Cu-Ni-Sn-P合金中Sn和Ni元素对其综合性能的影响OA

In this study,Cu-Ni-Sn-P(C19040)alloy strip materials with different compositions were prepared by horizontal continuous casting followed by multiple cold rolling and heat treatment processes.Effects of Sn and Ni mass fraction variations on the mechanical properties,softening resistance,and thermal contraction of Cu-Ni-Sn-P alloy strip materials were investigated.Results indicated that an increase in Sn mass fraction enhanced mechanical properties and softening resistance of Cu-Ni-Sn-P alloy through solid solution strengthening.However,excessive Sn mass fraction exacerbated Sn segregation,which worsened the thermal contraction behavior.An increase in Ni mass fraction promoted the formation of more Ni-P precipitates,significantly improving the softening resistance.When mass fraction of Sn was 1.5%and that of Ni was 0.85%,the alloy exhibited superior comprehensive properties,with a hardness of 174HV,tensile strength of 565 MPa,elongation of 4.3%,thermal contraction rate of 0.006%,and softening resistance hardness of 141HV.These properties met the requirements for lead frame materials.