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Microstructure and performance of NiAl-39V Eutectic Alloy prepared by Arc melting
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College of Materials and Metallurgy, Inner Mongolia University of Science and Technology

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    Abstract:

    SNi-30.5Al-39V (at%) alloy is prepared by vacuum non-consumable arc meltingSin this paper.The phase composition and morphology of the alloy at different solidification positions were analyzed by optical microscopy (OM), X-ray diffraction (XRD) and scanning electron microscopy (SEM).And the results show that the solidification structure of Ni-30.5Al-39V(at%) is composed of NiAl+V sheet eutectic.Through the test of fracture toughness and high temperature compression, the results show that the fracture toughness of NiAl-39V alloy is three times that of NiAl alloy, and crack deflection and crack bonding are the main toughening mechanisms.Finally, based on the Arrhenius model, the constitutive relation of NiAl-39V alloy was constructed as ε = 5.398×[sinh(0.037128σ)]2.3exp(-109.95×103/RT) and the activation energy was 109.95 kJ?mol-1. Keywords: Eutectics; Room temperature fracture toughness; High temperature strength; Constitutive equation

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[ZHANG Jianfei, HAO Wenwei, XU Pengfei, Dong Yuelei, ZHANG Yuhao. Microstructure and performance of NiAl-39V Eutectic Alloy prepared by Arc melting[J]. Rare Metal Materials and Engineering,2019,48(5):1523~1528.]
DOI:10.12442/j. issn.1002-185X.20180317

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History
  • Received:April 02,2018
  • Revised:April 11,2018
  • Adopted:April 27,2018
  • Online: June 04,2019
  • Published: