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Meeting Materials Science & Technology 2019
Symposium Mechanochemical Synthesis and Reactions in Materials Science IV
Presentation Title Nanocrystalline Maraging Steel Powder Fabricated by Mechanical Milling and their Thermal Stability
Author(s) Ganesh Varma Thotakura, Ramasis Goswami, Tanjore V. Jayaraman
On-Site Speaker (Planned) Tanjore V. Jayaraman
Abstract Scope Nanocrystalline maraging steel powders were fabricated by mechanical milling. The structure of the milled powders was characterized by x-ray diffraction, scanning electron microscopy, and transmission electron microscopy, followed by the characterization of their magnetic properties at sub-ambient (~60 K), ambient, and elevated temperatures (~900 K). The particle size and grain size of the powder particles were less than ~5 μm and ~15 nm, respectively. The pristine alloy powder, at ambient temperature, was primarily comprised of martensite. The intrinsic coercivity (HC) and saturation magnetization (MS) was estimated as ~5 kA/m and ~165 Am2/kg, respectively. While, both HC and MS increased at sub-ambient temperatures, they both decreased at elevated temperatures. Thermal treatment of the powder resulted in an increase in MS and a decrease in HCI. The magnetic properties of the nanocrystalline alloy were compared with their bulk counterparts and with similar nanocrystalline semi-hard as well as soft-magnetic alloys.
Proceedings Inclusion? Planned: Other (journal publication, etc.; describe below)


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