The invention discloses a high-temperature
softening resistant Cu-Ni-Sn series high-strength and high-elasticity
copper alloy and a preparation method thereof. The
alloy comprises the following components such as Cu, Ni, Sn, Al, Zn, Si or Nb and inevitable
impurity elements, and the contents of Ni, Sn, Al, Zn, Si or Nb elements are as follows: 12-18 wt% of Ni; 4.5-8.5 wt% of Sn; 0.5-2 wt% of Al; 0.3-1.0 wt% of Zn; 0.3-1.0 wt% of Si; and 0-1.0 wt% of Nb. The
alloy preparation process comprises the steps of
smelting, up-drawing
continuous casting, homogenization and
solution treatment, cold deformation treatment and aging treatment. The multi-component Cu-Ni-Sn series
copper alloy prepared through adopting a short-process up-drawing
continuous casting method is small in dendritic
crystal spacing, high-melting-point second-phase particles can be separated out to occupy a
nucleation position of discontinuous
precipitation after large-deformation cold
machining and combined deformation heat treatment processes, recrystallization reaction is promoted, and growth of the discontinuous
precipitation is remarkably inhibited; therefore, the
copper alloy with excellent high-temperature
softening resistance, high strength, high elasticity and
high wear resistance is prepared.