| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
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| Symposium
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Metal Powder Synthesis and Processing: Fundamental Aspects and Modeling
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| Presentation Title |
Microstructure Alignment Effects from Engineered Cooling during
Additive Manufacturing of Alnico Magnets from Pre-alloyed Powder
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| 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 550°C) 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. |