Superelongation and Atomic Chain Formation in Nanosized Metallic Glass

被引：83

作者：

Luo, J. H. ^{[1
]}

Wu, F. F. ^{[2
]}

Huang, J. Y. ^{[3
]}

Wang, J. Q. ^{[4
]}

Mao, S. X. ^{[1
]}

机构：

[1] Univ Pittsburgh, Dept Mech Engn & Mat Sci, Pittsburgh, PA 15261 USA

[2] Liaoning Univ Technol, Sch Mat Sci & Engn, Jinzhou 121001, Peoples R China

[3] Sandia Natl Labs, Ctr Integrated Nanotechnol, Albuquerque, NM 87185 USA

[4] Inst Met Sci & Technol, Shenyang 110016, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 21期

基金：

中国国家自然科学基金; 美国国家科学基金会;

关键词：

MECHANICAL-PROPERTIES; AMORPHOUS-ALLOYS; FRACTURE MECHANISMS; MATRIX COMPOSITES; TENSILE DUCTILITY; DAMAGE; DEFORMATION;

D O I：

10.1103/PhysRevLett.104.215503

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Bulk metallic glasses are brittle and fail with no plastic strain at room temperature once shear bands propagate. How do metallic glasses deform when the size is less than that of shear bands? Here we show that Al(90)Fe(5)Ce(5) metallic glass with a size <20 nm can be extremely elongated to similar to 200%. Remarkably, even an atomic chain was formed after sample necking, which was never observed in metallic glasses. The unexpected ductility may originate from the fast surface diffusion and the absence of shear band formation, and may guide the development of ductile metallic glasses for engineering applications.

引用

页数：4

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