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Abstract: Cu-Ag filamentary microcomposites with different Ag contents were prepared by cold drawing and intermediate heat treatments. The microstructure characterization and filamentary distribution were observed for two-phase alloys under different conditions. The effect of heavy drawing strain on the microstructure evolution of cu-Ag alloys was investigated. The results show that the microstructure components consist of Cu dendrites, eutectic colonies and secondary Ag precipitates in the alloys containing 6%~24% (mass fraction) Ag. With the increase in Ag content, the eutectic colonies in the microstructure increase and gradually change into a continuous net-like distribution. The Cu dendrites, eutectic colonies and secondary Ag precipitates are elongated in an axial direction and developed into the composite filamentary structure during cold drawing deformation. The eutectic colonies tend to evolve into filamentary bundles. The filamentary diameters decrease with the increase in drawing strain degree for the two-phase alloys, in particular for the alloys with low Ag content. The reduction in filamentary diameters becomes slow once the drawing strain has exceeded a certain level.

[1] Benghalem, A., Morris, D.G., 1997. Microstructure and strength of wire-drawn Cu-Ag filamentary composites. Acta Materialia, 45(1):397-406.

[2] Gaganov, A., Freudenberger, J., Grünberger, W., Schultz, L., 2004. Microstructural evolution and its effect on the mechanical properties of Cu-Ag microcomposites. Zeitschrift für Metallkunde, 95:425-432.

[3] Gaganov, A., Freudenberger, J., Botcharova, E., Schultz, L., 2006. Effect of Zr additions on the microstructure, and the mechanical and electrical properties of Cu-7 wt.%Ag alloys. Materials Science and Engineering A, 437(2):313-322.

[4] Grünberger, W., Heilmaier, M., Schultz, L., 2001. Development of high-strength and high-conductivity conductor materials for pulsed high-field magnets at Dresden. Physica B: Condensed Matter, 294-295(4):643-647.

[5] Grünberger, W., Heilmaier, M., Schultz, L., 2002. Microstructure and mechanical properties of Cu-Ag microcomposites for conductor wires in pulsed high-field magnets. Zeitschrift für Metallkunde, 93:58-65.

[6] He, J., Ji, V., Meng, L., 2008. Effects of strain and annealing on the intensity and distribution of crystal texture in Cu-12 wt.% Ag. Materials Science and Engineering A, 478(1-2):305-313.

[7] Herlach, F., 2001. Innovations and trends in magnet laboratories and techniques. Physica B, 294-295(4):500-504.

[8] Hong, S.I., Kim, P.H., Choi, Y.C., 2004. High strain rate superplasticity of deformation processed Cu-Ag filamentary composites. Scripta Materialia, 51(2):95-99.

[9] Lee, K.H., Hong, S.I., 2003. Interfacial and twin boundary structures of nanostructured Cu-Ag filamentary composites. Journal of Materials Research, 18(9):2194-2201.

[10] Li, Z.D., Meng, L., 2005. Effects of rare earth additions on microstructure and properties of Cu-12% Ag filamentary composites. Journal of Zhejiang University (Engineering Science), 39:1837-1841 (in Chinese).

[11] Lin, J., Meng, L., 2008. Effects of aging treatments on microstructure and mechanical properties of Cu-Ag alloys. Journal of Alloys and Compounds, 454(1-2):150-155.

[12] Liu, J.B., Meng, L., 2006. The characteristics of Cu-12 wt.% Ag filamentary microcomposite in different isothermal process. Materials Science and Engineering A, 418(1-2):320-325.

[13] Liu, J.B., Meng, L., 2008. Phase orientation, interface structure and properties of aged Cu-6 wt.% Ag. Journal of Materials Science, 43(6):2006-2011.

[14] Liu, J.B., Meng, L., Zeng, Y.W., 2006. Microstructure evolution and properties of Cu-Ag microcomposites with different Ag content. Materials Science and Engineering A, 435-436:237-244.

[15] Liu, J.B., Zhang, L., Meng, L., 2007. Relationships between mechanical strength and electrical conductivity for Cu-Ag filamentary microcomposites. Applied Physics A, 86(4):529-532.

[16] Ohsaki, S., Yamazaki, K., Hono, K., 2003. Alloying of immiscible phases in wire-drawn Cu-Ag filamentary composites. Scripta Materialia, 48(12):1569-1574.

[17] Rosseel, K., Herlach, F., Boon, W., Bruynseraede, Y., 2001. Multi-composite wires for pulsed field coils. Physica B: Condensed Matter, 294-295(4):679-683.

[18] Sakai, Y., Inoue, K., Asano, T., Wada, H., Waeda, H., 1991. Development of high-strength, high-conductivity Cu-Ag alloys for high-field pulsed magnet use. Applied Physics Letter, 59(23):2965-2967.

[19] Song, J.S., Hong, S.I., Park, Y.G., 2005. Deformation processing and strength/conductivity properties of Cu-Fe-Ag microcomposites. Journal of Alloys and Compounds, 388(1):69-74.

[20] Zhang, L., Meng, L., 2003. Microstructure and properties of Cu-Ag, Cu-Ag-Cr and Cu-Ag-Cr-RE alloys. Materials Science and Technology, 19(1):75-79.

[21] Zhang, L., Meng, L., 2005. Evolution of microstructure and electrical resistivity of Cu-12 wt.% Ag filamentary microcomposite with drawing deformation. Scripta Materialia, 52(12):1187-1191.

[22] Zhang, L., Meng, L., Liu, J.B., 2005. Effects of Cr addition on the microstructural, mechanical and electrical characteristics of Cu-6 wt.% microcomposite. Scripta Materialia, 52(7):587-592.