An investigation of the mechanical behaviors of micro-sized tungsten whiskers using nanoindentation

Li, Guangyu; Song, Min; Liu, Xinli; Ni, Song; Wang, Shiliang; He, Yuehui; Liu, Yong

doi:10.1016/j.msea.2013.11.084

Cited by 17 publications

(5 citation statements)

References 40 publications

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“…The elastic indentation mechanics theory predicts a nonlinear loaddisplacement relation 36 , while the plasticity events (e.g., the successive discrete displacement excursions, indicated by the pop-ins or displacement bursts) interrupt the nonlinear elastic solution and may explain the linear-like load-displacement relation in the Same-Reload test. Similar linear loading curves were widely observed in single-crystalline nanoindentation tests in metals and small molecules [37][38][39][40][41] .…”

Section: Mechanical Response Of Benzene Microcrystal Under In Situ Co...supporting

confidence: 81%

Deformation characteristics of solid-state benzene as a step towards understanding planetary geology

Zhang

Edwards

et al. 2022

Nat Commun

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Small organic molecules, like ethane and benzene, are ubiquitous in the atmosphere and surface of Saturn’s largest moon Titan, forming plains, dunes, canyons, and other surface features. Understanding Titan’s dynamic geology and designing future landing missions requires sufficient knowledge of the mechanical characteristics of these solid-state organic minerals, which is currently lacking. To understand the deformation and mechanical properties of a representative solid organic material at space-relevant temperatures, we freeze liquid micro-droplets of benzene to form ~10 μm-tall single-crystalline pyramids and uniaxially compress them in situ. These micromechanical experiments reveal contact pressures decaying from ~2 to ~0.5 GPa after ~1 μm-reduction in pyramid height. The deformation occurs via a series of stochastic (~5-30 nm) displacement bursts, corresponding to densification and stiffening of the compressed material during cyclic loading to progressively higher loads. Molecular dynamics simulations reveal predominantly plastic deformation and densified region formation by the re-orientation and interplanar shear of benzene rings, providing a two-step stiffening mechanism. This work demonstrates the feasibility of in-situ cryogenic nanomechanical characterization of solid organics as a pathway to gain insights into the geophysics of planetary bodies.

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Section: Mechanical Response Of Benzene Microcrystal Under In Situ Co...supporting

confidence: 81%

Deformation characteristics of solid-state benzene as a step towards understanding planetary geology

Zhang

Edwards

et al. 2022

Nat Commun

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“…mechanical behavior (I, II, and III). This is also characteristic of plasticity of other BCC metals like Mo or Nb [13][14][15][16][17].…”

mentioning

confidence: 79%

Introductory Chapter: Growing W Single Crystals by EBFZM for Studying Mechanical Behavior

Glebovsky¹

2019

Crystal Growth

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“…It has been proposed that the pop-in width can be related to the number, mobility, and interactions between dislocations during pop-in [ 52 , 53 , 54 , 55 , 56 ]. Recently, this procedure was modeled [ 40 ] using the energy balance criteria and the analysis for the current work has been presented in Section 3.3 .…”

Section: Discussionmentioning

confidence: 99%

An In-Situ Electrochemical Nanoindentation (ECNI) Study on the Effect of Hydrogen on the Mechanical Properties of 316L Austenitic Stainless Steel

et al. 2021

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In-situ electrochemical nanoindentation (ECNI) has been used to study the effect of hydrogen on the mechanical properties of austenitic stainless steel AISI 316L. Changing the electrode potential (via electrochemical charging) revealed the interconnected nature of the hydrogen effect on the nanomechanical properties of the stainless steel. At more positive cathodic potentials, a softening effect of hydrogen can be noticed, while significant hardening can be observed at more negative cathodic potentials. The hydrogen effects on the nanomechanical properties were analyzed in terms of the homogeneous dislocation nucleation (HDN) and the hydrogen-dislocation interactions from the energy point of view. The effects can be explained with the framework of the defactant theory and the hydrogen-enhanced localized plasticity (HELP) mechanism.

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An investigation of the mechanical behaviors of micro-sized tungsten whiskers using nanoindentation

Cited by 17 publications

References 40 publications

Deformation characteristics of solid-state benzene as a step towards understanding planetary geology

Deformation characteristics of solid-state benzene as a step towards understanding planetary geology

Introductory Chapter: Growing W Single Crystals by EBFZM for Studying Mechanical Behavior

An In-Situ Electrochemical Nanoindentation (ECNI) Study on the Effect of Hydrogen on the Mechanical Properties of 316L Austenitic Stainless Steel

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