Strong structural occupation ratio effect on mechanical properties of silicon carbide nanowires.

Abstract:

:Materials' mechanical properties highly depend on their internal structures. Designing novel structure is an effective route to improve materials' performance. One-dimensional disordered (ODD) structure is a kind of particular structure in silicon carbide (SiC), which highly affects its mechanical properties. Herein, we show that SiC nanowires (NWs) containing ODD structure (with an occupation ratio of 32.6%) exhibit ultrahigh tensile strength and elastic strain, which are up to 13.7 GPa and 12% respectively, approaching the ideal theoretical limit. The ODD structural occupation ratio effect on mechanical properties of SiC NWs has been systematically studied and a saddle shaped tendency for the strength versus occupation ratio is firstly revealed. The strength increases with the increase of the ODD occupation ratio but decreases when the occupation ratio exceeds a critical value of ~ 32.6%, micro twins appear in the ODD region when the ODD segment increases and soften the ODD segment, finally results in a decrease of the strength.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Zhang X,Wang J,Yang Z,Tang X,Yue Y

doi

10.1038/s41598-020-67652-9

subject

Has Abstract

pub_date

2020-07-09 00:00:00

pages

11386

issue

1

issn

2045-2322

pii

10.1038/s41598-020-67652-9

journal_volume

10

pub_type

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