摘要
利用微合金化法设计了引线框架用Cu-Fe-P合金的成分(Cu-2.5Fe-0.12Zn-0.03P-0.05Mg-0.05Cr-0.05RE),采用金相显微镜(OM)和高分辨电子显微镜(HRTEM)研究了合金的微观组织,测定了合金的抗拉强度、伸长率及电导率等性能。试验结果表明,在其他试验条件相同的情况下,冷轧后的合金板材经550℃×4h时效后处于过时效状态,球形的析出相γ-Fe粗化,尺寸在50～100nm的范围,合金的强度为482MPa,显微硬度HV为161,电导率为39.7MS/m;经450℃×4h时效后处于欠时效状态,呈球形的γ-Fe相尺寸在20nm以下,抗拉强度为417MPa,显微硬度HV为139,电导率是30.4MS/m;经550℃×2h+450℃×2h时效后处于峰值时效状态,球形的γ-Fe相尺寸在20～50nm的范围,此时合金的抗拉强度为510MPa,显微硬度HV为168,导电率为40.6MS/m。
The composition of Cu-Fe-P alloy(Cu-2.5Fe-0.12Zn-0.03P-0.05Mg-0.05Cr-0.05RE)was designed by micro-alloying method.Microstructure of the alloy was observed by OM(optical microscope)and HRTEM,and tensile strength,elongation and electric conductivity of the alloy were examined.The results reveal that at a given experiment condition,the cold rolled alloy plates after aging at 550 ℃ for 4 h exhibit overages,in which spheroidal precipitates γ-Fe are coarsened with size in range of 50 to 100 nm,and the tensile strength,micro-hardness and electric conductivity of alloy are 482 MPa,161 and 39.7 MS/m,respectively,while the alloy exhibits under-ages after aging at 450 ℃ for 4 h,in which the size of shperoidal precipitates γ-Fe is lower than 20 nm,and tensile strength,micro-hardness and electric conductivity are 417 MPa,139 and 30.4 MS/m,respectively The alloy exhibits peak ages after aging at 550 ℃ for 2 hours and 450 ℃ for 2 hours,in which size of spheroidal precipitates γ-Fe is in range of 20 to 50 nm,and the tensile strength,micro-hardness and electric conductivity of alloy are 510 MPa,168 and 40.6 MS/m,respectively.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2007年第12期975-978,共4页
Special Casting & Nonferrous Alloys
基金
中铝科技发展基金项目(2004KJA10)
