A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Phase Formation and Critical Currents in PM Nb3Al Multifilamentary Wires
Abstract It has been demonstrated that multicore Nb3Al wires with stabilizing copper matrix can be prepared by powder metallurgy. High critical current densities of jc = 1.2·105 A/cm2 at 10 T were achieved for single core wires with a high areal reduction ratio (ARR) of q = 9·105. For high ARR the A15 phase is formed at relatively low temperatures of about 650°C, bypassing the a phase. Phase formation has been studied by DSC, Tc measurements and XRD. The DSC results are quantitatively described by a layer model. Prior to the A15 phase NbAl3 and bcc NbAl are formed. The amount and formation temperature of these preliminary stages depends on the ARR, indicating that the absolute layer thickness of Nb and Al influences the phase formation. Phase formation in Nb-Al multilayers of submicron scale does not follow the reaction sequence according to the equilibrium phase diagram.
Phase Formation and Critical Currents in PM Nb3Al Multifilamentary Wires
Abstract It has been demonstrated that multicore Nb3Al wires with stabilizing copper matrix can be prepared by powder metallurgy. High critical current densities of jc = 1.2·105 A/cm2 at 10 T were achieved for single core wires with a high areal reduction ratio (ARR) of q = 9·105. For high ARR the A15 phase is formed at relatively low temperatures of about 650°C, bypassing the a phase. Phase formation has been studied by DSC, Tc measurements and XRD. The DSC results are quantitatively described by a layer model. Prior to the A15 phase NbAl3 and bcc NbAl are formed. The amount and formation temperature of these preliminary stages depends on the ARR, indicating that the absolute layer thickness of Nb and Al influences the phase formation. Phase formation in Nb-Al multilayers of submicron scale does not follow the reaction sequence according to the equilibrium phase diagram.
Phase Formation and Critical Currents in PM Nb3Al Multifilamentary Wires
Heine, Klaus (author) / Flükiger, René (author)
1990-01-01
8 pages
Article/Chapter (Book)
Electronic Resource
English
Microstructural observation of Nb~3Al multifilamentary superconducting wires
| British Library Online Contents | 1993
Effects of Transverse Stress on the Current Carrying Capacity of Multifilamentary Wires
| Springer Verlag | 1990
| British Library Online Contents | 2007
High frequency currents on wires
| Engineering Index Backfile | 1919
Efficient Diffusion Bonding between BSCCO Superconducting Multifilamentary Tapes
| British Library Online Contents | 2008