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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium Solid State Precipitation
Presentation Title Hydride Precipitates in Zirconium Alloys: Evolution of Dissolution and Precipitation Temperatures during Thermal Cycling Correlated to Microstructure Features
Author(s) Egle Conforto, Stephane Cohendoz, Patrick Girault, Cyril Berziou, Xavier Feaugas
On-Site Speaker (Planned) Egle Conforto
Abstract Scope The fast and spontaneous hydrogen diffusion in zirconium alloys used in nuclear industry leads to the hydride precipitation which is often pointed as causing embrittlement and rupture. Our studies using XDR, TEM and SEM-EBSD have been demonstrating that the nature of the hydride phase precipitated depends on the hydrogen content and can show crystallographic orientation relationships (ORs) with the substrate. DSC has been used to identify the dissolution and precipitation energies at global scale. The difference of both can be associated to the misfit dislocation contribution to the precipitation. Local TEM “in-situ” dissolution observations confirm the dissolution temperature identified at global scale and demonstrate the fact that part of misfit dislocations can be depinning during dissolution process. The consequence of this mechanism is that dissolution and precipitation temperatures shift during thermal cyclic loading. This situation will be correlated to the nature of crystallographic hydride phases and their ORs.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

An Experimental and Modelling Study on Precipitation during Tempering of Martensitic Alloys
Analysis of Crystal Structures with Icosahedral Local Order in Al-Fe-V-Si Alloys After Solidification at Intermediate Cooling Rates
Atom Probe Characterization of Phase Separation during Age Hardening of a U-6wt.%Nb Alloy
Atomic Theory of Spinodal Decomposition
Carbide Precipitation during Heating in Martensitic Steels
Clustering and Precipitation in Al-Cu-Li Alloys: Influence of Minor Solute Additions on the Competition between Kinetic Paths
Effect of Ca Additions on the Ageing Behavior of Mg-15Gd-0.5Zr Alloy
Effect of Metalloid Addition on Anomalous Primary Crystallization of Al-RE Metallic Glasses
Effects of Clustering and Trace Elements on Precipitation Hardening of Al-Mg-Si Alloys
Formation of Complex Intermetallic Phases from Supersaturated Co Solid Solution in a Co-3.9Nb Alloy
Hydride Precipitates in Zirconium Alloys: Evolution of Dissolution and Precipitation Temperatures during Thermal Cycling Correlated to Microstructure Features
Investigating the Formation Path of Delta Hydrides in Zirconium Fuel Rod Claddings by Multi-Phase Field Modeling
Kinetics of Discontinues Precipitation upon Age-hardening of Deformed and Recrystallized Invar-Sn Alloys
L-183: Analysis of Beta´ Cu4Ti Precipitation in Cu-Ti Alloys by Conventional and Diffusion-couple Methods
L-184: Carbide Precipitation in a Low-alloy Ferritic Steel
L-185: Nanocomposites Ti/B/TiO2 by Mechanical Alloy Synthesis
Morphology and Phase Stability of Pt Nanostructures in Dense Transition Alumina Formed by Solid-state Precipitation
Precipitate Structures in Mg Alloys Containing Nd and Y
Precipitation Behavior in Ni-Ti-Zr Shape Memory Alloys
Predicting Orientation Relationships: A Simple Algorithm for Generating Near-coincidence Site Lattices in General Bravais Lattice Systems
Prediction of Size, Temperature and Composition-dependent Precipitate/Matrix Interfacial Energies
Self-organization by Strain Accommodation in the Formation of Long-range Stacking Order Structure in Mg-RE-TM Alloys
Spinodal Decomposition and Ordering Transformation in U6Nb Alloy
The Effects of ECAP on the Precipitation Behavior of Al 2024
The Role of Electron Microscopy in the Understanding of Precipitation in Light Alloys
Understanding the Precipitation and Orientation Relationships in Transition Metal Carbides and Nitrides

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