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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Phase Transformations and Microstructural Evolution
Presentation Title Iron-rich Microstructures in Post-Detonation Nuclear Debris
Author(s) Timothy Genda, Kim Knight, Zurong Dai, Bethany Goldblum, Peter Hosemann
On-Site Speaker (Planned) Timothy Genda
Abstract Scope The formation of radioactive fallout in nuclear detonations depends on the composition and thermal histories of the fireball, but the extent to which environmental materials impact formation processes is not fully understood. To investigate the impact of high iron content on fallout formation, we have analyzed previously unobserved iron-rich microstructures preserved in rapidly-quenched (seconds to minutes) mm-scale glassy fallout from a historical U.S. nuclear test. Autoradiography reveals correlations between long-lived radioactive species and iron rich (>30 wt%) rims where these microstructures are preserved. BSED and EDX characterization reveals a wide variety of crystalline dendritic features and textural evidence of liquid-liquid immiscibility, including 2-20 µm core/shell ‘amoeboids’ which resemble microstructures observed in microgravity immiscible alloy experiments, but have never been observed in silicate systems. Understanding how these microstructures evolved may provide novel means to constrain fallout formation conditions in an Fe-rich environment, informing improvements to first-principles based nuclear fallout formation models.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

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Atomistic modeling based on the Quasiparticle Approach of the Fcc-bcc Phase Transformations
Barrier-free Nucleation at Grain-boundary Triple Junctions during Solid-state Phase Transformations
Beyond Modified Mean Field: A Case for a Stochastic Grain Growth Model in the Short Time Limit
Comparison of Phase Transformations in Binary Ti-Mo and Zr-Nb Alloys
Concurrent Modeling of Martensitic Transformation and Crack Growth in Shape Memory Ceramics
Controlling Microstructure of Nanotwinned Cu by Tuning the Electroplating Temperatures and Chemical Additives
Coupled Grain Structure and Carbide Evolution during Rapid Thermal Cycling of an Fe-Cr-C Steel
Crystallographic Characteristics of γ'-Fe4N Formation Upon Nitriding of α-Fe
Defect Assisted Growth of Fine Scale Alpha in Titanium Alloys
Dislocation or Twinning Formation in Inorganic Semiconductors from Light Irradiation
Divergent Pearlite Growth in Fe-Mn-C Steel
Effect of Heat Treatments on Microstructures and Mechanical Properties of Ti-5553 Alloy
Effect of Precipitates on Martensitic Transformation in NiTiHf Shape Memory Alloys
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Exploring Phase Transformations in the Au-Zn-Al System
Fabrication of Gamma Prime Strengthened Ni-Cr-Al-Ti Microtubes via Gas-phase Deposition and the Kirkendall Effect
Formation and Stability of Ni-Y Clusters in Mg85Y9Ni6 Alloys
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In-situ X-ray Diffraction Measurement during Deformation of Austenite above the Ae3 Temperature
Interaction between Phase Transformations and Dislocation Evolution: Phase Field Approaches
Interphase Boundary Anisotropy Effects on the Microstructure Evolution in Three Phase β(In) – In2Bi – γ(Sn) Eutectic System
Iron-rich Microstructures in Post-Detonation Nuclear Debris
Lattice Boltzmann Phase-field Modelling of Solidification Process for the Ni-Nb Binary-alloy
Linear Complexion Formation and their Effect on the Strength of Metallic Alloys
Macroscopic Energy Barrier and Rate-independent Hysteresis in Martensitic Transformations
Martensitic Transformation in a Rapidly-quenched Interstitial-free Steel using a Gleeble 3800 Thermo-mechanical Simulator
Mesoscale Models for Investigating Solid-state Phase Transformations in Metal Hydrides for Hydrogen Storage
Microstructural and Mechanical Characterization of Cast Austenitic Stainless Steel Alloyed with Si
Molecular Dynamic Study the Role of the Kinetic Factor during Nucleation of Stoichiometric Compounds from Liquid
Morphological and Structural Instability of Iron-rich Precipitates in Cu-Fe-Co Alloys
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Multiphase Modeling of Artificial Aging in a Multicomponent Aluminum Alloy based on the Subcritical Growth Theory
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O-35: Bainite Formation during Zinc Galvanizing on Steel
O-36: Carbon and Microstructure Effects on the Magnetic Properties of Fe-CN Soft Magnetic Materials (Minnealloy)
O-37: Carbonation Behavior of Calcium Aluminate Cements with Additions of Silica
O-38: Dealloyed High-strength Metallic Coatings
O-39: Dilatometric Analysis of the Martensite Decomposition by Stages during Continuous Heating
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O-42: Hierarchical Microstructure Enhanced Comprehensive Mechanical Properties in Ti-Alloys
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O-45: JMA Model Application to Elucidate the Kinetic Parameters in a Silicon Steel during Continuous Heating
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The Effect of Interface Compatibility and Grain Constraint in ZrO2-based Shape-memory Ceramics
The Effects of Quenching Medium and Cooling Rates on the Phase Transformation of γ’-Fe4N to Achieve Iron Nitride Martensite
The Impact of the Cooling Rate on Controlling the Grain Boundary Morphology and the Mechanical Properties of Nickel-based Superalloys
The Validity of Additivity Rule for Pearlite Transformation in Eutectoid Steels
Thermodynamic and Kinetic Study of the fcc-B2 Phase Transformation and Consecutive Microstructural Evolution in the Ag-Cu-Pd System
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