Correlation between deformation behavior and atomic-scale heterogeneity in Fe-based bulk metallic glasses  

作　　者：Jing Zhou Siyi Di Baoan Sun Qiaoshi Zeng Baolong Shen 

机构地区：[1]School of Materials Science and Engineering,Jiangsu Key Laboratory for Advanced Metallic Materials,Southeast University,Nanjing 211189,China [2]Institutes of Physics,Chinese Academy of Sciences,Beijing 100190,China [3]Institute of Massive Amorphous Metal Science,China University of Mining and Technology.Xuzhou 221116,China

出　　处：《Journal of Materials Science & Technology》2021年第6期54-60,共7页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.51631003 and 51871054);the Fundamental Research Funds for the Central Universities(Grant No.2242019k1G005);supported by the Department of Energy(DOE)Office of Science(DE-AC02-06CH11357)。

摘　　要：The correlation betweent deformation behavior and atomic-scale heterogeneity of bulk metallic glasses(BMGs)is critical to understand the BMGs'deformation mechanism.In this work,three typical[(Fe_(0.5)Co_(0.5))_(0.75)B_(0.2)Si_(0.05)]_(96)Nb_4,Fe_(39)Ni_(39)B_(14.2)Si_(2.75)P_(2.75)Nb_(2.3),and Fe_(50)Ni_(30)P_(13)C_(7)BMGs exhibiting different plasticity were selected,and the correlation between deformation behavior and atomic-scale heterogeneity of Fe-based BMGs was studied.It is found that the serrated flow dynamics of Fe-based BMGs transform from chaotic state to self-organized critical state with increasing plasticity.This transformation is attributed to the increasing atomic-scale heterogeneity caused by the increasing free volume and short-to-medium range order,which facilitates a higher frequency of interaction and multiplication of shear bands,thereby results in a brittle to ductile transition in Fe-based BMGs.This work provides new evidence on heterogeneity in plastic Fe-based BMGs from the aspects of atomic-scale structure,and provides new insight into the plastic deformation of Fe-based BMGs.

关 键 词：Fe-based BMG PLASTICITY Serrated flow behavior ATOMIC-SCALE HETEROGENEITY 

分 类 号：TG139.8[一般工业技术—材料科学与工程]