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

TungHan Chuang | Zendy; Yicheng Pan | Zendy

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

Author(s) -

TungHan Chuang,

Yicheng Pan

Publication year - 1992

Publication title -

metallurgical transactions a

Language(s) - English

Resource type - Journals

eISSN - 2379-0180

pISSN - 0360-2133

DOI - 10.1007/bf02665050

Subject(s) - intergranular corrosion , grain boundary , intergranular fracture , materials science , embrittlement , metallurgy , alloy , precipitation , fracture (geology) , composite material , microstructure , physics , meteorology

Recent studies on the room-temperature fracture behavior of NiAl-Zr alloys after preexposure at elevated temperatures show various types of intergranular failure. In the presently studied NiAlZrB 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 NiAlZrB 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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