INVESTIGATION ON MECHANICAL-PROPERTIES OF NB3SN MULTIFILAMENTARY WIRES

The mechanical properties of multifilamentary Nb3Sn wires have an impo rtant role in their application in large scale magnetic systems. The i nfluence of heat treatment schedules and design factors on the mechani cal properties of rectangular and round section bronze route wires was investigated. Ultimate tensile strength, yield strength and elongatio n of stabilized and nonstabilized wires 0.4 mm x 4 mm in section and 0 .8 - 1.5 mm in dia ;containing 4000 - 14000 Nb filaments before and af ter heat treatment were studied. It was shown that a change of the wir e design, volume fraction of copper, heat treatment regimes influence strongly on strength and plasticity of wires. The level of the mechani cal properties of stabilized wires depends on the volume fraction and location of stabilizer in the section of Nb3Sn wire.