期刊
NANO LETTERS
卷 16, 期 1, 页码 105-113出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b03070
关键词
Brittle-to-ductile transition; silica glass; in situ transmission electron microscopy; glass surface; plasticity
类别
资金
- NSF through University of Pittsburgh [1536811]
- U.S. Department of Energy [DE-AC04-94AL85000]
- NSF [DMR-1410636, DMR-1120901]
- German research foundation (DFG) [SPP 1594]
Silica (SiO2) glass, an essential material in human civilization, possesses excellent formability near its glass-transition temperature (T-g > 1100 degrees C). However, bulk SiO2 glass is very brittle at room temperature. Here we show a surprising brittle-to-ductile transition of SiO2 glass nanofibers at room temperature as its diameter reduces below 18 nm, accompanied by ultrahigh fracture strength. Large tensile plastic elongation up to 18% can be achieved at low strain rate. The unexpected ductility is due to a free surface affected zone in the nanofibers, with enhanced ionic mobility compared to the bulk that improves ductility by producing more bond-switching events per irreversible bond loss under tensile stress. Our discovery is fundamentally important for understanding the damage tolerance of small-scale amorphous structures.
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