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Meeting Materials Science & Technology 2019
Symposium Phase Transformations in Ceramics: Science and Applications
Presentation Title In Situ Investigation of Stress-Induced Martensitic Transformation in Granular Shape Memory Ceramics
Author(s) Hunter Rauch, Yan Chen, Ke An, Hang Yu
On-Site Speaker (Planned) Hang Yu
Abstract Scope Stress-induced martensitic transformation readily occurs in granular shape memory materials, when individual particles experience high stresses and transform from a high-symmetry austenite phase to a low-symmetry martensite phase. Compared to monolithic solids, however, the driving force is highly heterogeneous and the mechanical constraint for martensite nucleation is low. Using in situ neutron diffraction, here we study this phenomenon in granular shape memory ceramics consisting of single-crystal micro-particles of ZrO2-12at%CeO2 and ZrO2-15at%CeO2. By examining how the phase fraction, lattice strain, and integral peak broadness evolve during external loading, unloading, and subsequent heating, several peculiar features are discovered, such as continuous mode of transformation and strong correlation between the peak broadening and the transformed phase fraction. We discuss the mechanism for martensite nucleation and growth in granular packings and propose a model for stress-induced martensitic transformation in granular shape memory materials.
Proceedings Inclusion? Definite: At-meeting proceedings

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Advances in Experimental Techniques for Investigating Microstructure Dependent Phase Transformations
Avoiding Transformation-induced Cracking in ZrO2 Shape-memory Ceramics: Constraints, Surfaces and Interfaces
Changes to the local environment during the entropic phase transformation in high entropy oxides.
Direct conversion of heat to electricity using first-order phase transformations in ferroelectrics
Effect of Microstructure on Cyclic Phase Transformation Behavior in Shape Memory Zirconia
Exploring 3-D Reciprocal Space: a Powerful Tool to Answer Basic and Applied Materials Science Questions at 33BM APS
Ferroelectric Phase Transition in Tungsten Trioxide Gas Sensors
First-principles investigation of phonon instabilities and displacive phase transitions in CaTiO3-perovskites
First principles investigation into the phase stability and enhanced hardness of TiN-ScN and TiN-YN alloys
In-Situ Observations of Phase Transformations on Individual Particles of a Cu/Fe Oxygen Carrier during High-Temperature Oxidation and Reduction Cycles
In-Situ Phase Diagram Determination of the HfO2-Ta2O5-TiO2 Ternary Up to 3000 ˚C
In-situ X-ray characterization of phase evolution during solid-state synthesis of multicomponent systems
In Situ Investigation of Stress-Induced Martensitic Transformation in Granular Shape Memory Ceramics
Influence of Annealing Temperature and Time on Phase Stability and Fracture Toughness of Rare-earth Stabilized Zirconia
Investigations on the glass transition and crystallisation behavior of glasses by oscillatory rheometry
Meso- and Micro-structural Design and Processing of Shape-Memory and Superelastic Bulk Ceramics
Phase Transformations in High-entropy, Lanthanide Oxides
Phase transitions in hollandite oxides with nanoscale chemical ordering
Precipitation in Metal-Ceramic Systems Under Reducing Conditions
Prediction of Diffusionless Phase Transformation by Determination of the Orientation Relationship, Shear, and Motif Translation with the Smallest Atom Shuffles
Pseudo-Single Crystal Growth of Cobalt Dititanate, an Entropy Stabilized Compound
Reactive Texturing of Yttria and Ceria TZP in a Strong Magnetic Field
Realizing novel defect ordering in yttria stabilized zirconia via ion radiation
Single Phase Spinel Produced from Powders of Alumina and Magnesia in Reactive Flash Sintering
The Effect of Zr4+ Co-Substitution on the Phase Transition and Thermal Expansion Properties of RENbO4 Materials (RE = La3+, Dy3+, Y3+)
Thermal Expansion and Phase Transformation Mechanism in the Lanthanide Di-titanate System
Topotactic Motif and Orientation Relation Extraction for Phase Transformations from In-Situ X-ray Powder Diffraction
Unraveling stress-induced structure evolution in functional oxides using in-situ neutron diffraction

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