Beschreibung:
The effect of Si addition (0.2 wt%) on the precipitation evolution, hardness and electrical conductivity of Cu-2.2Ni-0.4Be alloy were investigated, and the influencing mechanism was also discussed. The results show that Si can not only form γ phase with Ni, but also promote the nucleation and refine the size of NiBe phase, which increases the peak hardness from 282.3 HV to 308.2 HV. In addition, Si suppresses the NiBe phase coarsening under the over-aged condition, resulting in a much slower hardness decline during the long time aging. Meanwhile, the electrical conductivity shows a slight decrease with Si addition, which is mainly attributed to the extra electronic scattering effect induced by the partial solution of Si