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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 Exploration of Phase Transformations in alnico and its Implications for Magnetic Annealing
Author(s) Emily Anne Rinko, Iver Anderson, Tim Prost, Pratik Ray, Emma White, Wei Tang, Lin Zhou, Matthew Kramer
On-Site Speaker (Planned) Emily Anne Rinko
Abstract Scope Alnico is a rare earth-free permanent magnet (PM) contender for future interior PM motors for propulsion of electric/hybrid vehicles. Alnico’s PM properties arise from an aligned microstructure that spinodally decomposes to Fe-Co and Al-Ni phases during magnetic annealing (MA) and further partitions during post-MA annealing. Volume percentage, morphology, and isolation of aligned nano-metric Fe-Co rods are key to optimal magnetic properties for alnico. Initial high temperature X-ray diffraction studies (HT-XRD) found dual reaction onset temperatures, i.e., spinodal decomposition behavior that contradicts literature, suggesting that alnico MA practices are not optimized. Utilizing a higher temperature furnace (permitting an unambiguous solid solution prior to spinodal decomposition) with scanning and isothermal studies, ultra-bright, high-energy x-ray diffraction was able to explore related phase transformations in alnico powders with improved resolution. The potential optimization of alnico PMs will be discussed. Work supported by USDOE-OTT-TCF program with funds from EERE-VTO through Ames Lab contract no. DE-AC02-07CH11358.
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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