Abstract
The phase equilibria of the Cu–Nb–Ti system at 850 °C were investigated by a high-efficiency diffusion couple approach. The samples were studied by means of optical microscopy, scanning electron microscopy and electron probe microanalysis. At 850 °C, the phase TiCu 2, the stability range of which is controversial in the literature, was observed. The solubilities of Nb in Ti 2Cu, TiCu and Ti 3Cu 4 were determined to be 3.5, 3.1 and 4.6 at.%, respectively. The solubility of Nb in TiCu 4 was negligibly small. The following three-phase equilibria were observed: Ti 2Cu + TiCu + (Nb,Ti), TiCu + Ti 3Cu 4 + (Nb,Ti) and Ti 3Cu 4 + TiCu 4 + (Nb,Ti).
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