Creep and Fatigue at Elevated Temperatures. Creep Behavior of Orthorhombic Ti2AlNb Based Intermetallic Alloys.

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  • TANG Feng
    Materials Engineering Laboratory, National Institute for Materials Science
  • NAKAZAWA Shizuo
    Materials Engineering Laboratory, National Institute for Materials Science
  • HAGIWARA Masuo
    Materials Engineering Laboratory, National Institute for Materials Science

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  • Creep Behavior of Orthorhombic Ti2AlNb Based Intermetallic Alloys

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For the purpose of studying the creep behavior of orthorhombic Ti2AlNb (O-phase) based alloys, nine O-based alloys modified by V, Mo, or W were prepared. These alloys were heat-treated under various conditions. The creep tests were carried out at 650-750°C/310MPa in air, using a dead-weight creep-rupture machine. The activation energy of creep was calculated to be 327 to 416kJ/mol, which showed that the creep process was controlled by a dislocation climb. The alloys modified by W exhibited lower steady-state creep rates and longer transient times than the alloys modified by Mo and V, which is thought to be due to the lower diffusion rate of W in O-based alloys. The transformation of B2 phase into O phase during creep test runs at temperatures lower than the aging temperature was responsible for the large transient creep strain in a B2+O alloy. The effect of precipitate size on creep behavior is discussed.

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