Overview on micro- and nanomechanical testing: New insights in interface plasticity and fracture at small length scales

Dehm, Gerhard; Jaya, Balila Nagamani; Raghavan, R.; Kirchlechner, Christoph

doi:10.1016/j.actamat.2017.06.019

Cited by 311 publications

(112 citation statements)

References 296 publications

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“…Further, the effect of slip plane/ growth defect intersections can be incorporated in hardening models with consideration of fracture following plasticity where accumulation of dislocations on individual planes appears likely and there is no or little confinement preventing decohesion along prismatic planes. The results presented here provide a first indication which mechanisms would be most relevant to include in a crystal plasticity model, even if individual components, such as quantitative hardening characteristics and fracture stresses, would have to be determined more accurately by further nanomechanical experiments (Dehm et al, 2018) and correlative simulations and experiments on the relevant microstructures.…”

Section: Compression Of Single Crystalline Micropillarsmentioning

confidence: 99%

Room temperature deformation in the Fe7Mo6 μ-Phase

Schröders

Sandlöbes

Birke

et al. 2018

International Journal of Plasticity

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The role of topologically close packed (TCP) phases in deformation of superalloys and steels is still not fully resolved. In particular, the intrinsic deformation mechanisms of these phases are largely unknown including the active slip systems in most of these complex crystal structures. Here, we present a first detailed investigation of the mechanical properties of the Fe7Mo6 µ-phase at room temperature using microcompression and nanoindentation with statistical EBSD-assisted slip trace analysis and TEM imaging. Slip occurs predominantly on the basal and prismatic planes, resulting also in decohesion on prismatic planes with high defect density. The correlation of the deformation structures and measured hardness reveals pronounced hardening where interaction of slip planes occurs and prevalent deformation at pre-existing defects.

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Section: Compression Of Single Crystalline Micropillarsmentioning

confidence: 99%

Room temperature deformation in the Fe7Mo6 μ-Phase

Schröders

Sandlöbes

Birke

et al. 2018

International Journal of Plasticity

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“…In parallel, the fracture and interfacial behaviour of nanomaterials and micro-device has recently established as a hot topic in the nanomechanical materials testing community [30].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Metrology and nano-mechanical tests for nano-manufacturing and nano-bio interface: Challenges & future perspectives

et al. 2018

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Nanometrology refers to measurement techniques that assess materials properties at the nanoscale. Laboratory-based characterisation of nanomaterials has been the key enabler in the growth of nanotechnology and nano-enabled products. Due to the small size involved, dimensional measurements has dominated such characterisation underpinned by a tremendous development in stand-alone electron/ion microscopes and scanning probe microscopes. However, the scope of nanometrology extends far beyond off-site, laboratory-based measurements of dimensions only, and is expected to have a tremendous impact on design of nano-enabled materials and devices. In this article, we discuss some of the available techniques for laboratory-based characterisation of mechanical and interfacial properties for nanometrology. We also provide a deep insight into the emerging techniques in measuring these properties, keeping in view the need in advanced manufacturing and nanobio-interactions to develop multifunctional instrumentation, traceable and standardized methods, and modelling tools for unambiguous data interpretation. We also discuss the evaluation of nanomechanical properties and surface/interface response of materials, within the purview of manufacturing processes and standardization. Finally, we discuss scientific and technological challenges that are required to move towards real-time nano-characterisation for rapid, reliable, repeatable and predictive metrology to underpin upscaling nanomaterials and nano-enabled products from the research field to industry and market

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“…Recent technological developments have enabled the fabrication of electronic devices with high-density integration. Small size components, e.g., at the nanometer scale, can be fabricated with different shapes including features such as notches and may have defects such as cracks [1,2]. These circumstances have brought problems commonly addressed by fracture mechanics and fatigue theory to a completely new scale level, raising several new questions, experimental challenges, but also attractive new scientific possibilities [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Brittle Failure of Nanoscale Notched Silicon Cantilevers: A Finite Fracture Mechanics Approach

Gallo

Sapora

2020

Applied Sciences

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The present paper focuses on the Finite Fracture Mechanics (FFM) approach and verifies its applicability at the nanoscale. After the presentation of the analytical frame, the approach is verified against experimental data already published in the literature related to in situ fracture tests of blunt V-notched nano-cantilevers made of single crystal silicon, and loaded under mode I. The results show that the apparent generalized stress intensity factors at failure (i.e., the apparent generalized fracture toughness) predicted by the FFM are in good agreement with those obtained experimentally, with a discrepancy varying between 0 and 5%. All the crack advancements are larger than the fracture process zone and therefore the breakdown of continuum-based linear elastic fracture mechanics is not yet reached. The method reveals to be an efficient and effective tool in assessing the brittle failure of notched components at the nanoscale.

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Overview on micro- and nanomechanical testing: New insights in interface plasticity and fracture at small length scales

Cited by 311 publications

References 296 publications

Room temperature deformation in the Fe7Mo6 μ-Phase

Room temperature deformation in the Fe7Mo6 μ-Phase

Metrology and nano-mechanical tests for nano-manufacturing and nano-bio interface: Challenges & future perspectives

Brittle Failure of Nanoscale Notched Silicon Cantilevers: A Finite Fracture Mechanics Approach

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