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824 |
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Poster Presentation Fügen von Hochleistungswerkstoffen Joining of high performance materials |
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Brazing composite intermetallic TiAl with structural materials. |
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oleg sevryukov / moscow engineering physics institute (state university), russia Vladimir Fedotov / Moscow Engineering Physics Institute (State University), Russia Boris Kalin/ Moscow Engineering Physics Institute (State University), Russia Maksim Golikov/ Moscow Engineering Physics Institute (State University), Russia |
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The intermetallic alloys based on a titanium aluminide have a high strength, a low specific weight, and a chemical and thermal stability. Owing to a similar combination of physical and chemical properties, the given type of materials can be considered as structural materials for different applications.To estimate the possibility of using this intermetallic alloy as a structural material, brazed joints of Ti-48at.%Al with bronze and titanium alloy were produced. Brazing was carried out by the STEMET 1202® filler metal of the Ti-Cu-Zr-Ni-V-Be system in vacuum (at the pressure less than 10-5 mm Hg), at the temperature of 850оC for 15 min. Metallographic investigations of the samples have shown that under the given regimes of compacting, compression of the powders takes place with a slight plastic deformation of the largest granules. The impregnation of the powder matrixes makes it possible to effectively eliminate the residual porosity. The distribution of chemical elements in the brazed seam was investigated by X-ray spectrum analysis. It has been found that the distribution of the main and doping elements is sufficiently uniform in the contact zone of the filler metal with brazed materials; inclusions, cracks, and delamination are absent. |