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Superconducting Ag or Cu sheathed MgB2 wires have been fabricated byconventional powder-in-tube techniques. The in-situ reaction of Mg and Bpowders with atomic proportions of 1:2 and 1.33:2 inside Ag or Cu tubes at lowtemperatures have been searched. An active alloying of Mg with Ag or Cu sheathsat temperatures below 660 C has been observed. For Ag sheaths, there is astrong diffusion of Mg, which does not allow the formation of large amounts ofMgB2 at the core. For Cu sheaths, the diffusion of Mg is stopped by theformation of a MgCu2 layer around the superconducting core and an appropriatedexcess of Mg leads to superconducting cores with Tc=39 K and good Jc values,thus being possible the development of Cu/MgB2 composite wires.Comment: 10 pages, 5 figures. Submitted to Supercond. Sci. Techno

Study of Ag and Cu/MgB2 powder-in-tube composite wires fabricated by in situ reaction at low temperatures