Metastable monotectic phase separation in Co–Cu alloys
Metastable monotectic phase separation in Co–Cu alloys
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DOI：
10.1007/s10853-018-2417-y
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发表时间：
2018-05
影响因子：
4.5
通讯作者：
O. Jegede;R. Cochrane;A. Mullis
中科院分区：
文献类型：
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作者：
O. Jegede;R. Cochrane;A. Mullis
使用 6.5 m 落管设施研究了亚稳态偏晶 Co-Cu 合金的液相分离行为与冷却速率的函数关系。观察到一系列液相分离形态，包括稳定的两层核壳、演化的核壳和树枝状结构。研究发现，在核壳结构中，无论核和壳的体积分数如何，核始终处于较高熔点（富钴）相。在 Cu-50 at% Co 合金中，观察到高冷却速率会产生两次液相分离，对应于双节线，随后发生旋节线分解。所得结构包含核-壳结构，其中富Co核包含非常精细的富Cu颗粒分散体，而富Cu壳可能包含或不包含类似的富Co颗粒分散体。
The liquid phase separation behaviour of metastable monotectic Co–Cu alloys was investigated as a function of cooling rate using a 6.5 m drop-tube facility. A range of liquid phase separated morphologies were observed including stable two-layer core–shell, evolving core–shell and dendritic structures. It was found that in the core–shell structures the core was always in the higher melting point (Co-rich) phase, irrespective of the core and shell volume fraction. In Cu–50 at% Co alloy, high cooling rates were observed to yield two episodes of liquid phase separation, corresponding to binodal, followed by spinodal decomposition. The resulting structure comprised a core–shell structure in which the Co-rich core contained a very fine dispersion of Cu-rich particles with a Cu-rich shell which may, or may not, contain a similar dispersion of Co-rich particles.