Title :
Structure and properties of differently directed deformed niobium-titanium alloy
Author :
Chernyi, Oleg V. ; Storozhilov, Gennadiy E. ; Andrievskaya, Natalia F. ; Ilichova, Vera O. ; Starodubov, Yakov D. ; Volchok, Oleg I. ; Chirkina, Lidia A. ; Lazareva, Marina B. ; Okovit, Vladimir S.
Author_Institution :
Kharkov Inst. of Phys. & Technol., Ukraine
fDate :
6/1/2005 12:00:00 AM
Abstract :
Cylindrical blanks of Nb-48.5 wt.%Ti alloy were prepared with a variable degree of plastic strain at different temperatures of the treatment by using the thermomechanical treatment consisting of deformation of the ingot via upsetting in a closed container and its subsequent extrusion from this container to the initial size. The true strain value over one cycle of such a treatment is approximately 1.6, with the number of cycles varying from 1 to 5. Measurements were taken of strength, plastic and elastic characteristics of the differently directed deformed alloy over different stages of superconductor fabrication. TEM was used to study the microstructure of the alloy in the course of plastic deformation. It is established that such combined treatment promotes formation of a better homogeneous dispersed structure. With that the current characteristics of the niobium-titanium superconductor increase. The highest critical current density after such a treatment was 4.1 k/mm2 under the applied magnetic field 5 T at 4.2 K.
Keywords :
composite superconductors; critical current density (superconductivity); elasticity; extrusion; niobium alloys; plastic deformation; tensile strength; thermomechanical treatment; titanium alloys; transmission electron microscopy; 4.2 K; 5 T; Nb-Ti; NbTi superconductor; critical current density; cryogenic treatment; elastic characteristics; extrusion; ingot deformation; mechanical property; microstructure; niobium-titanium alloy; plastic deformation; plastic strain; superconductor fabrication; thermomechanical treatment; upset forging; Capacitive sensors; Containers; Fabrication; Niobium alloys; Niobium compounds; Plastics; Superconducting materials; Temperature; Thermomechanical processes; Titanium compounds; Critical current density; NbTi superconductor; cryogenic treatment; extrusion; mechanical properties; microstructure; upset forging;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2005.849017
