Abstract
The Ti-rich NbTi-multifilament superconductor with a high current density at low fields and low current sharing properties is particularly well suited for application in NMR-magnets. In order to improve the performance of this kind of superconductors a number of Cu-billets with 54 filaments Nb55w/oTi have been extruded in a 1.4 GPa hydrostatic extrusion press. By subsequent cold area reduction and final precipitation heat treatment high critical current densities at low fields are obtained with very low current sharing (J c = 5.8 * 109A/m2at 2T). TEM-investigations reveal a high density of small disc-like ω-Ti precipitates (Ptt. density \simeq 2 * 10^{22} m-3). The ω-Ti precipitates with a special orientation relationship relative to the β-matrix are situated on specific crystallographic planes inside the subbands. This is different from the α-Ti precipitation in subband walls observed by other investigators in conventionally extruded and optimized NbTi-superconductors.
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