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Meeting 2023 TMS Annual Meeting & Exhibition
Symposium 2023 Technical Division Student Poster Contest
Presentation Title SPG-57: Sintering and Densification Mechanism of HfB2 Based Ultra High Temperature Ceramics for Hypersonic Space Vehicles
Author(s) Shruti Dubey, Kantesh Balani
On-Site Speaker (Planned) Shruti Dubey
Abstract Scope HfB2-based ultra-high temperature ceramics (UHTCs) are used as protective tiles for nose cones and leading edges of the re-entry vehicles. The present work assesses the effect of temperature on densification and sintering kinetics of HfB2-based ceramics consolidated via spark plasma sintering. Pure HfB2 was sintered at temperatures ranging from 1750–1950C under a constant uniaxial pressure of 50 MPa. Maximum densification of ~98% was achieved at > 1850C. Moreover, the sintering kinetics have been studied utilizing a densification data and employing a model based on the creep deformation of materials. The stress exponent (n) < 2 corresponds to temperatures between 1750–1850C, demonstrating that diffusion is the major densification mechanism. However, n was > 2 above 1850C, indicating a transition from diffusion-based to dislocation-based densification mechanisms. This study establishes a solid foundation for a comprehensive understanding of the sintering mechanism and the rationale behind densification in HfB2 based UHTCs.
Proceedings Inclusion? Undecided
Keywords Ceramics, High-Temperature Materials, Mechanical Properties

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

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SPG-12: Synthesis and Characterization of Fullerene-Antibody Conjugate Energetic Nanoparticles (FACE-NP) for Bladder Cancer Treatment
SPG-15: Transition Mechanism for the Metastable Phases in Al-Zn-Mg Alloys: A Novel Molecular Dynamics Approach
SPG-16: A Computer Vision Method of Grain Segmentation for Additive-manufactured Haynes 282 Alloys Under Various Heat Treatments
SPG-17: Characterization of Failure Mechanisms for Multimaterial Interfaces Manufactured with Additive Friction Stir Deposition
SPG-18: Characterization of Microstructural Heterogeneities in Electron Beam Additively Manufactured Haynes 282
SPG-19: Comparison of Experimental and Analytical Melt Pool Geometries for High Thermal Conductivity Refractory Metals Using ANSYS
SPG-1: Determination of Mechanical, Thermal and Barocaloric Properties of Elastomers by Rheological Techniques for Hydrostatic Pressure based Solid State Refrigeration
SPG-20: Correlating Laser Process Conditions to Balling Severity with Time-Resolved Synchrotron X-ray Visualization
SPG-21: Development of a Generalized Fatigue Assessment Approach for Steel Castings
SPG-22: Effect of Chemical Pretreatment on Properties of Natural Fiber Reinforced Composites for 3D Printing
SPG-23: Effect of Laser Surface Remelting on the Microstructure, Mechanical, Tribological and Corrosion Properties of Bio-applicable Ti40Nb25Zr25Ta10 Medium Entropy Alloy (MEA) with 0.5 at. % O
SPG-24: Effect of Process Parameters on Texture and Anisotropy of Ti-6Al-4V Wall Components Made by Wire-feed DED Process
SPG-25: Effects of the Reduction Temperature and Amount of Diluent on the Properties of High-purity Tantalum Powder Prepared via the Hunter Process
SPG-26: Effects of Varying Heat Accumulation in Laser Powder Bed Fusion on Microstructure Outcomes in Ti-6Al-4V
SPG-27: Evaluating the Effect of Tool Offset on Repaired AA7050 by Additive Friction Stir Deposition
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SPG-29: In Operando Synchrotron X-ray Tomography Study of Fine Eutectic Polyphase Solidification Patterns
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SPG-30: Induction-Coupled Thermomagnetic Processing of Fe-C Alloys
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SPG-32: Melt-pool Dynamics during Multiple-laser-beamed Powder Bed Fusion of Stainless Steel
SPG-33: Modeling for Time Dependent Grain Boundary Evolution
SPG-34: Multi-scale In Situ Studies of Deformation Mechanism of L-PBF 316L Stainless Steels
SPG-36: On the Influence of Gaussian and Ring-shaped Beam Profiles on Quality and Energy Consumption in L-PBF of Inconel 718
SPG-37: Oxide Morphology and Growth Kinetics for Additively Manufactured 316L Austenitic Stainless Steel High Temperature Steam Exposures
SPG-38: Printability and Defects in W & W -alloys by Directed Energy Deposition
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SPG-3: Flexural Properties of Low Density Polyethylene Hybrid Nanocomposite Reinforced with Linen and Aramid Fabric
SPG-40: Removal of Rare Metal Impurities by Electron-beam Melting Refining Process
SPG-41: Strain Evolution and Damage Development during Tight-radius Bending of Advanced High Strength Steels
SPG-44: Advanced Characterization of the Local Atomic Orders and Their Effects on the Mechanical Properties in Metallic Glasses
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SPG-55: Modeling of Non-equilibrium Phenomena in Laser Additive Manufacturing Using Molecular Dynamics
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SPG-57: Sintering and Densification Mechanism of HfB2 Based Ultra High Temperature Ceramics for Hypersonic Space Vehicles
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SPU-3: Correlating Local and Global Tensile Deformation Behavior of AlSi10Mg Specimens Fabricated Via Laser Powder Bed Fusion
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