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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


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An Irreversible Thermodynamic Perspective on Chemical Reaction Kinetics in Ceramic Processing under Resonant Microwave-fields
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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
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Ultrasonic and Vibration Enhanced Materials Processing
Vapor Dephosphorization Kinetics from Steel Making Slag by Microwave Rapid Heating

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