The angular deviations and influential factors of Burgers orientation relationship(BOR)in Ti-6Al-4V and Ti-6.5Al-2Zr-1Mo-1V alloys were investigated by optical microscope(OM),scanning electron microscope(SEM),electron...The angular deviations and influential factors of Burgers orientation relationship(BOR)in Ti-6Al-4V and Ti-6.5Al-2Zr-1Mo-1V alloys were investigated by optical microscope(OM),scanning electron microscope(SEM),electron backscattered diffraction(EBSD)and high-angle annular dark-field scanning transmission electron microscope(HAADF-STEM).A spherical center angle model was introduced to calculate the angular deviations from the ideal BOR between α and β phases.The results indicate thatαand β phases in α colonies of both alloys do not follow the perfect BOR during β→α phase transformation,with angular deviation values less than 3°.Through detailed microstructure characterization,the broad face of α/β interfaces viewed along two different electron incident directions shows the atomic-scale terrace-ledge structure,and many dislocations are observed within α and β phases and near α/β interfaces.Further studies reveal that the angular deviations mainly originate from lattice distortions caused by dislocations in α and β phases and lattice mismatches at α/β interfaces.展开更多
Traditional controlled source electromagnetic methods(CSEM)typically collect specific single-component of the total magnetic field intensity,leading to zero-value bands,narrow azimuthal detection ranges,and angular de...Traditional controlled source electromagnetic methods(CSEM)typically collect specific single-component of the total magnetic field intensity,leading to zero-value bands,narrow azimuthal detection ranges,and angular detections.An innovative detection strategy that utilized both the horizontal and total magnetic field intensities was introduced in this work.Numerical simulations were conducted to analyze the impact of sensor angular deviations on single-component and horizontal magnetic field intensities.Notably,the horizontal magnetic field intensity remains unaffected by horizontal angle deviations,while the total magnetic field shows resilience to all angular deviations.Theoretically,orthogonal magnetic sensors could facilitate wide-azimuth magnetic field detection.Results from field experiments revealed a pronounced anomaly response of both the horizontal and total magnetic field intensities to underground caverns.These experiments demonstrated a significant reduction in issues related to angular deviations in magnetic sensors and confirmed the feasibility of wide-azimuth magnetic field detection.The proposed wide-azimuth detection method has the potential to extend the detectable angle from that of CSEM to 360°,resolves the issue of angular deviation of magnetic sensors,and thus improves the detection accuracy.展开更多
基金supported by the National Natural Science Foundation of China(Nos.51971009,12002013,51831006)the Natural Science Foundation of Zhejiang Province,China(No.LZ23E010004).
文摘The angular deviations and influential factors of Burgers orientation relationship(BOR)in Ti-6Al-4V and Ti-6.5Al-2Zr-1Mo-1V alloys were investigated by optical microscope(OM),scanning electron microscope(SEM),electron backscattered diffraction(EBSD)and high-angle annular dark-field scanning transmission electron microscope(HAADF-STEM).A spherical center angle model was introduced to calculate the angular deviations from the ideal BOR between α and β phases.The results indicate thatαand β phases in α colonies of both alloys do not follow the perfect BOR during β→α phase transformation,with angular deviation values less than 3°.Through detailed microstructure characterization,the broad face of α/β interfaces viewed along two different electron incident directions shows the atomic-scale terrace-ledge structure,and many dislocations are observed within α and β phases and near α/β interfaces.Further studies reveal that the angular deviations mainly originate from lattice distortions caused by dislocations in α and β phases and lattice mismatches at α/β interfaces.
基金financially supported by the National Key Research and Development Program of China(No.2022YFC2903704)the Hunan Provincial Science and Technology Innovation Program,China(No.2023RC1014)+1 种基金the Fundamental Research Funds for the Central Universities of Central South University,China(No.2023ZZTS0441)the Hunan Provincial Natural Science Foundation of China(Nos.2023JJ40222,2024AQ2002)。
文摘Traditional controlled source electromagnetic methods(CSEM)typically collect specific single-component of the total magnetic field intensity,leading to zero-value bands,narrow azimuthal detection ranges,and angular detections.An innovative detection strategy that utilized both the horizontal and total magnetic field intensities was introduced in this work.Numerical simulations were conducted to analyze the impact of sensor angular deviations on single-component and horizontal magnetic field intensities.Notably,the horizontal magnetic field intensity remains unaffected by horizontal angle deviations,while the total magnetic field shows resilience to all angular deviations.Theoretically,orthogonal magnetic sensors could facilitate wide-azimuth magnetic field detection.Results from field experiments revealed a pronounced anomaly response of both the horizontal and total magnetic field intensities to underground caverns.These experiments demonstrated a significant reduction in issues related to angular deviations in magnetic sensors and confirmed the feasibility of wide-azimuth magnetic field detection.The proposed wide-azimuth detection method has the potential to extend the detectable angle from that of CSEM to 360°,resolves the issue of angular deviation of magnetic sensors,and thus improves the detection accuracy.
