Multicomponent Designed Of Cu-Ni-Sn Alloys Cluster Formula With High Elastic

As an environmental elastic and conductive Cu alloys,the Cu-Ni-Sn alloy has high strength and conductivity,excellent high temperature stress relaxation resistance,heat conductive stability and corrosion resistance.The widely used in various electronic elastic components,and its strength has a strength of up to 1300 MPa(comparable to Cu-Be alloys).Cu-Ni-Sn alloys has disadvantages,such as the segregation of Sn and discontinuous precipitate during aging,which will seriously affect the strength and processing properties.In order to solve these problems,Cu-Ni-Sn-Co alloys were designed with Co element as the fourth and compared with the Cu-Ni-Sn-Zn alloys in the research results.Cu-Ni-Sn-Zn-Si alloys are designed based on the optimized cluster,it's existence state of trace element,composition uniformity,hardness and electrical properties were studied.The comprehensive properties of the designed alloy were evaluated.the following conclusions could be drawn:Co is distributed in matrix and precipitates as substitutional solutes,which can decrease solidus-liquidus temperature range and inhibit discontinuous precipitation and segregation of Sn with the increase of content,the hardness of Cu₈₀Ni₁₅Sn_4.375Co_0.625 alloy aged for five hours was better than Cu₈₀Ni₁₅Sn₅ alloy and the electrical condutivity is low than the latter.Zn is completely dissolved in the Cu matrix in the form of clusters and shows more obvious performance improvement,heat conductive stability and more significant inhibition of segrigation.Due to the solid solution of Ni in the Cu matrix,and the presence of Cu element in the??phase,the main cluster of matrix,DO₂₂-??and L1₂-??phase were modified.{[Cu-Cu₁₂]Cu₃}_x{[Sn-Ni₁₂]Sn₃}was modified to{[Cu-Cu_xNi_12-x]Cu₃}_a{[Sn-Ni_yCu_12-y]Sn₃}_16-aand Cu_79.68Ni_15.63Sn_4.69 alloy was designed based on C72900(Cu_78.96Ni_16.65Sn_4.39,at.%),which has a composition to the C72900 than Cu₈₀Ni₁₅Sn₅alloy.A series of Cu-Ni-Sn-Zn-Si alloys were desgned by adding Zn and Si based on cluster model after modified.The results of microstructure analysis show that Zn and Si are solidly dessolved in alloys.The addition of Zn and Si significantly inhibits the formation of Sn segregation and discontinuous precipitates in the as-cast and aged alloys.The work founction,hardness,conductivity and The resistivity-temperature behavior of alloys were investigated,the results show that the synergistic effect of Zn and Si can inhibit the segregation and improve the harness,electrical conductivity and heat conductive stability compared with Cu-Ni-Sn alloys.The performance of Cu-Ni-Sn-Zn-Si alloys are compared with those typical Cu-Ni-Sn and Cu-Be alloys,the results show that the Cu₈₀Ni₁₅Sn₅ alloy and Cu_79.68Ni_15.63Sn_4.69 designed by the cluster-plus-glue-atom model has better properties than those of the C72900commercial alloy in the same heat treatment condition.The hardness of alloys with Zn and Si added were better than Cu-Be in the same heat treatment condition(Cu₈₀-Zn_0.185Si_0.15 has best performance),and the segregation and discontinuous orecioitation in Cu-Ni-Sn alloy is effectively improved.