Some effects of porosity and HIP'ing on critical currents in internal-tin-processed multifilamentary Nb3Sn wires

摘要

The extent and nature of the porosity developed in both tin-core and tin-ring internal tin Nb(sub 3)Sn materials has been tentatively explored. The porosity was reduced by HIP'ing either after the final heat treatment or at an intermediate state. The J(sub c) in the HIP'd materials appears to be improved at fields below 15 T, but above this field the HIP'd 19 subelement material shows lower J(sub c)'s at zero applied strain.