Title

Nonlinear Fracture of Two-Dimensional Transition Metal Carbides (MXenes)

Abstract

As a newly discovered two-dimensional (2D) material group, MXene has exceptional thermal- electronic properties. However, its mechanical behavior, especially fracture, remains unexplored. In-situ SEM tensile experiments show that the fracture of MXene is quite nonlinear with a much-prolonged softening stage in comparison with other 2D materials, which is suspected to be caused by the anisotropy and relatively thick monolayer of MXenes. In this work, molecular dynamic (MD) modeling is conducted to investigate the anisotropic fracture behavior of two types of MXenes (Ti2C and Ti3C2) with different monolayer thickness. Both pristine and defected MXenes are investigated. Results show that: (1) MXene tends to fracture along zigzag direction, (2) atomic vacancies at the crack tip have limited effects on the overall fracture behavior, (3) a thicker monolayer can produce a larger cohesive zone due to the ‘thinning’ process, (4) complex fracture paths are to be expected for mixed-mode fractures.

Department(s)

Civil, Architectural and Environmental Engineering

Comments

This material is based upon work supported by the National Science Foundation under Grant No. MoMS 1930881.

Keywords and Phrases

Fracture behavior; Molecular dynamics modeling; MXene

International Standard Serial Number (ISSN)

0013-7944

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2020 Elsevier, All rights reserved.

Publication Date

01 May 2020

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