LAUSR

Abstract A series of Nb 3 Al bulks were prepared to study the effects of sintering pressure on superconducting properties of mechanically alloyed (MA) Nb 3 Al. 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 Nb 3 Al. Comparing to the Nb 3 Al with atmosphere pressure (AP) sintering, the T c, onset and J c at 8 K, 7 T for HP Nb 3 Al with a milling time of 2 h increase up to 15.7 K and 6.03 × 10 4  A/cm 2 from 15.1 K and 0.56 × 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 Nb 3 Al superconductor.