Microstructures of rapidly-heated/quenched and transformed Nb3Al multifilamentary superconducting wires

被引：41

作者：

Kikuchi, A ^{[1
]}

Iijima, Y ^{[1
]}

Inoue, K ^{[1
]}

机构：

[1] NRIM, Tsukuba, Ibaraki 3050047, Japan

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 2001年 / 11卷 / 01期

关键词：

Nb3Al multifilamentary wire; rapidly-heating/quenching process; stacking faults; TEM microstructure;

D O I：

10.1109/77.919847

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Microstructures of rapidly-heated/quenched and transformed Nb3Al multifilamentary wires were studied by using transmission electron microscopy, Nb/Al composite wires are fabricated by a jelly-roll process. The Nb/Al composite filaments changed into Nb-Pl supersaturated bcc solid solution with the rapidly-heating/quenching. The Nb-Al bcc phases consists of many crystal grains with diameters of 2-4 mum, surrounded with large-angle grain boundaries, Some spherical voids, about 0.1 micron in diameter, were also observed at the intra- and intergrains. All grain boundaries of the Nb-Al bcc phases are simple flat planes. Then, the Nb-Al bcc phases were transformed into A15 phases (grain size: 0.5-2.0 mum in diameter) with additional annealing, Secondary phases were not observed in the A15 filaments. Grain boundaries of the A15 phases show zig-zag shape unlike those of the Nb-Al bcc phases, and every grain of A15 phases is an aggregation of sub-grains of 80-150 nm in diameter. Sub-grain boundaries are small-angle ones. Moreover, we found that many stacking faults formed in the A15 sub-grains in parallel with spaces of 10-20 nm, These numerous plane defects seem to be the main pinning centers in the rapidly-heated/quenched and transformed Nb3Al wires.

引用

页码：3615 / 3618

页数：4

共 5 条

[1] UPPER CRITICAL FIELDS OF HIGH-TEMPERATURE SUPERCONDUCTING NB1-Y(A11-XGEX)Y AND NB3A1 - MEASUREMENTS OF HC2 GREATER THAN 400 KG AT 4.2 DEGREES K [J].