Universality of slip avalanches in a ductile Fe-based bulk metallic glass  

作　　者：Jiao-jiao Li Jun-wei Qiao Karin A.Dahmen Wei-ming Yang Bao-long Shen Ming-wei Chen 

机构地区：[1]Laboratory of Applied Physics and Mechanics of Advanced Materials,College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China [2]Key Laboratory of Interface Science and Engineering in Advanced Materials,Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China [3]Department of Physics,University of Illinois at Urbana-Champaign,Illinois 61801,USA [4]State Key Laboratory for Geomechanics and Deep Underground Engineering,School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China [5]School of Materials Science and Engineering,Southeast University,Nanjing 211189,Jiangsu,China [6]Advanced Institute for Materials Research,Tohoku University,Sendal 980-8577,Japan

出　　处：《Journal of Iron and Steel Research International》2017年第4期366-371,共6页

基　　金：the financial support of National Natural Science Foundation of China(No.51371122);the financial support of National Natural Science Foundation of China(No.51501220);the Youth Natural Science Foundation of Shanxi Province,China(No.2015021005);the Natural Science Foundation of Jiangsu Province(BK20150170)

摘　　要：Intermittent serrated flows of a novel ductile Fe60Ni20P13C7 bulk metallic glass（BMG）at variant strain rates were investigated by statistics analysis.Peak and clutter distribution of slip-avalanche magnitudes are displayed during stable plastic flows at strain rates of 2×10-4 s-1 and 5×10-5 s-1,respectively,which means that serration behavior depends on the strain rate.However,the remarkable agreement between measured slip-avalanche magnitudes and the scaling behavior,i.e.a universal complementary cumulative distribution function（CCDF）predicted by mean-field theory（MFT）model,indicates that the plasticity of the present Fe-based BMGs can be tuned by imposed strain rates：Smax^6）ε-λ.This tuned plasticity is elucidated with expended free-volume model.Moreover,the scaling behavior of serrated flows for other strain rates can be predicted as well.Intermittent serrated flows of a novel ductile Fe60Ni20P13C7 bulk metallic glass（BMG）at variant strain rates were investigated by statistics analysis.Peak and clutter distribution of slip-avalanche magnitudes are displayed during stable plastic flows at strain rates of 2×10-4 s-1 and 5×10-5 s-1,respectively,which means that serration behavior depends on the strain rate.However,the remarkable agreement between measured slip-avalanche magnitudes and the scaling behavior,i.e.a universal complementary cumulative distribution function（CCDF）predicted by mean-field theory（MFT）model,indicates that the plasticity of the present Fe-based BMGs can be tuned by imposed strain rates：Smax^6）ε-λ.This tuned plasticity is elucidated with expended free-volume model.Moreover,the scaling behavior of serrated flows for other strain rates can be predicted as well.

关 键 词：Bulk metallic glass Slip avalanche Plasticity Mean-field theory model Strain rate 

分 类 号：TG139.8[一般工业技术—材料科学与工程]