Distinct Electrical and Mechanical Responses of a Cu-10Fe Composite Prepared by Hot-Pressed Sintering and Post Treatment

doi:10.1007/s40195-023-01633-5

Abstract

Abstract:

A Cu-10wt%Fe composite was prepared through hot-pressed sintering, and the material was subsequently solution treated. The hot-pressed sintered and solution treated materials were rolled and aged. The precipitation behavior and performance changes were systematically studied by using scanning electron microscopy and transmission electron microscopy. In contrast to the hot-pressed sintered specimen, the solution treatment significantly affects the thermal stability and properties of the Cu-10wt%Fe composite. The Cu-10wt%Fe composite was prepared after solid solution, cold rolling and aging at 773 K for 1 h, and it obtained excellent tensile strength of 494 MPa, uniform elongation of 16.3%, electrical conductivity of 51.1% IACS and softening temperature of 838 K. Mechanisms for the distinct difference in thermal stability and properties between hot-pressed sintered and solution treated specimens were analyzed. These findings provide a theoretical basis for designing high-performance Cu-based in-situ composites by post treatment.

Key words: Cu-Fe composite, Hot-pressed sintering, Thermal stability, Strength, Electrical conductivity

X. Y. Yue, S. Y. Peng, X. Zhang, C. N. He, Y. Z. Tian. Distinct Electrical and Mechanical Responses of a Cu-10Fe Composite Prepared by Hot-Pressed Sintering and Post Treatment[J]. Acta Metallurgica Sinica (English Letters), 2024, 37(2): 255-265.

Figures/Tables 12

Fig. 1 Cu-10Fe composites prepared by hot-pressed sintering a and post treatment b

Fig. 2 Morphology a and transverse section microstructure b of Cu-10Fe powders

Fig. 3 Plots of hardness a and electrical conductivity b against aging temperature for CR and SCR specimens

Fig. 4 Tensile engineering stress-strain curves of SCR a and CR b specimens after aging at different temperatures

Fig. 5 Plots of ultimate tensile strength a and elongation to failure b against aging temperature for SCR and CR specimens

Fig. 6 SEM images and corresponding EDS maps of Cu-10Fe composites under hot-pressed sintering a-c, solid solution treatment d-f

Fig. 7 STEM image a and the corresponding EDS maps of the CR specimen b, c

Fig. 8 TEM micrographs of the CR specimen: TEM bright field image and band width statistics a-c, HRTEM images d, f, FFT related to (f) e

Fig. 9 TEM micrographs of the SCR specimen: bright field images and statistics of band width a-c, STEM image and EDS maps d-f

Fig. 10 ECC images of the CR a, b specimen after aging at 573 K c, d and 773 K e, f for 1 h

Fig. 11 ECC images of the SCR a, b specimen after aging at 573 K c, d and 773 K e, f for 1 h

Fig. 12 Strength and conductivity of CR and SCR specimens under aging treatments

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