Fabrication of Nb3Al superconducting wires by utilizing the mechanically alloyed Nb(Al)ss supersaturated solid-solution with low-temperature annealing

Fabrication and Superconducting Properties of Rod‐In‐Tube Multifilamentary Nb3Al Wire With Rapid Heating and Quenching Heat‐Treatment

“…5(a). It can be seen that all the samples have the onset T c of 16.8 K-17.3 K, which are significantly higher than those of the low-diffusion and mechanically alloyed Nb 3 Al superconductors [4], [9], but similar to the RHQT Nb 3 Al superconducting wires, prepared by Banno et al [10].…”

Phase formation and superconducting properties of mechanically alloyed Nb3(Al1−xGex) system

“…According to previous reports [21][22][23], for each run, mixture powders of approximately 2.0 g and stainless steel balls of 20 g (ball-to-powder weight ratio = 10:1) were loaded into a stainless steel vial in an argon-filled glove box and milled for 3 h. Then, the mechanically alloyed powders were pressed into pellets and sealed into a vacuum quartz tube. Finally, the samples were put into a tubular furnace for sintering at 1100 °C for 5 h with flowing Ar atmosphere.…”

“…In order to study the influence of sintering temperature (T s ) on the crystal structure and microstructure as well as the superconducting properties of the samples, several values of T s between 850 °C and 1300 °C were chosen for optimizing the sintering conditions for Nb 3 (Al 1−x Ge x ). The milling and sintering time remained at 3 h and 5 h, respectively, according to our previously obtained optimal conditions [21][22][23]. During the sintering process the samples were sealed in the evacuated quartz tubes when T s 1200 °C.…”

“…Material was usually formed by the continuous fragmentation and re-welding mechanism of grains in the process of the ball milling. Thus high-energy ball milling has been widely used for preparing Nb-Al alloy [14][15][16][17][18][19][20][21][22][23].…”

Manufacture, electromagnetic properties and microstructure of an 18-filament jelly-roll Nb3Al superconducting wire with rapid heating and quenching heat-treatment

“…In order to develop practical kilometer Nb 3 Al superconducting wires, many efforts have been made during the past three decades [8][9][10][11][12]. Among these works, the jelly-roll method to make Nb 3 Al precursor long wires that combines rapid heating and quenching (RHQ) heat-treatment is proved to be the most successful route to prepare the high-performance Nb 3 Al superconducting long wires, which could achieve a J c exceeding 1000 A mm −2 at 4.2 K and 15 T, a T c of 18.0 K and H c2 of 29.5 T at 4.2 K [2,12].…”