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AssigneeIowa State University Research Foundation, Inc.
InventorsIver E. Anderson, Emma Marie Hamilton White, Matthew J. Kramer, Aaron G. Kassen, Kevin W. Dennis
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Magnet microstructure manipulation in the solid state by controlled application of a sufficient stress in a direction during high temperature annealing in a single-phase region of heat-treatable magnet alloys, e.g., alnico-type magnets is followed by magnetic annealing and draw annealing to improve coercivity and saturation magnetization properties. The solid-state process can be termed highly controlled abnormal grain growth (hereafter AGG) and will make aligned sintered anisotropic magnets that meet or exceed the magnetic properties of cast versions of the same alloy types.
In a method for treating a magnet shape to impart magnetic properties, the step of heating the magnet shape and applying a stress in a direction at a temperature where a single magnet phase exists and for a time that imparts a grain aligned magnetic microstructure.
A sintered alnico magnet having a controlled grain alignment preference in a particular direction.
In a method for treating an alloy shape to impart a single crystal microstructure, the step of heating the alloy shape and applying a stress in a direction at a temperature where a single alloy phase exists and for a time that imparts a grain-aligned, substantially single crystal microstructure.
Dependencies are inferred from the claim text.