冷轧变形对高性能Cu-Ni-Si合金组织性能与析出行为的影响

Effect of Cold-Rolling Deformation on Microstructure,Properties,and Precipitation Behavior of High-Performance Cu-Ni-Si Alloys

采用DSC、TEM、导电率和力学性能等测试方法,研究了不同冷轧变形量对Cu-3.0Ni-0.60Si-0.16Zn-0.15Cr-0.03P(质量分数,%)合金组织性能与析出行为的影响,旨在通过工艺调控提升该合金的综合性能。通过对比不同冷轧变形后合金的开始析出温度和再结晶温度以及时效后合金的组织性能,确定了高性能Cu-NiSi系合金的形变-时效工艺参数,明确了冷轧变形量对合金时效析出动力学的影响规律和强化相析出的调控机制;合金经过95%冷轧+450℃、60 min形变热处理后获得了显著优于现有Cu-Ni-Si合金(如C70250)的性能,其抗拉强度为(841±10)MPa,导电率为(52.2±0.3)%IACS。

The advancement of integrated circuit manufacturing process and chip packaging technology has improved the performance requirements for lead frame copper alloy.In the field of high-performance copper alloys,balancing and improving mechanical and electrical conductivity(EC)has been a challenge.This work investigates the effect of different cold-rolling deformations(0,65%,75%,85%,and 95%)on the microstructure,properties,and precipitation behavior of Cu-3.0Ni-0.60Si-0.16Zn-0.15Cr-0.03P alloy to enhance its comprehensive performance through process control.The deformation-aging process parameters of high-performance Cu-Ni-Si alloys were determined by comparing the precipitation and recrystallization initial temperatures,microstructures,and properties of the samples after aging.The effect of cold-rolling deformation on precipitation kinetics and mechanism was studied.By optimizing the process parameters,the properties of the alloy are observed to be better than the existing Cu-Ni-Si alloys after 95%cold-rolling deformation and aging at 450oC for 60 min,with an ultimate tensile strength of(841±10)MPa,and an EC of(52.2±0.3)%IACS.This work's relevant research findings can provide theoretical reference and data support for realizing the comprehensive property enhancement of high-performance copper alloys.