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Cu-10Cr-0.4Zr alloy and in-situ composites based on the alloy were prepared. Microstructural evolution and mechanical properties of the Cu-10Cr-0.4Zr filamentary insitu composites were investigated. It was found that with the increasing of drawing strains from 2.1 to 6.2, the thickness of Cr filaments decreased from about 5 100 nm to 300 nm, and the ultimate tensile strength increased from 510 MPa to 1089 MPa. With increasing drawing strain up to 4.2, the Cr filaments were constrained to fold or twist (even overlapped together) on cross-sections, this could be attributed to deformation compatibility between the Cu matrix and Cr filaments, as well as the deformation mechanisms of bcc-Cr. Meanwhile, with the increasing of drawing strains from 2.1 to 6.2, the ultimate tensile strength values calculated by a modified strengthening model were in good agreement with the experimental values.

Microstructural evolution and mechanical properties of Cu-10Cr-0.4Zr filamentary in-situ composites