DocumentCode :
1759871
Title :
Transformation Heat Treatment of Rapidly Quenched 
Precursor Monitored In Situ by High Energy Synchrotron Diffraction
Author :
Scheuerlein, C. ; Ballarino, A. ; Di Michiel, M. ; Jin, Xinzhe ; Takeuchi, T. ; Kikuchi, A. ; Tsuchiya, K. ; Nakagawa, Koichi ; Nakamoto, Takamichi
Author_Institution :
CERN, Geneva, Switzerland
Volume :
23
Issue :
3
fYear :
2013
fDate :
41426
Firstpage :
6000604
Lastpage :
6000604
Abstract :
Nb3Al superconductors are studied for use in high field magnets. Fine-grained Nb3Al with nearly stoichiometric Al content is obtained by a rapid heating quenching and transformation process. We describe a nondestructive in situ study of the transformation process step of a rapid heating quenching Nb3Al precursor wire with ramp rates of either 120 °C/h or 800 °C/h. High-energy synchrotron X-ray diffraction measurements show the transformation from a Nb(Al)SS supersaturated solid solution into Nb3Al. When heating with a ramp rate of 120 °C/h, a strong reduction of the Nb(Al)SS (110) diffraction peak component is observed when the temperature exceeds 660 °C. Additional diffraction peaks are detectable in the approximate temperature interval 610 °C -750 °C and significant Nb3Al growth is observed above 730 °C.
Keywords :
X-ray diffraction; aluminium alloys; heat treatment; niobium alloys; rapid solidification; solid solutions; stoichiometry; superconducting coils; superconducting magnets; type II superconductors; wires; diffraction peak component; heat treatment; high field magnets; high-energy synchrotron X-ray diffraction measurements; nondestructive in situ; precursor wire; rapid heating quenching process; rapid heating transformation process; stoichiometric content; supersaturated solid solution; temperature 120 degC; temperature 800 degC; Diffraction; Lattices; Niobium; Solids; Temperature measurement; Wires; X-ray diffraction; $hbox{Nb}_{3}hbox{Al}$
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/TASC.2012.2233257
Filename :
6384698
Link To Document :
