Nanohardness of molybdenum in the vicinity of grain boundaries and triple junctions

Eliash, T.; Kazakevich, M.; Семенов, В. Н.; Rabkin, Eugen

doi:10.1016/j.actamat.2008.07.036

Cited by 67 publications

(38 citation statements)

References 26 publications

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“…Pathak et al [33] have reported such elastic/ plastic stress-strain results obtained on aluminum and tungsten materials and Zhu et al [34] have done so for sapphire, In 0.53 Ga 0.47 As, InP, and GaSb materials. Further interesting applications have been made recently to evaluation of local grain boundary hardness determinations relating to Hall-Petch grain boundary obstacle model considerations for iron [35] and for molybdenum [36].…”

Section: Discussionmentioning

confidence: 99%

Macro- to Nano-indentation Hardness Stress–Strain Aspects of Crystal Elastic/Plastic/Cracking Behaviors

Armstrong

Elban

2009

Exp Mech

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Single crystal KCl and MgO indentation hardness test results spanning macroscopic, microstructural, and nanoscale measurements are brought together in a ballindenter-based stress-strain description. For a significant range of hardness measurements made on MgO (001) crystal surfaces, increasingly greater plastic flow stresses are determined at smaller loads applied to smaller effective ball sizes at the rounded tips of Berkovich indenters; and, at the smallest ball diameters of 3,200 nm and 400 nm, the plastic flow stresses are shown to approach the predicted Hertzian elastic loading stresses. The resultant hardness stress-strain description, that is extended to cover the elastic, plastic, and cracking behaviors of MgO crystals, is usefully applied also to a comparison of indentation test results reported for NaCl and RDX crystals. In general, the dislocation-induced cracking stress measurements are shown for MgO and RDX crystals to be lower than cracking stresses evaluated on an (elastic) indentation fracture mechanics (IFM) basis. Comparison is made with metal nanoindentation hardness test results.

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Section: Discussionmentioning

confidence: 99%

Macro- to Nano-indentation Hardness Stress–Strain Aspects of Crystal Elastic/Plastic/Cracking Behaviors

Armstrong

Elban

2009

Exp Mech

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“…Micro-hardness experiments indicate that segregation of solute atoms at the GBs results in either hardened or softened regions compared to the interior of the adjacent grains [11,12]. Nanoindentation has detected a significant increase in the intrinsic hardness of the material near the GBs due to dislocation pinning [13][14][15][16][17][18]. In situ nanoindentation measurements during electrochemical exposures of metals at cathodic potentials revealed near-surface softening due to absorbed hydrogen [19,20].…”

Section: Introductionmentioning

confidence: 99%

Nanoindentation study of corrosion-induced grain boundary degradation in a pipeline steel

Yavas

Mishra

Alshehri

et al. 2018

Electrochemistry Communications

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High-strength low-alloy steels used for oil and gas pipelines are vulnerable to intergranular stress corrosion cracking in moderately alkaline soils. The mechanism of corrosion-induced embrittlement under such conditions is not yet understood. Nanoindentation was used to detect localized degradation of mechanical properties near internal grain boundaries of X-70 steel undergoing intergranular corrosion at active dissolution potentials at pH 8.2. The measurements identified a one-micron thick mechanically-degraded layer with 25% reduced hardness near corroded grain boundaries. It is suggested that the corrosion process may introduce an active softening agent, possibly non-equilibrium lattice vacancies generated by oxidation. KeywordsIntergranular corrosion, Dissolution-induced degradation, Stress corrosion cracking, Grain boundary softening, Nanoindentation Disciplines Aerodynamics and Fluid Mechanics | Aerospace Engineering | Nanoscience and Nanotechnology | Structures and Materials CommentsThis is a manuscript of an article published as Yavas, Denizhan, Pratyush Mishra, Abdullah Alshehri, Pranav Shrotriya, Kurt R. Hebert, and Ashraf F. Bastawros. "Nanoindentation study of corrosion-induced grain boundary degradation in a pipeline steel." Electrochemistry Communications 88 (2018) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D MA N U S C R I P T AbstractHigh-strength low-alloy steels used for oil and gas pipelines are vulnerable to intergranular stress corrosion cracking in moderately alkaline soils. The mechanism of corrosion-induced embrittlement under such conditions is not yet understood. Nanoindentation was used to detect localized degradation of mechanical properties near internal grain boundaries of X-70 steel undergoing intergranular corrosion at active dissolution potentials at pH 8.2. The measurements identified a one-micron thick mechanicallydegraded layer with 25% reduced hardness near corroded grain boundaries. It is suggested that the corrosion process may introduce an active softening agent, possibly non-equilibrium lattice vacancies generated by oxidation.

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“…The increasing trend of the normalized forming depth with the decreasing N value is similar to the quasi-static condition, which is consistent with the Hall-Petch relationship. It is also found that the hardness of the grain boundary region is 30% higher than that of the grain interior region (Eliash et al, 2008). When the thickness remains constant, the volume fraction of grain boundary decreases with the increase of grain size.…”

Section: Grain Size Effect On the Normalized Forming Depthmentioning

confidence: 95%

Size effects on formability in microscale laser dynamic forming of copper foil

Wang

Shen

et al. 2015

Journal of Materials Processing Technology

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Nanohardness of molybdenum in the vicinity of grain boundaries and triple junctions

Cited by 67 publications

References 26 publications

Macro- to Nano-indentation Hardness Stress–Strain Aspects of Crystal Elastic/Plastic/Cracking Behaviors

Macro- to Nano-indentation Hardness Stress–Strain Aspects of Crystal Elastic/Plastic/Cracking Behaviors

Nanoindentation study of corrosion-induced grain boundary degradation in a pipeline steel

Size effects on formability in microscale laser dynamic forming of copper foil

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