Wang C P, Liu X J, Ohnuma I, Kainuma R, Ishida K
Department of Materials Science, Graduate School of Engineering, Tohoku University, Aoba-yama 02, Sendai 980-8579, Japan.
Science. 2002 Aug 9;297(5583):990-3. doi: 10.1126/science.1073050.
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.
一种合金包裹另一种合金的蛋型核心微观结构此前已在太空实验中获得。通过使用传统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微观结构。次要液相总是形成蛋的核心，有时还会形成壳层。这种核心微观结构的形成起源可以基于界面能对温度的依赖性，通过马兰戈尼运动来解释，这表明即使冷却速率非常高，也能形成这种类型的粉末。
