Title :
Kinetics of phase growth in the Cu-Sn system and application to composite Nb3Sn strands
Author :
Mattafirri, Sara ; Barzi, Emanuela ; Fineschi, Fabio ; Rey, Jean-Michel
Author_Institution :
Fermi Nat. Accel. Lab., USA
fDate :
6/1/2003 12:00:00 AM
Abstract :
Nb3Sn is the superconductor most used in the R&D of high field accelerator magnets by either the wind&react or the react&wind technique. In order to program the low temperature steps of the heat treatment, the growth kinetics of Cu-Sn intermetallics was investigated as a function of duration and temperature. The diffusion constants of η, ε and δ phases between 150 °C and 550 °C were evaluated using Cu-Sn model samples. For an accurate data analysis, statistical and systematic errors were determined. Next the behavior of Internal Tin and Modified Jelly Roll Nb3Sn composites was compared with the model predictions.
Keywords :
copper alloys; heat treatment; niobium alloys; phase separation; self-diffusion; tin alloys; type II superconductors; 150 to 550 degC; Cu-Sn; Cu-Sn intermetallics; Internal Tin; Nb3Sn; composite Nb3Sn strands; diffusion constants; heat treatment; high field accelerator magnets; low temperature steps; modified jelly roll Nb3Sn composites; phase growth kinetics; statistical errors; systematic errors; Accelerator magnets; Heat treatment; Intermetallic; Kinetic theory; Niobium; Research and development; Superconducting magnets; Temperature; Time of arrival estimation; Tin;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2003.812339
