Sample size effects on strength and deformation mechanism of Sc75Fe25 nanoglass and metallic glass

SCRIPTA MATERIALIA

卷:116

Article

Wang, Xiaolei¹  Jiang, Feng¹  Hahn, Horst^2,5,6  Li, Ju^3,4  Gleiter, Herbert^2,5  Sun, Jun¹  Fang, Jixiang¹ 

[1] Xi An Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Mech Behav Mat, Sch Sci, Xian 710049, Peoples R China

[2] Karlsruhe Inst Technol, Inst Nanotechnol, D-76021 Karlsruhe, Germany

[3] MIT, Dept Nucl Sci & Engn, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[4] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA

[5] Nanjing Univ Sci & Technol, Herbert Gleiter Inst Nanosci, Nanjing 210094, Jiangsu, Peoples R China

[6] Tech Univ Darmstadt, Joint Res Lab Nanomat KIT TUD, D-64287 Darmstadt, Germany

关键词: Nanoglasses;    Metallic glasses;    In-situ;    Strength;    Shear band nucleation;   

DOI  :  10.1016/j.scriptamat.2016.01.036

来源: Elsevier

【 摘 要 】

The mechanical properties and deformation mechanism of Sc75Fe25 nanoglass and Sc75Fe25 metallic glass pillars with diameter from 2 gm to 95 nm were investigated by means of ex-situ and in-situ compression tests. The results showed that the yield strength and deformation mechanism in the metallic glass were size-dependent while these in the nanoglass were not. It is suggested that the reduced shear band nucleation sites in metallic glass with decreasing sample size results in the increased yield strength and transition of deformation mode. In contrast, the glass/glass interfaces in nanoglass which have reduced density could serve as shear band nucleation sites and therefore promote multiple shear banding. (C) 2016 Elsevier Ltd. All rights reserved.

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