Co-deformation of in-situ Cu-Ag composite produces high-strength-high-conductivity materials. The composites have various applications such as winding high field magnets. The Ag is chosen because it has different lattice parameter from Cu and has almost no solubility in Cu at room temperature so that additions of Ag introduce limited decreasing of the conductivity. Co-deformation provides the composites with a strengh level as high as 1000MPa. This strength level is significantly higher than that predicted by a law-of-mixture and it is about 1/25 of the theoretical strength of Cu (25000MPa). Moreover, the stress-strain curves indicate internal stresses developed in the materials. This paper reports an electron microscopy investigation of the strengthening mechanisms and internal stresses in Cu-25wtpercentAg composites.
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