In-situ tensile testing of nano-scale specimens in SEM and TEM

Haque, M. Shamsul; Saif, M. Taher A.

doi:10.1007/bf02411059

Cited by 236 publications

(93 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[23][24][25][26][27][28][29] The micro-electromechanical system (MEMS) is another important approach for the in situ microscopy mechanics by TEM. 8,30 These devices are based on Si technology, and film deposition, lithography and etching techniques are used to design actuators and force sensors on a chip. One of the first successful MEMS devices for in situ TEM deformation studies of metallic lines was developed by Saif's group.…”

Section: Experimental Techniques By In Situ Microscopymentioning

confidence: 99%

In situ experimental mechanics of nanomaterials at the atomic scale

2013

View full text Add to dashboard Cite

Sub-micron and nanostructured materials exhibit high strength, ultra-large elasticity and unusual plastic deformation behaviors. These properties are important for their applications as building blocks for the fabrication of nano-and micro-devices as well as for their use as components for composite materials, high-strength structural and novel functional materials. These nano-related deformation and mechanical behaviors, which are derived from possible size and dimensional effects and the low density of defects, are considerably different from their conventional bulk counterparts. The atomic-scale understanding of the microstructural evolution process of nanomaterials when they are subjected to external stress is crucial for understanding these 'unusual' phenomena and is important for designing new materials, novel structures and applications. This review presents the recent developments in the methods, techniques, instrumentation and scientific progress for atomic-scale in situ deformation dynamics on nanomaterials, including nanowires, nanotubes, nanocrystals, nanofilms and polycrystalline nanomaterials. The unusual dislocation initiation, partial-full dislocation transition, crystalline-amorphous transitions and fracture phenomena related to the experimental mechanics of the nanomaterials are reviewed. Current limitations and future aspects using in situ high-resolution transmission electron microscopy of nanomaterials are also discussed. A new research field of in situ experimental mechanics at the atomic scale is thus expected. Keywords: atomic scale; dislocation; experimental mechanics; in situ; nanomaterial; twin INTRODUCTION Recent studies on nanostructured materials, including nanowires (NWs), 1,2 nanotubes (NTs), 1,3 nanocrystals (NC), 4 micro/nanopillars (NPs) 5-7 and nanocrystalline, 8,9 have revealed a variety of 'unusual deformation' phenomena compared with their bulk counterparts, such as high strength, nano-piezoelectric effects and unusual plastic deformation behaviors. Nanostructured materials can apparently sustain a larger dynamic range of elastic and plastic strains than conventional materials. The results from these studies indicate that the fundamental dislocation processes that initiate and sustain plastic flow and fracture in nanoscale materials are considerably different than in their conventional bulk counterparts. These 'unusual' phenomena not only allow these materials to possess excellent mechanical properties but also enable the tuning of their band structures and related novel electronic, magnetic, optical, photonic and catalytic properties. Revealing the atomic-scale deformation mechanisms of nanomaterials (NM) and controlling their elastic and plastic properties are useful for realizing the desired mechanical, physical and chemical properties through the application of stress or strain.Although extensive studies have been conducted to investigate the mechanical properties of NM, 10 the majority of the atomic

show abstract

Section: Experimental Techniques By In Situ Microscopymentioning

confidence: 99%

In situ experimental mechanics of nanomaterials at the atomic scale

2013

View full text Add to dashboard Cite

show abstract

“…They are generally measured by tensile testing of either free-standing thin films without substrates [6][7][8][9] or supported thin films on compliant substrates [10][11][12] . The freestanding tensile test is able to measure the mechanical properties of thin films directly without cumbersome calculation from substrate effects.…”

mentioning

confidence: 99%

“…The freestanding tensile test is able to measure the mechanical properties of thin films directly without cumbersome calculation from substrate effects. Nevertheless, the free-standing tensile test has disadvantages, in particular with fabricating and handling of freestanding thin-film specimens without damage, resulting from difficulties in separating the specimen from the substrate, and subsequent manipulation without forming wrinkles and cracks 8 . In contrast, the supported thin-film tensile test is also widely used as an alternative method, owing to advantages of convenient specimen fabrication and handling, by utilizing an underlying compliant substrate.…”

mentioning

confidence: 99%

Tensile testing of ultra-thin films on water surface

et al. 2013

View full text Add to dashboard Cite

The surface of water provides an excellent environment for gliding movement, in both nature and modern technology, from surface living animals such as the water strider, to LangmuirBlodgett films. The high surface tension of water keeps the contacting objects afloat, and its low viscosity enables almost frictionless sliding on the surface. Here we utilize the water surface as a nearly ideal underlying support for free-standing ultra-thin films and develop a novel tensile testing method for the precise measurement of mechanical properties of the films. In this method, namely, the pseudo free-standing tensile test, all specimen preparation and testing procedures are performed on the water surface, resulting in easy handling and almost frictionless sliding without specimen damage or substrate effects. We further utilize van der Waals adhesion for the damage-free gripping of an ultra-thin film specimen. Our approach can potentially be used to explore the mechanical properties of emerging twodimensional materials.

show abstract

“…Although tensile testing is popular for evaluation of mechanical properties, it is difficult to apply it to nano-component because it requires precise alignment and reliable gripping (Haque & Saif, 2002;Huang & Spaepen, 2000;Tsuchiya et al, 1998). Especially, bending (Motz et al, 2005;Namazu et al, 2000) and compression (Dimiduk et al, 2005 ;Moser & Wasmer, 2007) methods are often adopted.…”

Section: Specimen Gripping and Alignmentmentioning

confidence: 99%