Dynamic observation of Al thin films plastically strained in a TEM

Legros, Marc; Dehm, Gerhard; Keller-Flaig, R.-M.; Arzt, Eduard; Hemker, Kevin J.; Suresh, S.

doi:10.1016/s0921-5093(00)01702-0

Cited by 27 publications

(13 citation statements)

References 16 publications

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“…[28,39,124,125,128]. Such stress (strain) assisted grain growth has been reported by several groups [28,39,[118][119][120][121][124][125][126][128][129][130][131][132][133][134][135][136][137][138][139] and can occur at even liquid nitrogen temperature [129,130]. These observations suggest that grain rotation play a significant role in the deformation of nc metals and alloys and it often leads to grain growth.…”

Section: Grain Rotationmentioning

confidence: 54%

Deformation twinning in nanocrystalline materials

Zhu

Liao

2012

Progress in Materials Science

1,146

447

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Section: Grain Rotationmentioning

confidence: 54%

Deformation twinning in nanocrystalline materials

Zhu

Liao

2012

Progress in Materials Science

1,146

447

View full text Add to dashboard Cite

“…This method has been used to investigate plasticity in thin films 39,40 on substrates, and it requires a conventional heating stage. The mismatch in the thermal expansion coefficients between the film and the substrate will cause the film to experience tensile or compressive stress.…”

Section: Experimental Techniques By In Situ Microscopymentioning

confidence: 99%

In situ experimental mechanics of nanomaterials at the atomic scale

2013

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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

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“…[50,[66][67][68] As a consequence of the limited dislocation-based plasticity the internal thermal stress in the film increases when geometrical (film thickness) and microstructural (grain size) dimensions decrease. This behavior can also be seen in the stress temperature evolution.…”

Section: Reviewsmentioning

confidence: 99%

Mechanical Size‐Effects in Miniaturized and Bulk Materials

et al. 2006

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Interfaces and surfaces can impose substantial mechanical size‐effects on materials. The deformation mechanisms become increasingly constrained when microstructural and/or geometrical dimensions decrease. This effect can improve, for example, the creep resistance of a bulk lamellar material, but it may cause failure for a miniaturized material component due to high internal stresses. Several dislocation mechanisms causing size‐dependent flow stresses for (sub)micron‐sized metals and metallic thin films are addressed in this paper and the current understanding of size‐effects in miniaturized and bulk materials is reviewed. The beneficial application of mechanical size‐effects is demonstrated for TiAl alloys and nanostructured hard coatings.

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Dynamic observation of Al thin films plastically strained in a TEM

Cited by 27 publications

References 16 publications

Deformation twinning in nanocrystalline materials

Deformation twinning in nanocrystalline materials

In situ experimental mechanics of nanomaterials at the atomic scale

Mechanical Size‐Effects in Miniaturized and Bulk Materials

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