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Meeting Materials Science & Technology 2020
Symposium Metallurgy and Magnetism
Presentation Title Comparative Studies on the Structure and Magnetic Properties of Mechanically Alloyed Fe40Co30Ni30 Medium-entropy Alloy in Argon and Ambient Atmospheres
Author(s) Alex Abraham Paul, Anuj Rathi, Tanjore V. Jayaraman
On-Site Speaker (Planned) Tanjore V. Jayaraman
Abstract Scope We compare the structure and magnetic properties of mechanically alloyed Fe40Co30Ni30 medium-entropy alloy fabricated in argon (MA-Ar) and ambient (MA-Air) atmospheres. Irrespective of the atmosphere, the powders were micron-sized, constituting the nanocrystalline γ phase. The saturation magnetization (MS) of MA-Air was less than the MS of MA-Ar by a modest ~6%. The remanent magnetization (MR) and intrinsic coercivity (HCI) of MA-Air were higher than MA-Ar by ~19% and ~28%, respectively. At below-ambient temperatures, both MA-Ar and MA-Air exhibit similar behavior, i.e., MS, and HCI increased with a decrease in temperature. The thermomagnetic behavior of MA-Ar and MA-Air indicated the phase transformation γ  α (Fe) + γ (Fe deplete) at above-ambient temperatures, between ~725 K and ~800 K. The Range of Value Method utility function analyses assigned MA-Air the highest utility value, among the as-prepared and thermally-treated Fe40Co30Ni30 alloy powders, suitable as a ferromagnetic precursor to fabricate semi-hard magnets.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Comparative Studies on the Structure and Magnetic Properties of Mechanically Alloyed Fe40Co30Ni30 Medium-entropy Alloy in Argon and Ambient Atmospheres
Development of FeCo/MnZn Ferrite Composite by Field Assisted Sintering Technique
Effects of Steel Sensitization on Magnetic Properties Measured through MOKE Magnetometry
Exchange Coupled Ferromagnetism in Nanochessboards Obtained By Eutectoid Decomposition in the Co-Pt and Fe-Pt Systems
Improvement of the Magnetic Characteristics of Materials Due to the Formation of Unidirectional Boundaries of Ferrite during Processing in SHS Conditions
Introductory Comments: Metallurgy and Magnetism
Magnetic Performance of Gas-atomized Maraging Steel Powders
Microstructural Development and Mechanical Property Changes Due to Temper Embrittlement in HY-80 Submarine Steel
Modeling the Magnetostructural Interactions in Austenitic Steels at the Quantum Mechanical Level
Processing of Fe-Co Alloys: Past and Present
Processing of Vitreous Fe-based Wires into Nanostructured Soft Magnetic Material
Rapid Thermal Processing of Amorphous and Nanocrystalline Soft Magnetic Alloys
The Effect of Deformation of Low Alloy Steels Used in Metallurgy on Their Magnetic Characteristics
The Influence of the Microstructure Obtained After Processing in SHS Conditions on the Magnetic Characteristics of Steels

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