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Structure/Property Relationships in a Rapidly Solidified and Annealed Ternary Iron Aluminide

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Abstract

Rapidly solidified strips of Fe66.5-Al28.5-Cr5 alloy with the addition of 0.5wt.% TiB2, were produced by planar flow strip casting. Correlations of the microstructure and room temperature mechanical properties were made for strips in the as-cast condition and after annealing at 1273K for periods up to 4hrs. The results showed that grain size, tensile strength, ductility, hardness and Young's modulus were very stable for the times investigated. Studies of tensile fracture surfaces revealed essentially 100% transgranular cleavage in the ascast strip with a greater tendency for intergranular failure after prolonged exposure to high temperatures. TEM studies of this alloy revealed diffraction patterns characteristic of DO3 ordering but the dislocations observed in both ascast and deformed specimens were those typical of the B2 structure without any extended APBs. This is attributed to the very fine DO3, domain size. At room temperature <111> slip is predominant.

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Authors and Affiliations

  1. CNRS, Métallurgie Structurale, Bât. 413,Université Paris-sud, 91405, Orsay, France

    B. Décamps

  2. CSIRO, Div. of Materials Science and Technology, Clayton, Vic., 3168, Australia

    M. A. Gibsont & A. J. Morton

  3. Texas A&M University, Advanced Mats. Lab., College Station, TX, 77843-3123, USA

    A. Wolfenden

Authors
  1. B. Décamps
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  2. M. A. Gibsont
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  3. A. J. Morton
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  4. A. Wolfenden
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Décamps, B., Gibsont, M.A., Morton, A.J. et al. Structure/Property Relationships in a Rapidly Solidified and Annealed Ternary Iron Aluminide. MRS Online Proceedings Library 213, 685–690 (1990). https://doi.org/10.1557/PROC-213-685

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  • DOI: https://doi.org/10.1557/PROC-213-685

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