Cluster formulae for metallic glasses derived from devitrification phases |
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| Authors: | Jixiang Chen Qing Wang Yingmin Wang Jianbing Qiang Fengwei Li Chunlei Zhu |
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| Institution: | 1. Key Laboratory for Materials Modification by Laser , Ion and Electron Beams (Ministry of Education), Dalian University of Technology , Dalian 116024 , China;2. Department of Physics , Dalian Maritime University , Dalian 116026 , China;3. Key Laboratory for Materials Modification by Laser , Ion and Electron Beams (Ministry of Education), Dalian University of Technology , Dalian 116024 , China |
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| Abstract: | Bulk metallic glasses are known to have a composition formula cluster](glue atom)1,3 within the framework of the cluster-plus-glue-atom model. The key issue in applying the cluster formula is the determination of the right clusters and glue atoms. As examples, alloy phases in the glass-forming systems Al–Ni–Zr and B–Co–Si are analysed from the viewpoint of nearest coordination polyhedral clusters. These alloy phases are described by effective cluster](glue atom) x , where the effective cluster refers to true cluster composition after taking account of cluster-sharing in the phase structure. For each alloy phase, a principal cluster can be identified that features the local short-range order of that phase. It is pointed out that the principal clusters can express compositions with high glass-forming abilities, as verified by our experiments in Al–Ni–Zr and B–Co–Si–Ta. |
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| Keywords: | clusters cluster formula alloy phases structure amorphous alloys |
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