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OALib Journal期刊
ISSN: 2333-9721
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三元Fe--Sn--Si偏晶合金中的“海藻”生长形貌
, PP. 307-313
Keywords: 落管,Fe--Sn--Si,偏晶合金,快速凝固
Abstract:
采用落管方法对Fe60.4Sn29.6Si10三元偏晶合金进行了微重力条件下的无容器快速凝固实验.实验所得合金液滴的典型凝固组织呈现“枝晶”和“海藻”两种生长形貌.分析发现液滴中大量出现的“海藻”生长形貌是合金熔体凝固前沿发生尖端分裂的结果,这种特殊形貌的产生主要受过冷度、表面张力各向异性参数等因素的控制和影响.“尖端分裂”生长方式是晶粒细化的一种原因,而“海藻”生长形貌是枝晶碎断、重熔的结果.
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