High-Temperature Mechanical Properties of B2 Type IrAl Intermetallic Compounds Doped with Ni

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  • Ono T.
    Department of Materials Science and Technology, Faculty of Engineering, Iwate University
  • Chiba A.
    Department of Materials Science and Technology, Faculty of Engineering, Iwate University
  • Li X. G.
    Department of Materials Science and Technology, Faculty of Engineering, Iwate University
  • Takahashi S.
    Department of Materials Science and Technology, Faculty of Engineering, Iwate University

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  • High-Temperature Mechanical Properties

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Abstract

Compression tests have been conducted to examine the mechanical behavior of polycrystalline Ir1−xNixAl intermetallic compounds with x=0 to 0.8 at elevated temperatures. The crystal structure of the Ir1−xNixAl compounds has been determined to be a B2 type ordered structure by X-ray analyses. Although IrAl fractures without exhibiting appreciable yielding at temperatures up to 873 K, a steady state-like deformation in IrAl takes place at temperatures higher than approximately 1273 K. Ductility of Ir1−xNixAl is improved with increasing x. On the contrary, the strength decreases with increasing x in the intermediate temperature range. The IrAl alloy exhibits the 0.2% flow stress of 1200 MPa at 1073 K and 350 MPa at 1473 K, having the negative temperature dependence of the strength. Further more, the specific strength of Ir1−xNixAl is almost independent of x at temperatures higher than approximately 1473 K. The 0.2% flow stress and the specific 0.2% flow stress of Ir0.2Ni0.8Al is significantly higher than that of binary NiAl over the entire temperature range to 1673 K.

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