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本文在Cu-Cr-Zr合金中加入了微量Si元素，并改变Cr元素占比，制备了两种具有不同Cr元素含量的Cu-Cr-Zr-Si合金（合金1~#:Cu-0.31Cr-0.20Zr-0.03Si和合金2~#:Cu-0.56Cr-0.20Zr-0.03Si），研究了在相同形变热处理工艺下两种合金力学-电学性能的变化。结果表明：经970℃固溶处理1 h+80%变形量室温轧制+450℃峰时效处理后，合金1~#的硬度和电导率分别为HV 204和71.4%IACS，合金2~#的硬度和电导率分别为HV 208和72.6%IACS，在Cu-Cr-Zr-Si合金中适量增加Cr元素可以提高合金的综合性能。对合金2~#在400～650℃（间隔50℃）下分别进行0, 0.5,1, 2, 3, 4, 5, 6, 8, 10和12 h时效处理，并根据Cu-Cr-Zr-Si合金电导率与新相转变率的关系对合金2~#的时效析出动力学进行了研究，得到了其在不同时效温度下的Avrami析出动力学方程和电导率方程，并绘制出了等温转变动力学S曲线和TTT曲线。
Abstract：With the rapid rise of the microelectronics industry, integrated circuits are gradually developing in the direction of miniaturization and intelligence. This puts forward higher requirements for lead frame materials, including high strength, high conductivity, corrosion resistance and so on. In this study, the properties of Cu-Cr-Zr-Si alloy and its aging precipitation kinetics were studied, which would provide a basis for controlling the microstructure and properties of Cu-Cr-Zr-Si alloy. Adding Si to Cu-Cr-Zr alloy could refine the grain but excessive Si would cause the decrease of the conductivity. Therefore, in this study, a small amount of Si was selected to be added, and two kinds of alloys with different chemical composition of Cr, Alloy 1) and Alloy 2~#(Cu-0.56 Cr-0.20 Zr-0.03 Si), were prepared. Firstly, Alloy 2~# solid solution alloy was rolled at 80% room temperature and aged at different temperatures(400, 450 and 500 ℃). The variation of hardness and conductivity of the alloy with aging process was observed, and the optimum aging temperature was determined. Then, the hardness and conductivity of the two alloys with different compositions were measured at the optimum aging temperature, and the effects of different Cr content on the comprehensive properties of the alloys were compared. Finally, the aging methods of Alloy 2~# alloy was applied at 400, 450, 500, 550, 600 and 650 ℃ for 0, 0.5, 1, 2, 3, 4, 5, 6, 8, 10 and 12 h, respectively. The aging precipitation kinetics of Alloy 2~# was studied according to the relationship between the electrical conductivity and the new phase transformation rate of Cu-Cr-Zr-Si alloy. Avrami precipitation kinetics equation and electrical conductivity equation of Alloy 2~# at different aging temperatures were obtained, and the isothermal transformation kinetics S curve and TTT curve was plotted, which provided methods for controlling the microstructure and properties of Cu-Cr-Zr alloy. The experimental results showed that the hardness of Alloy 2~# increased rapidly with the increase of aging time while decreased gradually after reaching the peak value. The electrical conductivity of Alloy 2~# increased rapidly at the initial stage and reaches a higher level after aging for 1 h, and then slowly increased with the further increased aging time. In addition, the conductivity of Alloy 2~# increased significantly with the increase of aging temperature. It was considered that the hardness and conductivity of supersaturated solid solution increased rapidly at the initial stage of aging because of the high solute concentration and high precipitation driving force in supersaturated solid solution. With the aging process, the solute content in the matrix and the precipitation rate simultaneously decreased, which induced the hardness and conductivity curve increased slowly. In addition, the increase of aging temperature made the solute atoms in the matrix get enough energy to precipitate from the matrix, which improved the conductivity of the alloy. However, the increase of aging temperature also accelerated the diffusion rate of solute atoms and promoted e segregation of solute atoms, promoting the coarsening of precipitated phase, and then led to the weakening of precipitation strengthening effect. According to the above experiments, a heat treatment system(solution treatment at 970 ℃ for 1 h+rolling at room temperature with 80% deformation+peak aging treatment at 450 ℃) was selected. At 450 ℃, the hardness and conductivity of Alloy 1~# and Alloy 2~# had the same trend with the increase of aging time, but the peak hardness(208 HV) of Alloy 2~# was slightly higher than that of Alloy 1~#(HV 204), and their conductivity was not significant difference. Cr content in Alloy 2~# was higher than that in Alloy 1~#, and the precipitation strengthening effect was enhanced with the increase of Cr content, so the hardness value of Alloy 2~# was higher. For Alloy 1~# and Alloy 2~#, there was little difference in solubility of solute elements in copper matrix at 450 ℃, so the conductivity curves basically coincided. According to experimental results, it was found that the comprehensive properties of Cu-CrZr-Si alloy could be improved by increasing appropriate Cr content. After solution treatment, room temperature rolling, the peak aging of Alloy 1# appeared at aging time of 1 h(aging temperature of 450 ℃), and the hardness and conductivity of the alloy were HV 204 and 71.4%IACS, respectively. The peak aging of Alloy) appeared at aging time of 2 h, at which time the hardness was HV 208 and the conductivity was 72.6%IACS. The precipitation kinetics and conductivity of Alloy 2~# during aging treatment at 400～650 ℃ were obtained by Avrami empirical equation, and the isothermal transformation kinetics S curve and TTT curve were drawn.
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基本信息:
DOI：10.13373/j.cnki.cjrm.XY23100037
中图分类号:TG146.11;TG156
引用信息:
[1]张子豪,王金鼎,张毅辉,等.热处理对CuCrZrSi合金性能和时效动力学的影响[J].稀有金属,2026,50(01):17-24.DOI:10.13373/j.cnki.cjrm.XY23100037.
基金信息:
中央高校基本科研业务费（N2302014）资助
2026-01-15
2026-01-15