Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, P.R. China.
Nanoscale. 2018 Jan 25;10(4):1912-1919. doi: 10.1039/c7nr07281c.
In the past three decades, nanostructured (NS) and ultrafine-microstructure (UFM) materials have received extensive attention due to their excellent mechanical properties such as high strength. However, preparing low-cost and bulk NS and UFM materials remains to be a challenge, which limits their industrial applications. Here, we report a new strategy to prepare bulk UFM alloys via the direct solidification of high-entropy alloys (HEAs). As a proof of concept, we designed AlCoCrFeNi (1.8 ≤ x ≤ 2.0) HEAs and achieved a complete UFM in bulk materials. The compositional requirements for obtaining the formation of the UFM are highly demanding, necessitating the coupling of near eutectic alloy composition and the high temperature decomposition of supersaturated primary and secondary phases. Our strategy provides a low-cost and highly efficient method to prepare bulk UFM alloys, with great potential to accelerate the engineering application of these materials.
在过去的三十年中，由于具有高强度等优异的力学性能，纳米结构（NS）和超细微观结构（UFM）材料受到了广泛关注。然而，制备低成本和大块 NS 和 UFM 材料仍然是一个挑战，这限制了它们的工业应用。在这里，我们报告了一种通过直接凝固高熵合金（HEAs）来制备大块 UFM 合金的新策略。作为概念验证，我们设计了 AlCoCrFeNi（1.8≤x≤2.0）HEAs，并在块状材料中实现了完全的 UFM。获得 UFM 形成的成分要求非常高，需要近共晶合金成分和过饱和初生相与次生相高温分解的结合。我们的策略为制备大块 UFM 合金提供了一种低成本、高效率的方法，有望加速这些材料的工程应用。
