引线框架用铜合金C194热处理工艺研究

Study on heat treatment process of C194 copper alloy for lead frame

利用常温拉伸试验、电导率测试、金相显微镜和透射电镜等手段研究了固溶处理和时效工艺对铜合金C194组织和性能的影响。结果表明,合金板材在875℃×60 m in处理后得到充分固溶,通过70%冷轧变形再经500℃×5 h时效处理后,合金的抗拉强度达到512 MPa,电导率达77.8%IACS。合金在500℃时效初期Fe3P颗粒沿位错和晶界析出,且尺寸较小,分布均匀,时效5 h后,合金基体上析出了大量弥散均匀分布的γ-Fe和Fe3P相,从而大大提高了合金的强度和电导率。

The effects of solution and ageing treatment on the microstructure and properties of C194 copper alloy were studied. The results show that the alloy plate is saturated after solution treatment at 875 ℃ for 60 rain,followed by 70% cold rolling and ageing treatment at 500 ℃ for 5 h,the tensile strength and electrical conductivity of the alloy are 512 MPa and 77.8% IACS respectively. Early ageing stage at 500 ℃ ,finer and disperse Fe3P particles are precipitated along the dislocation and grain boundries ,when ageing for 5 h, many disperse γ-Fe and Fe3 P phases precipitate from Cu matrix ,thus improves tensile strength and electrical conductivity of the alloy.