its applicability since at most temperatures a fail-safe coating is required. This limitation can be greatly reduced by alloying Nb with substantial concentrations of Ti and lesser quantities of Al, Cr, Hf and V. This has led to development of a class of alloys with densities of 6.2 - 6.9 g/cm 3 which can be used uncoated in air to 650 deg C, and which have sufficient oxidation resistance at 1000 deg C that coating failure is non-catastrophic. The behavior of a family of low-density alloys will be described for oxidation, physical properties, mechanical properties from room temperature to 1200 deg C and hot and cold formability. The use of these alloys in composites containing metallic and intermetallic reinforcements will also be discussed.
Ductile low-density alloys based on niobium
Duktile Legierungen auf Niob-Basis mit niedriger Dichte
1995
8 Seiten, 12 Bilder, 20 Quellen
Aufsatz (Konferenz)
Englisch
Protective Coatings for Niobium Alloys
British Library Conference Proceedings | 1998
|Oxidation behavior of binary niobium alloys
TIBKAT | 1960
|Metastable structures in drop tube processed niobium based alloys
Elsevier | 1986
|1185 Niobium-Base Alloys for Space Nuclear Applications
British Library Conference Proceedings | 2005
|Protective molybdenum disilicide coating for niobium based alloys in aerospace applications
British Library Conference Proceedings | 1992
|