Eutectic high entropy alloy syntactic foam  

作　　者：Jin Meng Yu Qiao Tian-Wei Liu Yuan-Yuan Tan Fu-Hua Cao Yan Chen Hai-Ying Wang Lan-Hong Dai 

机构地区：[1]State Key Laboratory of Nonlinear Mechanics,Institute of Mechanics,Chinese Academy of Sciences(CAS),Beijing 100190,China [2]State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China [3]School of Engineering Science,University of Chinese Academy of Sciences,Beijing 101408,China [4]CAS Key Laboratory of Mechanical Behavior and Design of Materials,Department of Modern Mechanics,University of Science and Technology of China,Hefei 230027,China

出　　处：《Journal of Materials Science & Technology》2023年第18期177-189,共13页材料科学技术（英文版）

基　　金：supported by the NSFC Basic Science Cen-ter Program for“MultiscaleProblems inNonlinear Mechanics”(No.11988102);the NSFC(Nos.11790292,11972346 and 11672316);Ye Qisun Science Foundation of NSFC(No.U2141204);the Key Research Program of the Chinese Academy of Sciences(No.ZDRW-CN-2021-2-3);the Strategic Priority Research Program of the Chinese Academy of Sciences(Nos.XDB22040302 and XDB22040303).

摘　　要：High-strength metallic foams have a wide range of applications in engineering as lightweight structural and energy-absorbing materials.However,it is challenging to obtain metallic foam with both good energy absorption performance and high strength.Here,we developed a novel metal matrix syntactic foam fabri-cated with AlCoCrFeNi_(2.1) eutectic high entropy alloy and alumina cenospheres that exhibits a remarkable combination of high strength and energy absorption performance under both quasi-static and dynamic compression.The porous structure of syntactic foam fully exploits the properties of the AlCoCrFeNi_(2.1) alloy matrix with a unique FCC/B2 dual-phase eutectic microstructure and thus yields exceptional per-formance.We discovered that this dual-phase microstructure not only provides high strength but also allows the pores to collapse in a progressive and diffusive way,which enables the formation of a high and smooth energy absorption platform.It is found that the heterogeneity between the two phases in the matrix can provide back stress strengthening,and it also induces multiple micro shear bands and microcracks as additional energy dissipation modes as the deformation proceeds.This unique mechanism ensures the strength of microstructures and makes them fracture promptly,which causes the balance of strengthening and softening on the macro scale.This work opens the avenue for developing advanced high-strength lightweight structural and energy-absorbing materials.

关 键 词：Eutectic high entropy alloy FOAMS Metal matrix composites(MMCs) Energy absorption 

分 类 号：TG139[一般工业技术—材料科学与工程]