|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Fundamental Aspects and Modeling Powder Metal Synthesis and Processing
||Enhanced Texture and Magnetic Energy Product in Alnico Magnets Utilizing Solid State Processing
||Aaron Kassen, Emma White, Wei Tang, Lin Zhou, Matthew Kramer, Iver Anderson
|On-Site Speaker (Planned)
Commercial production of aligned anisotropic alnico requires costly processing like directionally solidified casting which often is inefficient and results in significant amounts of waste material from machining to final shape. In contrast, current sintered alnico, produced from elemental powder blends or granulated alnico, often has inferior magnetic properties to cast counterparts due to isotropic fine grained microstructures and retained porosity. In response, a new technique is being developed for pre-alloyed powder-processed bulk magnet production using compression molding and sintering to near-final shapes. This technique utilizes an abnormal grain growth mechanism with an applied stress bias to create uniform large grain textures. These bulk magnets were characterized to verify density and analyze microstructure using FE-SEM, OIM/EBSD. The influence of microstructure and grain texture on bulk magnetic properties is discussed with hysteresisgraph measurements, as a function of heat treatment variations. Work funded by USDOE-EERE-VT-EDT program through Ames Lab contract no. DE-AC02-07CH11358.