Open AccessThe Role of CHPD and AIMI processing on enhancing JC and transverse connectivity of in-situ MgB2 strand
Author(s) -
Fei Wan,
M.D. Sumption,
M. Rindfleisch,
E. W. Collings
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/756/1/012018
Subject(s) - in situ , transverse plane , porosity , materials science , crystallography , composite material , chemistry , structural engineering , organic chemistry , engineering
Research into in-situ MgB 2 strand has been focused on improvements in J C through reduction of porosity. Both of cold-high-pressure-densification (CHPD) and advanced-internal-magnesium-infiltration (AIMI) techniques can effectively remove the voids in in-situ MgB 2 strands. This study shows the nature of the reduced porosity for in-situ MgB 2 strands lies on increases in transverse grain connectivity as well as longitudinal connectivity. The CHPD method bi-axially applying 1.0 GPa and 1.5 GPa yielded 4.2 K J CM∥ s of 9.6 × 10 4 A/cm 2 and 8.5 × 10 4 A/cm 2 at 5 T, respectively, with compared with 6.0 × 10 4 A/cm 2 for typical powder-in-tube (PIT) in-situ strand. Moreover, AIMI-processed monofilamentary MgB 2 strand obtained even higher J C s and transverse grain connectivity than the CHPD strands.