Abstract
This paper studied the microstructure evolution of a deformation-processed Cu-7Cr in situ composite prepared by thermo-mechanical processing. The longitudinal and transverse sectional microstructures were analyzed using an optical microscope and a scanning electronic microscope. In the longitudinal section, the initially randomly distributed Cr dendrites in the as-cast Cu-7Cr alloy were transformed into the fibres aligned parallel to the drawing axis; the Cr dendrites experienced breaking, flattening and rotating, lapping and merging, and homogenizing and refinement during thermo-mechanical processing. In the transverse section, the initially randomly distributed Cr dendrites in the as-cast Cu-7Cr alloy were changed into the curvy ribbon like fibres; the Cr dendrites underwent breaking, flattening and rotating, folding and twisting, and irregularizing and refinement during thermo-mechanical processing.
Highlights
Over the past several decades, deformation-processed binary Cu-based in situ composites such as Cu-Fe, Cu-Ag, Cu-Nb, and Cu-Cr have been the subject of extensive research due to their high strength and good conductivity [1] [2] [3] [4] [5]
This paper studied the microstructure evolution of a deformation-processed Cu-7Cr in situ composite prepared by thermo-mechanical processing
The initially randomly distributed Cr dendrites in the as-cast Cu-7Cr alloy were transformed into the fibres aligned parallel to the drawing axis; the Cr dendrites experienced breaking, flattening and rotating, lapping and merging, and homogenizing and refinement during thermo-mechanical processing
Summary
Over the past several decades, deformation-processed binary Cu-based in situ composites such as Cu-Fe, Cu-Ag, Cu-Nb, and Cu-Cr have been the subject of extensive research due to their high strength and good conductivity [1] [2] [3] [4] [5]. The Cu-Fe in situ composite has relatively low conductivity due to the relatively high solubility of Fe in the Cu matrix and the . The Cu-Cr in situ composite is of particular interest due to the relatively economical cost and the high strength of Cr, and the limited solubility of Cr in the Cu matrix [7] [8]. The filamentary structure of double phases in the Cu-7Cr in situ composite was produced by severe cold drawing and intermediate heat treatment. The work of Liu et al [13] suggested that the eutectic colonies in Cu-Ag in situ composites were evolved into filamentary bundles with tight arrangement of double phases during severe cold drawing. The evolution of microstructure in Cu-Cr in situ composites still needs further investigation because of the complex co-deformation of Cu and Cr phases.
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