Significantly enhancement of critical current density properties of mechanically alloyed Nb3Al superconductor by hot-pressure sintering route

摘要

A series of Nb3Al bulks were prepared to study the effects of sintering pressure on superconducting properties of mechanically alloyed (MA) Nb3Al. The results suggest that hot-pressure (HP) sintering can significantly improve the critical current density (J(c)) and superconducting transition temperature (T-c) of MA Nb3Al. Comparing to the Nb3Al with atmosphere pressure (AP) sintering, the T-c, onset and J(c) at 8 K, 7 T for HP Nb3Al with a milling time of 2 h increase up to 15.7 K and 6.03 x 10(4) A/cm(2) from 15.1 K and 0.56 x 10(4) A/cm(2), respectively. Improvements in reducing porosity and grain connectivity are thought to be mainly responsible to the J(c)-enhancement of HP Nb3Al superconductor. (C) 2017 Elsevier B.V. All rights reserved.