Ni含量对Cu-Ni-Ag合金固溶强化行为的影响

Effect of Ni content on the solid solution strengthening behavior of Cu-Ni-Ag alloys

设计不同Ni含量的Cu-Ni-Ag合金成分,将空气熔炼加气雾化法制备的合金粉末经热压制备成合金块体,随后进行轧制及退火。结果表明:通过成分和组织优化,成功制备了具有较高强度和良好塑性的Cu-Ni-Ag合金。Cu-Ni-Ag合金的强化机制以固溶强化和位错强化为主。Ni导致Ag在合金中的固溶度降低,但固溶强化作用显著;富Ag析出相的数量随Ni含量增加而增加;Ag析出相可在晶界钉扎和阻碍位错运动,从而提高合金的室温强度。

In this paper,different Ni elements were added in the Cu-Ni-Ag alloy,and gas atomized alloy powders were used to manufacture bulk sample by hot pressing,rolling and annealing.The results indicated that the Cu-Ni-Ag alloy with high strength and good plasticity has been successfully fabricated by composition and microstructure optimization.The main strengthening mechanisms of Cu-Ni-Ag alloy are solution strengthening and dislocation strengthening.The solution strengthening effect of Ni is significant,but the solution solubility of Ag in the alloy is reduced by Ni.The number of Ag-rich precipitates increases with the increase of Ni content.The precipitated phase can further enhance the strength by pinning grain boundaries and impeding dislocation movement.