Summary
The methods of metallographic, thermographic, x-ray diffraction, and microhardness analyses were used for studying alloys of the system titanium-copper in the concentration range 20–100 at. % Cu. On the basis of the results obtained and literature data, the phase diagram of the system Ti-Cu was plotted.
It is shown that the system has six intermetallic compounds, of which Ti2Cu, TiCu, and TiCu4 are variable-composition phases with narrow regions of homogeneity.
The existing data on the crystalline structures of the phases based on Ti2Cu, TiCu, Ti3Cu4 and TiCu2 have been confirmed and the space group of the phase based on Ti2Cu3 has been determined. It is shown that the intermediate phase with the highest copper content has the formula TiCu4 and a crystalline lattice with a rhombic cell containing 20 atoms.
The compounds Ti2Cu and TiCu melt congruently at 1015 and 984° C, respectively, while the compounds Ti3Cu4, TiCu2, and TiCu4 form from the melt by peritectic reactions at 918, 878, and 870° C, respectively. TiCu2 exists only at high temperatures and decomposes at 850° C into TiCu4 and Ti2Cu3. The compound Ti2Cu3 exists below 865° C and forms either at that temperature by the reaction TiCu2 + Ti3Cu4 → 2Ti2Cu3 or at 850° C as a result of the decomposition of the compound TiCu2.
The coordinates of the three eutectics in this system are: Theβ-Ti + Ti2u eutectic occurs at 1003° C and 31 at. % Cu, the Ti2Cu+TiCu eutectic at 960° C and 43 at. %Ce, and the TiCu2 + TiCu4 eutectic at 860° C and 73 at. % Cu.
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Eremenko, V.N., Buyanov, Y.I. & Prima, S.B. Phase diagram of the system titanium-copper. Powder Metall Met Ceram 5, 494–502 (1966). https://doi.org/10.1007/BF00775543
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DOI: https://doi.org/10.1007/BF00775543