Metastable coupled-growth kinetics between primary and peritectic phases of undercooled hypoperitectic Fe54.5Ti45.5 alloy
Metastable coupled-growth kinetics between primary and peritectic phases of undercooled hypoperitectic Fe54.5Ti45.5 alloy
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过冷亚包晶Fe54.5Ti45.5合金初生相和包晶相之间的亚稳态耦合生长动力学
DOI：
10.1063/1.4964740
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发表时间：
2016-10
影响因子：
4
通讯作者：
Wei B.
中科院分区：
文献类型：
--
作者：
Wu Y. H.;Chang J.;Wang W. L.;Wei B.
采用电磁悬浮和滴管技术系统地研究了过冷Fe54.5Ti45.5合金初生Fe2Ti和包晶FeTi之间的亚稳耦合生长动力学。利用高速摄像机记录了悬浮体合金在34 ~ 187k过冷范围内的快速结晶过程。在143k以下的小过冷状态下，进行了包晶凝固，初生Fe2Ti枝晶生长速度V与整体过冷ΔT的关系满足V = 2.43 × 10−14 × ΔT7.72 （mm s−1）的幂函数关系。当液体过冷超过143 K时，诱导亚稳态耦合生长，微观结构表现为Fe2Ti棒嵌入FeTi相。根据V = 1.47 × 103-7.44ΔT (mm s−1)，耦合生长速度随过冷度的增加而线性降低。在滴管实验中，合金小液滴的包晶凝固特性消失，p…
The metastable coupled-growth kinetics between the primary Fe2Ti and peritectic FeTi phases of undercooled Fe54.5Ti45.5 alloy was systematically investigated by both electromagnetic levitation and drop tube techniques. Employing a high-speed camera, the rapid crystallization processes of levitated bulk alloy were recorded in the undercooling range of 34–187 K. In small undercooling regime below 143 K, peritectic solidification proceeded and the dependence of primary Fe2Ti dendritic growth velocity V on the bulk undercooling ΔT satisfied a power relation of V = 2.43 × 10−14 × ΔT7.72 (mm s−1). Once liquid undercooling increased beyond 143 K, the metastable coupled-growth was induced and the microstructure was characterized by the Fe2Ti rods embedded in FeTi phase. Furthermore, the coupled-growth velocity decreased linearly with the rise in undercooling according to V = 1.47 × 103-7.44ΔT (mm s−1). In drop tube experiment, peritectic solidification characteristics of small alloy droplets disappeared and the p...
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DOI：
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发表时间：
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期刊：
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影响因子：
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通讯作者：
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