本发明涉及一种铜合金及其制备方法和应用。本发明的铜合金，通过Zn、Fe、Cr、Sn、Si和Mg 之间的相互作用，可以在铜基体中引入多种强化 相，使合金元素以高硬度、高耐热的纳米级FeSi 和Cr相颗粒充分弥散析出，强化析出相颗粒和位 错之间的交互作用，实现了多相协同弥散强化、 应变强化、亚晶强化和固溶强化的综合强化作 用，同时提高了铜合金的综合性能，解决了现有 铜合金的强度、导电性能、抗软化性能、低残余应 力难以兼顾和匹配的问题。本发明还提供了上述 铜合金的制备方法和由上述铜合金制备的蚀刻 型引线框架。

The present invention relates to a copper alloy and a preparation method and application thereof. The copper alloy of the present invention, through the interaction between Zn, Fe, Cr, Sn, Si and Mg, can introduce a variety of strengthening phases into the copper matrix, so that the alloying elements are fully dispersed and precipitated with nanoscale FeSi and Cr phase particles with high hardness and high heat resistance, and the interaction between the precipitated phase particles and dislocations is strengthened, and the comprehensive strengthening effect of multi-phase synergistic dispersion strengthening, strain strengthening, subcrystalline strengthening and solid solution strengthening is realized, and the comprehensive properties of copper alloys are improved, and the strength and conductivity of existing copper alloys are solved , softening resistance, low residual stress is difficult to balance and match. The present invention also provides a method for preparing the copper alloy and an etched lead frame prepared by the copper alloy.