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Meeting Materials Science & Technology 2019
Symposium Processing and Performance of Materials Using Microwaves, Electric and Magnetic Fields, Ultrasound, Lasers, and Mechanical Work – Rustum Roy Symposium
Presentation Title Electro-pulse and High Magnetic Field Annealing of Cold-Rolled NiFe
Author(s) 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) Ian Baker
Abstract Scope 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 330C 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 330C 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.
Proceedings Inclusion? Planned: At-meeting proceedings


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Effect of Pulsed Electric Current on Metastable Austenitic Steel
Effective Permittivity of Metal/Ceramic Composites and Microwave Heating Characteristics
Electric Current Annealing of Zircaloy Alloy and Associated Mechanisms
Electro-pulse and High Magnetic Field Annealing of Cold-Rolled NiFe
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Microwave Effects in Heterogenous Materials: A Study on Catalysis
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Surface-charge Mobility Theory: An Explanation for Certain "Microwave Effects"
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Ultrasonic and Vibration Enhanced Materials Processing
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