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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

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Advanced In-Line Nanocrystallization of Amorphous Metal Ribbon (AMR) Alloys Through Mechanical and Electromagnetic Fields
An Irreversible Thermodynamic Perspective on Chemical Reaction Kinetics in Ceramic Processing under Resonant Microwave-fields
Characterization of the Native Thin Oxide Layer of Copper Metal Powder Sintered via Microwaves
Effect of Alternating Electromagnetic Field on Extracellular Polymeric Substances Derived from Biofilms And Its Mechanism
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
Exploration of Phase Transformations in alnico and its Implications for Magnetic Annealing
In-situ High Spatial Resolution Two-color Thermography in Micrwoave Selective Heating System
Locally Activated Solution Processing Would be Preferable Than General Hydrothermal/Solvothermal Processing Using Autoclaves
Magnetic Field-assisted Electrodeposition of Nickel Composite Coatings
Magnetic Field-Assisted Freeze Casting of Porous Ceramic Structures
Microwave Effects in Heterogenous Materials: A Study on Catalysis
Modeling Microstructural Evolution under Applied Magnetic Fields
P2-70: Characterization of Graphite-Si-SiC Ceamics Processed by Microwave Assisted Reactive Melt Infiltration
Proposal of Mining Method of Methane Hydrate by Microwave
Radio Frequency and Microwave Heating of Preceramic Polymers and its Application in Silicon Carbide Processing
Stage I Laser Flash Sintering
Surface-charge Mobility Theory: An Explanation for Certain "Microwave Effects"
Thermal Analysis of a High Temperature Coaxial Dielectric Test Cell
Ultrasonic and Vibration Enhanced Materials Processing
Vapor Dephosphorization Kinetics from Steel Making Slag by Microwave Rapid Heating

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