Graded microstructures of Al-Li-Mg-Zn-Cu entropic alloys under supergravity  

超重力场下Al-Li-Mg-Zn-Cu多组元合金的梯度结构（英文）

作　　者：Ruixuan Li Zhe Wang Zhancheng Guo Peter K. Liaw Tao Zhang Lugee Li Yong Zhang 李蕊轩;王哲;郭占成;Peter K.Liaw;张涛;李扬德;张勇(State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing;Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science, University of Science and Technology Beijing;State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing;Department of Materials Science and Engineering, The University of Tennessee;Dongguan EON Institute for Advanced Materials)

机构地区：[1]State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing [2]Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science, University of Science and Technology Beijing [3]State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing [4]Department of Materials Science and Engineering, The University of Tennessee [5]Dongguan EON Institute for Advanced Materials

出　　处：《Science China Materials》2019年第5期736-744,共9页中国科学（材料科学（英文版）

基　　金：the financial support from the National Natural Science Foundation of China (NSFC, 51471025 and 51671020)

摘　　要：Investigating the microstructures and properties of gradient materials has been regarded as a promising way to accelerate the identification of optimal compositions for applications. Herein, a supergravity method is applied to prepare the graded entropic alloys Al-Zn-Li-Mg-Cu. Through carefully optimizing the experimental conditions, the graded microstructures and hardness values appear after the supergravity technique. The morphology of the alloy significantly changes from the bulk intermetallics to eutectic structures along the supergravity force direction, which results from the crushed and graded aluminum oxide combined with the extremelystrong force. The results show that with this supergravity method, a performance-enhanced alloy can potentially be achieved through the centrifugation in a short time span and thus it paves the way for designing and synthesizing entropic alloys with intriguing properties.研究梯度材料的组织结构及其性能可以加速开发具有优异性能的新成分材料.本文提出一种新方法来制备梯度多组元合金Al-Li-Mg-Zn-Cu——超重力法(即离心).通过实验条件的优化和系统的表征,我们发现超重力处理后出现了梯度组织结构和硬度值.沿着超重力方向,合金的组织结构从大块金属间化合物转化为共晶结构,同时铝的氧化物也在离心中被打碎并沿着这一方向梯度分布.实验结果表示,通过短时间离心的超重力方法有望提升合金综合性能并加快高性能多组元合金的开发.

关 键 词：entropic alloys SUPERGRAVITY graded microstructures grain refinement viscosity 

分 类 号：TG146.21[一般工业技术—材料科学与工程]