Creep Behavior of Orthorhombic Ti_2AlNb Based Intermetallic Alloys(Special Issue on Creep and Fatigue at Elevated Temperatures)
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概要
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For the purpose of studying the creep behavior of orthorhombic Ti_2AlNb (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℃/310 MPa in air, using a dead-weight creep-rupture machine. The activation energy of creep was calculated to be 327 to 416 kJ/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.
- 一般社団法人日本機械学会の論文
- 2002-01-15
著者
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Nakazawa Shizuo
Materials Engineering Laboratory National Institute For Materials Science
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TANG Feng
Materials Engineering Laboratory, National Institute for Materials Science
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HAGIWARA Masuo
Materials Engineering Laboratory, National Institute for Materials Science
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Hagiwara Masuo
Materials Engineering Laboratory National Institute For Materials Science
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Tang Feng
Materials Engineering Laboratory National Institute For Materials Science
関連論文
- Creep Behavior of Orthorhombic Ti_2AlNb Based Intermetallic Alloys(Special Issue on Creep and Fatigue at Elevated Temperatures)
- SB-04-1(003) Creep Behavior of Orthorhombic Ti_2AlNb Based Intermetallic Alloys(Intermetallics and Its Composites)