|About this Abstract
||Materials Science & Technology 2019
||Processing and Performance of Materials Using Microwaves, Electric and Magnetic Fields, Ultrasound, Lasers, and Mechanical Work – Rustum Roy Symposium
||Electro-pulse and High Magnetic Field Annealing of Cold-Rolled NiFe
||Ian Baker, Patrice Chantrenne, Si Chen, Damien Fabrègue, Xiaobin Guo, Nour Hayek, Gerard Ludtka, Bart Murphy, Rachel Osmundsen, Yang Ren, Ty Teodori, Liang Wang, Chao Yang
|On-Site Speaker (Planned)
L1o-structured NiFe has a theoretical magnetic energy product, (BH)max, comparable to that of rare-earth magnets but costs much less. The L1o structure only occurs below about 330C and so, unfortunately, the transformation from the equilibrium high temperature f.c.c. phase takes a very long time. In this work, two novel approaches were used in an attempt to produce L1o-structured NiFe from the high temperature f.c.c. phase. The idea common to both is to heavily roll NiFe and then recrystallize it below 330C with the hypothesis that recrystallizing grain boundaries sweeping through the material will enable the low-temperature form to be produced by local atom switching. Two approaches that accelerate recrystallization were used electro-pulse annealing, and annealing in a high magnetic field. The crystal structures and microstructures obtained after using these two processing routes have been analyzed using EBSP imagining in a SEM and by synchrotron X-ray diffraction.
||Planned: At-meeting proceedings