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The influence of hot deformation on the microstructure of Ni-Al and Ni-Al-Fe alloys with small Ti2B addition |
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| Authors: | T. Czeppe and S. Szezepanik |
| Affiliation: | a Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta St., 30-059, Kraków, Poland b University of Mining and Metallurgy, 30 Mickiewicza Av., 30-059, Kraków, Poland |
| Abstract: | Results of microstructure investigation of Ni-Al and Ni-Al-Fe alloys with addition of 0.5at.% Ti2B after hot deformation are presented. Ti partially dissolves in the matrix, promoting formation of a discontinuous phase and precipitates of γ′ phase of Ll2 structure during hot deformation of Ni-Al and Ni-Al-4.3at.%Fe alloys. In all investigated alloys precipitates of different compositions, enriched in Ti, were noticed. A compression test proved that due to the grain boundaries strengthening, the fracture mechanism changes into a transcrystalline one, improving fracture toughness of the hot deformed alloy. Fracture occurs in the deformation induced Ll0 martensite. |
| Keywords: | hot upsetting microstructure fracture NiAl NiAlFe |
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