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.
Highlights
Materials’ mechanical properties highly depend on their internal structures
The average silicon carbide (SiC) NWs have a length of dozens of microns and with diameters ranging from several tens of nanometers to ~ 200 nm
In order to quantify the effect induced by the One-dimensional disordered (ODD) segments, in situ tensile tests of single SiC NWs with different ODD structural occupation ratios have been conducted in scanning electron microscopy (SEM)
Summary
Materials’ mechanical properties highly depend on their internal structures. Designing novel structure is an effective route to improve materials’ performance. 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. It is generally believed that materials’ mechanical properties critically depend on their internal structures at different length s cales[11,12,13]. Both experimental and simulation results show that introduction of twin boundaries, grain boundaries and other internal structures can dramatically affect the mechanical properties of one-dimensional (1-D) m aterials[14,15,16]. Effect on the mechanical properties of nanomaterials, and will be helpful for improving mechanical properties of new materials via structural design
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