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Abstract

A process for producing an ultrafine multifilamentary superconducting Nb.sub.3 (Al,Ge) wire capable of generating a high critical current density comprising: preparing a composite core material comprising an A1--(2-30)at. % Ge alloy (where at. % represents % by atomic) 1 .mu.m or less in thickness uniformly incorporated into a Nb matrix at a volume ratio in a range of 1:2.5 to 1:3.5 and forming a composite therewith; fabricating a composite wire having an ultrafine multifilamentary structure by embedding several tens to several millions of the resulting composite core materials in a cylindrical matrix material containing Nb; forming a A15-phase filament having a lower order in crystallinity inside the composite wire by a rapid heating and quenching treatment comprising rapidly heating to a temperature of 1,700.degree. C. or higher in 2 seconds, followed by continuously introducing it into a molten metal; coating the composite wire with copper (Cu) which functions as a superconductivity stabilizing material; and applying a post heat treatment in the temperature range of from 650 to 900.degree. C. to the resulting product to recover the degree of crystallinity of the Nb.sub.3 (Al,Ge) in the A15 compound.

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