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High temperature creep in a semi-coherent NiAl-Ni2AlTi alloy

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Abstract

Creep experiments have been made on a Ni-Ti-Al alloy, which has a microstructure consisting of a distribution of semi-coherent NiAl(β) precipitates with a Ni2AlTi(β′) Heusler phase matrix. The creep strength of this bcc type structure alloy is at least comparable with that of the nickel-base superailoy MARM-200 for values ofT/T m in the range 0.68 to 0.82. Quantitative electron microscope experiments show that both undissociated α0〈110〉 dislocations, and paired α0〈100〉 dislocations coupled by a sublattice A.P.B. exist within the β′ phase;α 0 is the lattice parameter of a bcc cell of which the large Ni2AlTi unit-cell is composed. The sublattice A.P.B. is a crystallographic fault created by wrong bonds between atoms on the Al-Ti sublattice. Theoretically the energy γ of a sublattice A.P.B. is shown to be minimum on {100}, and the experimental value for γ on {100} is ~40 mJ/m2.

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Authors and Affiliations

  1. Department of Metallurgy, University of Connecticut, 06268, Storrs, Connecticut

    R. S. Polvani (Research Associate) & P. R. Strutt (Associate Professor)

  2. Firestone Tire and Rubber Co., Akron, Ohio

    Wen-Shian Tzeng (Research Scientist)

Authors
  1. R. S. Polvani
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  2. Wen-Shian Tzeng
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  3. P. R. Strutt
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Polvani, R.S., Tzeng, WS. & Strutt, P.R. High temperature creep in a semi-coherent NiAl-Ni2AlTi alloy. Metall Trans A 7, 33–40 (1976). https://doi.org/10.1007/BF02644036

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  • DOI: https://doi.org/10.1007/BF02644036

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