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Local Ordering in Molten State and Its Legacy on Abnormal Primary Crystallization in Al RE Metallic Glasses
Date
2016-02-14
Author
Kutsal, Mustafacan
Kalay, Yunus Eren
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https://hdl.handle.net/11511/88415
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How the chemical and topological short- to medium-range order develops in Al-Tb glass and its ultimate effect on the control of the high number density of face-centered-cubic-Al (fcc-Al) nuclei during devitrification are described. A combined study using high-energy X-ray diffraction (HEXRD), atom probe tomography (APT), transmission electron microscopy and fluctuation electron microscopy (FEM) was conducted in order to resolve the local structure in amorphous Al90Tb10. Reverse Monte Carlo simulations and V...
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Al-based metallic glasses (MGs) have outstanding structural and functional properties and are of great interest in the literature and industry. The formation of metallic glasses opens up extraordinary possibilities, and the structure and structure-property relationship at the atomic level must be thoroughly studied to tailor such properties. Al-Rare Earth (RE)-based alloys form an important class of marginal glass-forming alloys in which the presence of Al nanocrystals accompanies primary crystallization. O...
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Surveillance of crowded public spaces and detection of anomalies from the video is important for public safety and security. While anomaly detection is possible by detection and tracking of individuals in low-density areas, such methods are not reliable in high-density crowded scenes. In this work we propose a holistic unsupervised approach to cluster different behaviors in high density crowds and detect the local anomalies using these clusters. Finite-Time Lyapunov Exponents (FTLE) is used for analyzing th...
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Local atomic structure in al-re marginal metallic glasses
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Partial devitrification of the Al-RE marginal metallic glasses results in anomalous nucleation rate of nanocrystals conflicting with the classical nucleation theory by several orders of magnitude. One of the theoretical approaches explaining this phenomenon is the medium-range order (MRO) structures within the range of 1-2 nm that may be present both in the quenched amorphous state and its liquid precursor. In this work, these structures have been investigated conducting both experimental methods such as hi...
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M. Kutsal and Y. E. Kalay, “Local Ordering in Molten State and Its Legacy on Abnormal Primary Crystallization in Al RE Metallic Glasses,” 2016, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/88415.