Improved Plasticity of Fe_(25)Co_(25)Ni_(25)(Si_(0.3)B_(0.7))_(25) High Entropy Bulk Metallic Glass through the Addition of Cu  

作　　者：Xueru Fan Lei Xie Qiang Li Chuntao Chang Hongxiang Li 

机构地区：[1]School of Physics Science and Technology,Xinjiang University,Urumqi 830046,China [2]School of Mechanical Engineering,Dongguan University of Technology,Dongguan 523808,China [3]State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2023年第3期417-425,共9页金属学报（英文版）

基　　金：financially supported by the Tianshan Innovation Team Program of Xinjiang Uygur Autonomous Region(No.2020D14038);the Beijing Municipal Natural Science Foundation(No.2202033).

摘　　要：This work was focused on enhancement in the plasticity of Fe_(25)Co_(25)Ni_(25)(Si_(0.3)B_(0.7))_(25) high entropy bulk metallic glass(HE-BMG)by adding minor Cu(0–1.2,in at.%).It is found that the appropriate addition of Cu can efficiently improve the plasticity of the present HE-BMG while the excessive addition of Cu will deteriorate again the plasticity,and especially,the plastic strain of the present HE-BMG is improved from 0.8%for the Cu-free alloy to 4.7%for the 0.3 at.%Cu-added alloy.The transmission electron microscopy observation shows that there are manyα-Fe(Co,Ni)clusters with sizes of less than 5 nm dispersed in the glassy matrix in the 0.3 and 0.6 at.%Cu-added alloys,which may account for the significant improvement in the plasticity of the two alloys,and further increase in Cu content more than 0.9 at.%leads to the precipitation ofα-Fe(Co,Ni)and Fe(Co,Ni)B compound grains with diameters of tens of nanometers,in which the plasticity of the present HE-BMGs has deteriorated rapidly.

关 键 词：High entropy alloys Bulk metallic glasses Glass forming ability Nano-crystallization PLASTICITY Microstructure 

分 类 号：TG139.8[一般工业技术—材料科学与工程]