Abstract
In this study, Cu-5Ni-10Sn(wt%) spinodal alloy was manufactured by gas atomization spray forming, and the microstructural features and mechanical properties of Cu-5Ni-10Sn alloy have been investigated during homogenization, cold working and age-hardening. The spray formed Cu-5Ni-10Sn alloy consisted of an equiaxed microstructure with a mixture of solid solution <TEX>${\alpha}$</TEX>-(CuNiSn) grains and lamellar-structure grains. Homogenization at <TEX>$800^{\circ}C$</TEX> and subsequent rapid quenching formed a uniform solid solution <TEX>${\alpha}$</TEX>-(CuNiSn) phase. Direct aging at <TEX>$350^{\circ}C$</TEX> from the homogenized Cu-5Ni-10Sn alloy promoted the precipitation of finely distributed <TEX>${\gamma}$</TEX>' or <TEX>${\gamma}-(Cu,Ni)_3Sn$</TEX> phase throughout the matrix, resulting in a significant increase in microhardness and tensile strength. Cold working prior to aging was effective in strengthening Cu-5Ni-10Sn alloy, which gave rise to a maximum tensile strength of 1165 MPa. Subsequent aging treatment slightly reduced the tensile strength to 1000-1100 MPa due to annealing effects.
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