Al_xCoCrCuFeNi多主元高熵合金的微观结构和力学性能  

Microstructure and Mechanical Performance of Al_xCoCrCuFeNi High-Entropy Alloys

作　　者：刘源[1] 陈敏[1] 李言祥[1] 陈祥[1] 

机构地区：[1]清华大学先进成形制造教育部重点实验室,北京100084

出　　处：《稀有金属材料与工程》2009年第9期1602-1607,共6页Rare Metal Materials and Engineering

基　　金：清华大学基础研究基金资助项目(JCqn2005012)

摘　　要：研究了不同Al含量的AlxCoCrCuFeNi多主元高熵合金的微观组织和力学性能。结果表明:微观组织为简单的枝晶和枝晶间组织。当Al含量较低时,合金的晶格结构为单一的FCC相。随着Al含量的增加,原本单一的FCC相逐步转化为FCC相和有序BCC相共同组成的组织。高熵效应以及元素扩散的困难使合金形成了简单的固溶体结构,同时伴随有纳米第二相的析出。与此同时,随着Al含量的增加,合金的硬度HV有了显著的提高,从1530MPa提高到7350MPa,相应地,合金由塑性材料变为中低温脆性材料。The microstructure and mechanical properties of AlxCoCrCuFeNi with different Al content have been studied. The results showed that the microstructures exhibit simple dendrite and interdendrite structures. When the content of aluminum was low, the alloy was composed of a simple FCC solid-solution structure. As the aluminum contents increasing, a BCC structure appeared. The high entropy effects and sluggish diffusion enhance the formation of simple solid-solution phases and submicron structures with nanoprecipitates in the alloys. With the addition of aluminum from x=0 to 3.0, the hardness of the alloys increase from 1530 to 7350 MPa Correspondingly, the alloy＇s deformability falls and transfers from ductile materials to brittle materials at moderate temperatures.

关 键 词：多主元合金 高熵合金 微观结构 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]