It is very difficult to manufacture oxide nanoparticle strengthened alloys through the conventional casting in the gravity field or even in the space microgravity environment. A thermite reaction process was used to produce molten metal that was then solidified in a graphite mold in super gravity field caused by centrifugal force; we were able to obtain Al _2O _3 nanoparticle reinforced Fe-based alloys. The formation of Al _2O _3 nanoparticles was related to the addition of TiO _2 xerogel to the thermite mixture, and their uniform distribution in the alloy can be explained by their assembly in (Ni, Fe)Al intermetallics during solidification owing to the low interfacial energy between them.
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机译：在重力场中或什至在空间微重力环境中，通过常规铸造来制造氧化物纳米粒子强化合金是非常困难的。利用铝热反应过程生产熔融金属，然后在离心力作用下的超重力场中将其固化在石墨模具中。我们能够获得Al _2O _3纳米颗粒增强铁基合金。 Al _2O _3纳米粒子的形成与向铝热剂混合物中添加TiO _2干凝胶有关，并且由于界面能低，在凝固过程中它们在（Ni，Fe）Al金属间化合物中的组装可以解释它们在合金中的均匀分布。它们之间。
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