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Grain boundary pest of boron- doped Niin3Al at 1200 °C

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Abstract

A ductile Ni77.4Al22Zr0.6B0.2 alloy suffered severe intergranular embrittlement after air exposure at 1200 °C for 100 hours. However, the material survived after 1038 °C air exposure for 100 hours. Auger analysis showed enormous oxygen segregation on the grain boundaries in the 1200 °C, air exposed, boron-doped Ni3Al, while the boron segregation remained unchanged. To elucidate this type of grain boundary damage, a modified fracture mechanism was proposed. Finally, anomalous grain growth was found in this alloy after 1200 °C air exposure, and an explanation for this phenomenon was suggested.

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Authors and Affiliations

  1. Graduate Institute of Materials Engineering, National Taiwan University, Taipei, Taiwan, Republic of China

    T. H. Chuang (Professor), Y. C. Pan (Doctoral Candidate) & S. E. Hsu (Professor)

Authors
  1. T. H. Chuang
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  2. Y. C. Pan
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  3. S. E. Hsu
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Chuang, T.H., Pan, Y.C. & Hsu, S.E. Grain boundary pest of boron- doped Niin3Al at 1200 °C. Metall Trans A 22, 1801–1809 (1991). https://doi.org/10.1007/BF02646504

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  • DOI: https://doi.org/10.1007/BF02646504

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