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Effect of grain shape on environmental embrittlement in Ni3Al tested at elevated temperatures

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Abstract

This paper describes the effect of grain shape on environmental embrittlement in boron-doped Ni3Al (24 at. % Al). The alloy showed severe embrittlement when tested at 600 and 760 °C in air. The embrittlement can be alleviated by control of grain shape, and the material with a columnar-grained structure produced by directional levitation zone remelting shows good tensile ductilities when tested in oxidizing environments. The columnar-grained structure with vertical grain boundaries minimizes the normal stress and consequently suppresses nucleation and propagation of cracks along the boundaries.

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Authors and Affiliations

  1. Metals and Ceramics Division, Oak Ridge National Laboratory, Tennessee, 37831-6115, Oak Ridge, USA

    C. T. Liu

  2. Materials Science and Engineering Department, The University of Tennessee, Tennessee, 37996-2200, Knoxville, USA

    B. F. Oliver

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  1. C. T. Liu
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  2. B. F. Oliver
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Liu, C.T., Oliver, B.F. Effect of grain shape on environmental embrittlement in Ni3Al tested at elevated temperatures. Journal of Materials Research 4, 294–299 (1989). https://doi.org/10.1557/JMR.1989.0294

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  • DOI: https://doi.org/10.1557/JMR.1989.0294

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