Atomistic perspective on in situ nanomechanics. (September 2016)

• Record Type: Journal Article
• Authors: Wang, Jiangwei; Mao, Scott X.
• Is Part Of: Extreme mechanics letters. Volume 8(2016)
• Page Start: 127
• Page End: 139
• Publication Date: 2016-09
• Subjects: In situ transmission electron microscopy -- Nanomechanics -- Atomic scale -- Nanostructured materials; Mechanics -- Periodicals; Mechanics, Applied -- Periodicals; Mechanics; Electronic journals; Periodicals; 531.05
• DOI: 10.1016/j.eml.2016.02.006
• Languages: English
• ISSNs: 2352-4316

Abstract

Abstract: Nanostructured materials exhibit superior physical and mechanical properties, and they hold great promise for enabling the development of novel micro/nano electro-mechanical systems. A fundamental understanding of the mechanical deformation and degradation in nanostructured materials is critical for designing the damage-tolerant nanostructures and devices. The in situ transmission electron microscopy provides a novel approach to uncover the dynamic deformation mechanisms in nanostructured materials, especially at the atomic scale. This review presents an overview of recent progress in the atomic-scale study of mechanical properties, dynamic deformation and degradation in a variety of nanostructured materials. Experimental techniques for in situ nanomechanical testing are reviewed. New insights into the atomic-level mechanical behavior of nanostructured materials are described, including surface-mediated defect processes, size-dependent deformation mechanisms, plastic deformation of nanotwinned and nanocrystalline materials, phase transformation, liquid-like behavior and pseudoelasticity, bending and fatigue, etc. Future research on the in situ nanomechanics is also discussed. Ultimately, the in situ nanomechanics study will enable a complete understanding of the atomic-scale dynamic deformation, thereby providing a mechanistic basis of the rational design and fabrication of durable nanomaterials and nanodevices.