Abstract
Copper-rich alloys of the ternary system copper-germanium-tin were investigated to determine the equilibrium phase diagrams at 700 °C and 750 °C. Alloys suitable for cold and hot forming for making composite materials between these copper alloys and niobium were selected. By annealing the composite materials between 700 °C and 790 °C, an intermetallic compound containing the A 15-phase was produced. The transition temperature and the critical current flow of the Nb 3Sn layers show that both values can be increased by the addition of 0.5% germanium to a CuSn 15 alloy. In composite materials of alloys with a content of germanium higher than 0.5%, the intermetallic compound of the A 15 phase (Nb 4Ge) prohibits the formation of the A 15 intermetallic compound Nb 3Sn. The critical current of the pure Nb 3Sn −diffusion layer is much less than that of the Nb 3Sn layer containing germanium.
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