Static and Dynamic Characterization of Grain Boundary-dislocation Interaction Static and Dynamic Characterization of Grain Boundary-dislocation Interaction S. Ii and T. Hara1 S. Ii and T. Hara1 1 Research Center for Structural Materials, National Institute for Materials Science (NIMS) 1 Research Center for Structural Materials, National Institute for Materials Science (NIMS) Grain boundaries, which inevitably exist in polycrystalline engineering materials, often govern their mechanical and functional properties. Among them, the relationship between the yield stress and the Grain boundaries, which inevitably exist in polycrystalline engineering materials, often govern their grain size is well known as the Hall-Petch relation. However, the unknown physical meaning of that mechanical and functional properties. Among them, the relationship between the yield stress and the relation remains as well. Recently, we have focused on the grain boundary-dislocation interaction, which grain size is well known as the Hall-Petch relation. However, the unknown physical meaning of that is an elemental process of understanding the Hall-Petch relation, attempting to clarify from the relation remains as well. Recently, we have focused on the grain boundary-dislocation interaction, which standpoint of static, such as geometrical dislocation reaction at the grain boundary, and of dynamics of is an elemental process of understanding the Hall-Petch relation, attempting to clarify from the the microstructure evolution by the state-of-the-art in situ TEM straining experiment. It has directly standpoint of static, such as geometrical dislocation reaction at the grain boundary, and of dynamics of observed the dislocation activated at the adjoining grain by in situ straining with the simultaneous the microstructure evolution by the state-of-the-art in situ TEM straining experiment. It has directly measurement of the stress in Al bicrystal, including a single Σ3 grain boundary. The measured critical observed the dislocation activated at the adjoining grain by in situ straining with the simultaneous resolved shear stress was consistent with the estimated one from the past data obtained by the measurement of the stress in Al bicrystal, including a single Σ3 grain boundary. The measured critical macroscopic tensile tests of the bulk materials. resolved shear stress was consistent with the estimated one from the past data obtained by the The dislocation reaction at the grain boundary was also analyzed based on the slip system activated macroscopic tensile tests of the bulk materials. in both grains. That dislocation reaction process was discussed with a few models proposed so far. The The dislocation reaction at the grain boundary was also analyzed based on the slip system activated most favorable slip system for the activation in the adjoining grain depended on the models. The model in both grains. That dislocation reaction process was discussed with a few models proposed so far. The explaining our experiments was based on the geometrical viewpoint. Another model takes macroscopic most favorable slip system for the activation in the adjoining grain depended on the models. The model continuity at the boundary into account. In our experiments, the grain boundary sliding was also explaining our experiments was based on the geometrical viewpoint. Another model takes macroscopic observed at the middle and later stages of the in situ straining; that contradiction is the reason for the continuity at the boundary into account. In our experiments, the grain boundary sliding was also consistency of the models proposed so far and our experimental data. observed at the middle and later stages of the in situ straining; that contradiction is the reason for the consistency of the models proposed so far and our experimental data. Microstructure MicrostructureDiffractometer TAKU Diffractometer TAKU 1, T. Kawasaki 1, W. Gong 1 J-PARC Center, Japan Atomic Energy Agency 1, T. Kawasaki 1, W. Gong 1 J-PARC Center, Japan Atomic Energy Agency Neutron diffraction, as a powerful microstructure probe, is reliable for tracking globally averaged crystallographic information associated with microstructure evolution and deformation behavior in Neutron diffraction, as a powerful microstructure probe, is reliable for tracking globally averaged structural materials. TAKUMI [1], is a neutron diffractometer for engineering materials studies at MLF, crystallographic information associated with microstructure evolution and deformation behavior in J-PARC, covering a wide d-range with a good balance between high neutron flux and high resolution. structural materials. TAKUMI [1], is a neutron diffractometer for engineering materials studies at MLF, Additionally, a variety of specific sample environments at TAKUMI enable the in situ studies under J-PARC, covering a wide d-range with a good balance between high neutron flux and high resolution. extreme conditions, such as cryogenic deformation (10K~), thermomechanical controlled processes Additionally, a variety of specific sample environments at TAKUMI enable the in situ studies under (~1473K), fatigue, etc. Crystallographic information including phase fraction, lattice strain (stress), extreme conditions, such as cryogenic deformation (10K~), thermomechanical controlled processes texture, dislocation density, stacking fault probability, etc., obtained by neutron diffraction can uniquely (~1473K), fatigue, etc. Crystallographic information including phase fraction, lattice strain (stress), provide insights into microstructure evolution and deformation mechanisms in bulky materials. Various texture, dislocation density, stacking fault probability, etc., obtained by neutron diffraction can uniquely in situ studies on various metallic materials, as well as ex situ measurements, such as residual stress provide insights into microstructure evolution and deformation mechanisms in bulky materials. Various mapping and microstructure characterization for specific purposes, have been conducted. In the in situ studies on various metallic materials, as well as ex situ measurements, such as residual stress presentation, the specifications of the diffractometer TAKUMI and several recent studies on deformation mapping and microstructure characterization for specific purposes, have been conducted. In the mechanisms in metallic materials using in situ neutron diffraction will be introduced. presentation, the specifications of the diffractometer TAKUMI and several recent studies on deformation mechanisms in metallic materials using in situ neutron diffraction will be introduced. Reference: [1] BL19 TAKUMI website: https://mlfinfo.jp/en/bl19/ Reference: This study got partially support from MEXT Program: Data Creation and Utilization Type Material [1] BL19 TAKUMI website: https://mlfinfo.jp/en/bl19/ Research and Development (JPMXP1122684766). This study got partially support from MEXT Program: Data Creation and Utilization Type Material Research and Development (JPMXP1122684766). 50PP22--1133 PP22--1133 PP22--1144 PP22--1144 Characterization through in Situ Neutron Diffraction with Characterization through in Situ Neutron Diffraction with MI MI W. W. Poster Presentation ｜NIMS Award Symposium 2023Mao 1, T. Ito 1 and S. Harjo 1 Mao 1, T. Ito 1 and S. Harjo 1 P2 ｜ Characterization
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