【摘要】 采用中频感应熔炼炉制备了Cu-0.7Cr-0.15Zr和Cu-0.7Cr-0.15Zr-0.05Mg-0.02Si两种合金,研究了Mg、Si复合微合金化对Cu-Cr-Zr合金时效工艺参数、性能与析出动力学的影响。结果表明:Mg、Si复合微合金化提高了Cu-Cr-Zr合金的最佳时效温度,延长了保温时间,Cu-0.7Cr-0.15Zr合金的最佳时效工艺为410℃时效8 h,Cu-0.7Cr-0.15Zr-0.05Mg-0.02Si合金的最佳时效工艺为430℃时效14 h。Mg、Si复合微合金化提高了Cu-Cr-Zr合金的抗拉强度与导电率,Cu-0.7Cr-0.15Zr合金最佳工艺条件下的强度为570 MPa、电导率为79.1%IACS;Cu-0.7Cr-0.15Zr-0.05Mg-0.02Si合金最佳时效工艺条件下的抗拉强度为595 MPa、电导率为80.4%IACS。Mg、Si复合微合金化改变了Cu-Cr-Zr合金Avrami相变动力学方程,减缓了时效析出过程。更多还原

【Abstract】 Two kinds of alloy Cu-0. 7Cr-0. 15Zr and Cu-0. 7Cr-0. 15Zr-0. 05Mg-0. 02Si were prepared by the medium frequency induction melting furnace. The influence of Mg,Si composite microalloying on Cu-Cr-Zr alloys aging process parameters,properties and precipitation kinetics were studied. The results show that the Mg and Si composite microalloying can increase the best aging temperature of Cu-Cr-Zr alloy,and prolong the aging time. The optimum aging process of Cu-0. 7Cr-0. 15Zr alloy is 410 ℃ for 8 h,and the optimum aging process of Cu-0. 7Cr-0. 15Zr-0. 05Mg-0. 02Si alloy is 430 ℃ for 14 h. Mg and Si composite microalloying can improve tensile strength and electric conductivity of the Cu-Cr-Zr alloy. Under the optimum aging process,the strength of Cu-0. 7Cr-0. 15Zr alloy is 570 MPa and the conductivity is 79. 1% IACS,and the tensile strength of Cu-0. 7Cr-0. 15Zr-0. 05Mg-0. 02Si alloy is 595 MPa and the conductivity is 80. 4% IACS. Mg and Si composite microalloying can change the Avrami phase transformation kinetics equation of Cu-Cr-Zr alloy and slow down the aging precipitation process.更多还原