Control of shear band dynamics in Cu50Zr50 metallic glass by introducing amorphous-crystalline interfaces

JOURNAL OF ALLOYS AND COMPOUNDS

卷:770

Article

Feng, S. D.^1,2  Li, L.³  Chan, K. C.²  Qi, L.^1,4  Zhao, L.²  Wang, L. M.¹  Liu, R. P.¹ 

[1] Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Peoples R China

[2] Hong Kong Polytech Univ, Dept Ind & Syst Engn, Adv Mfg Technol Res Ctr, Hong Kong 999077, Hong Kong, Peoples R China

[3] Univ Alabama, Dept Met & Mat Engn, Tuscaloosa, AL 35487 USA

[4] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

关键词: Metallic glass;    Shear band;    Interface;    Molecular dynamics simulation;   

DOI  :  10.1016/j.jallcom.2018.08.192

来源: Elsevier

【 摘 要 】

The effects of interfaces in crystalline Cu/amorphous Cu50Zr50 on shear banding dynamics are investigated using molecular dynamics simulations. The results show that the introduction of amorphous-crystalline interfaces can effectively promote the homogeneous distribution of shear transformation zones (STZ5). We found that the high potential energy combined with the defects of the interfaces promote the nucleation of STZs. Further, the amorphous-crystalline interfaces are transition regions that mediate the transmission of dislocations in the crystallites into STZ5 in the metallic glasses. The accumulation of STZ5 and dislocations at the interfaces provide the sources for the enhanced plastic deformation in nanocomposites. These results allow us to determine the fundamental atomic structure of amorphous-crystalline interfaces in nanocomposites. (C) 2018 Elsevier B.V. All rights reserved.

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