Microstructure and mechanical properties of oxidation resistant suction cast Nb–Si–Al alloy
作者： S. Kashyap , C.S. Tiwary , K. Chattopadhyay
DOI: 10.1016/J.MSEA.2012.08.027
关键词:
摘要: In this paper, we report a significant improvement in mechanical and oxidation properties of near eutectic Nb-Si alloys by the addition aluminum (Al) control microstructural length scale. A comparative study two Nb-18.79at%Si Nb-12.3at%Si-9at%Al were carried out. The processing for microstructure refinements out vacuum suction casting water cooled thick copper mould. It is shown that Al suppresses Nb3Si phase promotes beta Nb5Si3 under nonequilibrium solidification condition. scale particular spacing reduces significantly to 50-100 nm cast ternary alloy. detailed TEM shows presence delta-Nb11Si4 Nb matrix. hardness solid solution can be increased as consequence level observed intermetallic due well oriented precipitates. Compression test yields ultimate strength 1.8 +/- 0.1 GPa engineering strain 2.3 0.03%. comparison, binary Nb-18.79 at% Si alloy possesses an 1.35 0.2 0.01% when processed identical conditions. latter exhibits coarser (300-400 nm) brittle behavior. indentation fracture toughness containing value 20.2 0.5 MPa root m which represents major over bulk thermal studies confirm multifold resistance up 1000 degrees C. (C) 2012 Elsevier B.V. All rights reserved.
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