董闯

个人信息Personal Information

教授

博士生导师

硕士生导师

性别:男

毕业院校:法国洛林国立综合理工学院

学位:博士

所在单位:材料科学与工程学院

电子邮箱:dong@dlut.edu.cn

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Cluster formulae for metallic glasses derived from devitrification phases

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论文类型:期刊论文

发表时间:2012-01-01

发表刊物:PHILOSOPHICAL MAGAZINE

收录刊物:SCIE、EI、Scopus

卷号:92

期号:34

页面范围:4300-4319

ISSN号:1478-6435

关键字:clusters; cluster formula; alloy phases; structure; amorphous alloys

摘要: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.