Nb-Al合金粉末のHIP焼結体の機械的特性

概要

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Since Nb3Al has a high melting point and a low density, it is expected as a material of jet engine and the parts to be used at super high temperature. In this paper, the mechanical properties of HIP consolidations of Nb-Al alloy powder were studied.The compression strengths of HIPed and subsequently heat treated consolidation of Nb-Al alloy powder were higher than those of as-HIP one, because the powder boundary of as-HIP Nb-Al consolidation disappeared after heat treatment at temperature higher than 1873K and also the Nb3Al grain grew.The Nb3Al powder composites blended with Mo, W or a ceramic powder were also consolidated to improve high temperature strength. In the case of Nb3Al composites with Mo or W powder, the compression strength at high temperature were similar to those without Mo or W. On the other hand, the strengths of Nb3Al composites with ceramics were higher than those without ceramics. Especially, Nb3Al+Y2O3 consolidation showed 83MPa peak stress at 1973K.
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