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.


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    Title :

    Ductile low-density alloys based on niobium


    Additional title:

    Duktile Legierungen auf Niob-Basis mit niedriger Dichte


    Contributors:


    Publication date :

    1995


    Size :

    8 Seiten, 12 Bilder, 20 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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