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On the mechanisms of high-temperature intergranular embrittlements of Ni3Al-Zr Alloys

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Abstract

Recent studies on the room-temperature fracture behavior of Ni3Al-Zr alloys after preexposure at elevated temperatures show various types of intergranular failure. In the presently studied Ni78Al21Zr1B0.2 alloy, a strong intergranular fracture tendency at room temperature has been found after preexposure at 750 °C, which is caused by the grain boundary precipitation in this alloy. After short-term exposure above 1200 °C and bending fracture at room temperature, the alloy also suffers intergranular embrittlement due to grain boundary melting. The intergranular fracture appearance is quite different from that observed in a previous study for a Ni77.4Al22Zr0.6B0.2 alloy after air exposure for 100 hours at 1200 °C. In that case, the intergranular fracture was accompanied by grain boundary diffusion (invasion) and segregation of oxygen. The mechanisms of these types of grain boundary failure are discussed.

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Authors and Affiliations

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

    T. H. Chuang (Professor)

  2. Chung-Shan Institute of Science and Technology, Taoyuan, Taiwan, Republic of China

    Y. C. Pan (Associate Scientist)

Authors
  1. T. H. Chuang
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  2. Y. C. Pan
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Formerly Doctoral Candidate, Institute of Materials Science and Engineering, National Taiwan University.

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Chuang, T.H., Pan, Y.C. On the mechanisms of high-temperature intergranular embrittlements of Ni3Al-Zr Alloys. Metall Trans A 23, 1187–1193 (1992). https://doi.org/10.1007/BF02665050

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