Roles of alloying additions on local structure and glass-forming ability of Cu-Zr metallic glasses
Roles of alloying additions on local structure and glass-forming ability of Cu-Zr metallic glasses
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DOI：
10.1007/s10853-013-7725-7
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发表时间：
2014-01-01
影响因子：
4.5
通讯作者：
Zhou, Y. H.
中科院分区：
文献类型：
--
作者：
Lu, B. F.;Kong, L. T.;Zhou, Y. H.
为了确定合金元素M（M = Ti，Ga，Co，Fe）对Cu 50 Zr 50基合金非晶形成能力的结构作用，采用扩展X射线吸收精细结构（EXAFS）谱研究了二元和三元非晶合金的原子结构。EXAFS曲线拟合分析表明，金属玻璃的主要结构差异在于Cu中心团簇的原子堆积密度。Cu-M距离的相对缩短与Cu和M之间的混合热密切相关：混合热越负，Cu-M距离的缩短越大。在系统分析Cu-Zr基合金成分特性和GFA数据的基础上，提出了在开发大尺寸块体金属玻璃时，应选择原子尺寸分布较均匀、与主成分有较强化学作用的合金元素。
To identify the structural role of alloying element M (M = Ti, Ga, Co, Fe) on the glass-forming ability (GFA) of Cu50Zr50 base alloy, the atomic structures of the binary and ternary metallic glasses were examined by extended X-ray absorption fine structure (EXAFS) spectroscopy. The EXAFS curve-fitting analysis indicates that the main structural difference among the metallic glasses is in the atomic packing density of Cu-centered clusters. The relative shortening of the Cu-M distance is closely related to the heat of mixing between Cu and M: the more negative the heat of mixing, the larger is the shortening of the Cu-M distance. Based on a systematic analysis of the component properties and GFA data for Cu-Zr based alloys, it is suggested that alloying elements that bring a more uniform distribution of atomic size and possess strong chemical interactions with the main components should be selected in developing large-size bulk metallic glasses.