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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium Fundamental Aspects and Modeling Powder Metal Synthesis and Processing
Presentation Title Enhanced Texture and Magnetic Energy Product in Alnico Magnets Utilizing Solid State Processing
Author(s) Aaron Kassen, Emma White, Wei Tang, Lin Zhou, Matthew Kramer, Iver Anderson
On-Site Speaker (Planned) Aaron Kassen
Abstract Scope 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.
Proceedings Inclusion? Undecided

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Numerical Tool to Master the SPS Densification of TiAl Complex Shapes
A Study of the Brazing Filler Pastes by Gas Atomized Cu-Fe Powders for Cu/STS Joints
Algorithmic Prediction of Bulk Properties from Powdered Feedstock Consolidated via Laser-assisted Cold Spray
Anisotropy of Mass Transfer during Sintering of Powder Materials with Pore-Grain Structure Orientation
Characterizing the Effect of Powder Properties on In-Machine Performance in Powder Bed Direct Metal Additive Manufacturing
Development of Novel Multi-compaction Technique for Fabrication of Hybrid P/M Steels
Dislocation Density Approach to Understanding Sintering Mechanics
Effect of Additives on the Densification Kinetics and Microstructure of Hot-Pressed Boron Suboxide
Engineering the Microstructure and Mechanical Properties of Titanium Alloys via Hydrogen Sintering and Phase Transformation (HSPT)
Enhanced Texture and Magnetic Energy Product in Alnico Magnets Utilizing Solid State Processing
Fabrication of Ti Powder by Combined Techniques of Cold Crucible and Gas Atomization
Formation of Nano-lamellar Structure in Ni-Al High-density Energetic Material by Cryomilling
Fundamental Parameters for Control of Two-Fluid Close-Coupled Gas Atomization: Process Observations and Modeling with Correlations to Metal Powder Yields
Grain Growth and Densification of Tungsten Nanopowders
Influence of Loading Modes in Spark Plasma Sintering
Influence of the Plasma Gas Composition and Power Level on the Processing of Powders by Induction Plasma
Mechanisms of Pore Formation in High-temperature Carbides: Case Study of TaC Prepared by Spark Plasma Sintering
Mesoscale Modeling of Single Particle Impact Induced Microstructural Evolution during Cold Spray of Aluminum Powders
Microstructural Development in Binary Aluminum-Copper Alloy Powders during Gas Atomization
Microstructural Evolution during Early Stages of Hot Isostatic Pressing of 316L Austenitic Stainless Steel
Microstructural Evolution in Dilute Mg-X Binary Alloys Processed by Mechanical Alloying
Microwave vs Conventional Sintering of Ti Powders: Comparative Analysis
Modeling and Optimization of Hierarchical Porous Structures during Spark Plasma Sintering
On the Role of Electric Current in Spark Plasma Sintering of Conductive Powders
Optimization of Temperature Regime of Spark Plasma Sintering of AlON Powder
Particle Charging during Electron-beam Additive Manufacturing
Predicting (1) Activated Sintering of Refractory Metals and (2) Flash Sintering of Oxides
Self-propagating High-temperature Synthesis for Synthesizing Tantalum Carbide from Ta Metal Scraps
Sintering of Titanium-Magnesium Alloys with Stable Nanocrystalline Structure
Size-Scaled High-Performance Alnico Magnets with Enhanced Mechanical Properties and Near-Final Shape
Thermodynamics versus Kinetics of Grain Growth Control to Enable Stable Nanocrystalline Materials
Titanium-Based Alloys with Gradient Structures Fabricated by Blended Elemental Powder Metallurgy (BEPM)
Titanium Hydrides Enhancing Improvement of Ductility of PM α-Ti Material

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