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通过非真空熔炼制备了Cu-0.13Cr-0.074Ag合金,合金试样经870℃固溶处理1 h后淬火,冷轧至加工变形量分别为40%,60%和90%,然后分别在440℃,480℃和520℃时效处理15 min~6 h。利用显微硬度测量,电导率测量和透射电镜观察等手段研究了合金在不同的形变热处理工艺处理下的性能和组织结构的变化规律。结果表明形变热处理可显著提高Cu-0.13Cr-0.074Ag合金的综合性能,合金在870℃固溶1h,冷轧40%,480℃时效2 h后力学性能和电学性能达到良好匹配,合金硬度,抗拉强度,屈服强度和延伸率分别为127 HV,405 MPa,303 MPa和11.2%,电导达到97.31%IACS;在480℃时效过程中,合金首先析出有序的fcc结构的Cr相,随时效时间的延长,第二相转变为具有B2(或Heusler)结构的有序bcc Cr相,与基体存在N-W位向关系。
The alloy Cu-0.13Cr-0.074Ag was prepared by non-vacuum melting. The alloy was quenched and solution-treated at 870 ℃ for 1 h and then quenched to 40%, 60% and 90% ℃, 480 ℃ and 520 ℃ for 15 min ~ 6 h. The microstructure and mechanical properties of the alloys were investigated by means of microhardness measurement, conductivity measurement and transmission electron microscope observation. The results show that the mechanical properties and electrical properties of the Cu-0.13Cr-0.074Ag alloy can be significantly improved by the heat treatment of deformation. The alloy has good mechanical and electrical properties after solution treatment at 870 ℃ for 1h, cold-rolled 40% and 480 ℃ for 2 h. The tensile strength, yield strength and elongation were 127 HV, 405 MPa, 303 MPa and 11.2%, respectively. The conductivity reached 97.31% IACS. In the aging process at 480 ℃, the alloy first precipitated the ordered fcc Cr phase, As the time prolongs, the second phase transforms into an ordered bcc Cr phase with a B2 (or Heusler) structure with an NW orientation to the substrate.