Local atomic structure in Al-RE marginal metallic glasses

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Mühendislik Fakültesi, Metalurji ve Malzeme Mühendisliği Bölümü, Türkiye

Tezin Onay Tarihi: 2016

Öğrenci: MERT ÖVÜN

Danışman: YUNUS EREN KALAY

Özet:

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 high energy X-ray diffraction (HEXRD) using synchrotron radiation, and computational methods as molecular dynamics (MD) , Monte Carlo (MC) and reverse Monte Carlo (RMC) simulation techniques. In order to make molecular simulations, interatomic potentials based on diffraction experiments have been developed. This work was partially supported by the Scientific and Technological Research council of Turkey (TÜBİTAK) under Grant No. 113M346.