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The Cu-15.0 at.% Sn microwires with different diameter are prepared by rapid solidification from the melt using the method of glass-coated melt spinning. The amorphous/nanocrystalline structure is observed by transmission electron microscopy (TEM) and the high-resolution transmission-electron-microscopy (HRTEM). The wires with this kind of structure show perfect shape memory and superelastic effect, while it is usually brittle in a bulk polycrystalline form.