Formation of immiscible alloy powders with egg-type microstructure
Formation of immiscible alloy powders with egg-type microstructure
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DOI：
10.1126/science.1073050
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发表时间：
2002-08-09
期刊：
影响因子：
56.9
通讯作者：
Ishida, K
中科院分区：
文献类型：
--
作者：
Wang, CP;Liu, XJ;Ishida, K
蛋型核心微观结构，其中一种合金包裹着另一种合金，以前在太空实验中获得过。通过使用常规气体雾化制备的铜-铁基合金，我们能够在重力条件下获得这种显微组织。少量的液相总是形成蛋的核心，有时也形成壳层。这种核心微结构的形成的起源可以解释为Marangoni运动的基础上的界面能的温度依赖性，这表明，这种类型的粉末可以形成，即使冷却速率非常高。
The egg-type core microstructure where one alloy encases another has previously been obtained during experiments in space. Working with copper-iron base alloys prepared by conventional gas atomization, we were able to obtain this microstructure under gravity conditions. The minor liquid phase always formed the core of the egg, and it sometimes also formed a shell layer. The origin of the formation of this core microstructure can be explained by Marangoni motion on the basis of the temperature dependence of the interfacial energy, which shows that this type of powder can be formed even if the cooling rate is very high.