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Meeting MS&T23: Materials Science & Technology
Symposium Metal Powder Synthesis and Processing: Fundamental Aspects and Modeling
Presentation Title Microstructure Alignment Effects from Engineered Cooling during Additive Manufacturing of Alnico Magnets from Pre-alloyed Powder
Author(s) Iver E. Anderson, Luke Gaydos, Tyler Rodriguez, Emrah Simsek, Ryan Ott, Emily Rinko, Wei Tang, Matthew Kramer, Nicolas Argibay
On-Site Speaker (Planned) Iver E. Anderson
Abstract Scope Anisotropic alnico rare-earth-free permanent magnets (PMs) have high temperature stability (up to 550C) and saturation magnetization but lack the coercivity and energy product typically needed for challenging applications. Alnico could displace (Dy-free) Nd-Fe-B and reduce cooling needs by better controlling shape anisotropy to increase coercivity and reducing costs from “one-time-use” casting molds for directional solidification of alnico 9 (best PM). Additive manufacturing (AM) of near-net-shapes may address both challenges. Directed-energy deposition (DED) was used with gas-atomized powder and enhanced (directional) substrate cooling to promote beneficially (<001>)-textured microstructures in compositionally modified alnico 8/9 with increased coercivity. As-solidified builds were annealed to equilibrate BCC phase and complete grain growth before quenching. Magnet samples were magnetically annealed for nanostructure alignment during spinodal decomposition. Magnetic properties and microstructures are compared. Funded by KCNSC through Ames Lab contract no. DE-AC02-07CH11358. Honeywell Federal Manufacturing & Technologies, LLC operates the KCNSC for USDOE/NNSA under contract number DE-NA0002839.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Advanced Characterization of Defects in Superalloy Powders Atomized by Various Methods and Effects on Net-shape HIP Product
Effect of Li Concentration on Morphology of Precipitates in Nanocrystalline Cu-3Ta
FEM Analysis of Temperature and Stress Distribution Behavior of Al20Cr20Fe25Ni25Mn10 High Entropy Alloy in Spark Plasma Sintering: Effect of Consolidation Time on Microstructure
Flowability and Suitability of Mechanically Derived Powders for Additive Manufacturing
Microstructural Characterization of Zn-3Mg(wt.%) Processed by High-pressure Torsion
Microstructure Alignment Effects from Engineered Cooling during Additive Manufacturing of Alnico Magnets from Pre-alloyed Powder
Resolving the Sintering Conundrum of Tungsten Alloys
Understanding the Geometry Accuracy and Surface Roughness of Thin Wall Structures for 316L Stainless Steel in Laser Powder Bed Fusion Additive Manufacturing
Vacuum Hot Pressing of Oxide-dispersion Strengthened (ODS) Ferritic Steel Powders Guided by Temperature-scanning High-energy X-ray Powder Diffraction Analysis

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