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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium Fundamental Aspects and Modeling Powder Metal Synthesis and Processing
Presentation Title Dislocation Density Approach to Understanding Sintering Mechanics
Author(s) Chaoyi Zhu, Diletta Giuntini, Tyler Harrington, Eugene Olevsky, Kenneth Vecchio
On-Site Speaker (Planned) Chaoyi Zhu
Abstract Scope Understanding of how dislocations accumulate in the sintered particles is fundamental to shrinkage kinetics. Based on bulk and pipe diffusivity data from the literature, Olevsky <I>et al.</I>’s theoretical model relates dislocation density to shrinkage rates. Experimentally, nanoindentation allows determination of the total dislocation density, comparable with theoretical predication, including statistically stored dislocation (SSD) and geometrically necessary dislocations (GND). Utilizing Nye’s tensor, we are able to separate out the geometrically necessary part of the total dislocation density present to accommodate lattice curvature using EBSD based computational methods. In this study, GND density data validates the nanoindentation result and reconfirm that the theoretical predication of dislocation density is higher in the compaction plane than the compaction direction of powder compacts. In addition, detailed information about GND dislocation structure can be mapped to the sintered particles, which sheds light on the micromechanics of the sintering process.
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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