Indentation size effect, geometrically necessary dislocations and pile-up effects in hardness testing of irradiated nickel

Mattucci, Mitchell; Cherubin, Igor J.S.; Changizian, P.; Skippon, Travis; Daymond, Mark R.

doi:10.1016/j.actamat.2021.116702

Cited by 65 publications

(18 citation statements)

References 33 publications

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“…A continuous increase of hardness and decrease of elastic modulus occurred as the penetration depth increases. This could be due to an indentation size effect whereby the measured hardness increases with increasing indentation load [25]. The effect has been attributed to a variety of contributions including the elastic recovery of the indentation, surface dislocation pinning, dislocation nucleation, deformation band spacing, surface energy of the test specimen, and statistical measurement errors.…”

Section: Resultsmentioning

confidence: 99%

A Comparative Investigation on Mechanical Properties of Tib<sub>2</sub>/Cr Multilayer Film by Indentation

Chen¹,

Wu²,

Wang³

2022

Preprint

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Alternating TiB2-dcMS and Cr-HiPIMS layers are used to fabricate TiB2/Cr multilayer films. In-troducing a 5-nm-thick Cr interlayer deposited under a substrate bias of -60 V produces slight increases of both film hardness and elastic modulus. The TEM observation indicates that the Cr grains favor epitaxially growth on TiB2 interlayer, forming a coherent TiB2/Cr interface. This produces the hardness increasement. Mechanic measurement by using AFM illustrates that the coherent interface increases the elastic modulus of the Cr up to ~280 GPa, which is significantly higher than bulk material.

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Section: Resultsmentioning

confidence: 99%

A Comparative Investigation on Mechanical Properties of Tib<sub>2</sub>/Cr Multilayer Film by Indentation

Chen¹,

Wu²,

Wang³

2022

Preprint

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“…The dislocation walls determined the plastic deformation in ultra-high-pressure sintering and strengthened the as-sintered ZrC by inhibiting dislocation slip. [28][29][30] Dislocation walls might have linked together to form subgrains. [31][32][33] This result could be associated with the misorientation results of EBSD.…”

Section: Resultsmentioning

confidence: 99%

Full densification of zirconium carbide ceramics sintered under high pressure at low temperature

Zou

et al. 2021

Int J Applied Ceramic Tech

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Zirconium carbide (ZrC) ceramic is one of the most important and promising materials with a high melting point. However, its low diffusion coefficient affects its densification behavior, which dramatically limits its engineering application. For polycrystal ceramic materials, sintering by thermal diffusion is the most widely used method for consolidation. But in view of the difficult densification behavior of ZrC, it is necessary to develop new sintering methods together with another driving force. In the study, we reported an ultra-high-pressure sintering strategy to fully densify ZrC ceramic under 1.7 GPa at 1600°C. The sintered sample exhibited high density, fine grain size, excellent mechanical properties, and a large number of crystal defects, including dislocation networks and walls, which were similar to those in deformed metals. Its hardness increased to 2057.44 HV0.1 because of its unique microstructure.

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“…11d) and a crystal orientation close to [110] where the obtained GND density agrees well with the Ma-Clarke's fitting. Due to the fact, that the plastic area around the indent is proportional to the ten times of the indentation depth 13 the GNDs analysis was provided from the larger area (compare the zones marked with red circles in Fig. 11d).…”

Section: A Nanoindentation Experiments and Molecular Simulationsmentioning

confidence: 99%

“…It is well known that plasticity properties and physical mechanisms associated with the deformation of a material can be estimated from nanoindentation data 2,[9][10][11][12] where hardness and flow stress are well explained in the literature [13][14][15][16][17] . Hardness is defined as the ability of a material to resist plastic deformation.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of strength and hardening in austenitic stainless 310S steel: Nanoindentation experiments and multiscale modeling

Domínguez-Gutiérrez¹,

Mulewska²,

Ustrzycka³

et al. 2022

Preprint

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Austenitic stainless steels with low carbon have exceptional mechanical properties and are capable to reduce embrittlement, due to high chromium and nickel alloying, thus they are very attractive for efficient energy production in extreme environments. It is key to perform nanomechanical investigations of the role of chromium and the form of the particular alloy composition that give rise to the excellent mechanical properties of steel. We perform nanoindentation experiments and molecular dynamics (MD) simulations of FCC austenitic stainless steel 310S, using established interatomic potentials, and we use a comparison to the plastic behavior of NiFe solid solutions under similar conditions for the elucidation of key dislocation mechanisms. We combine EBSD images to connect crystalline orientations to nanoindentation results, and provide input data to MD simulations for modeling mechanisms of defects nucleation and interactions. The maps of impressions after nanoindentation indicate that the Ni-Fe-Cr composition in 310S steel leads to strain localization and hardening. A detailed analysis of the dislocation dynamics at different depths leads to the development of an experimentally consistent Kocks-Mecking-based continuum multiscale model. Furthermore, the analysis of geometrically necessary dislocations (GND) shows to be responsible for exceptional hardness at low depths, predicted by the Ma-Clarke's constitutive model.

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Indentation size effect, geometrically necessary dislocations and pile-up effects in hardness testing of irradiated nickel

Cited by 65 publications

References 33 publications

A Comparative Investigation on Mechanical Properties of Tib<sub>2</sub>/Cr Multilayer Film by Indentation

A Comparative Investigation on Mechanical Properties of Tib<sub>2</sub>/Cr Multilayer Film by Indentation

Full densification of zirconium carbide ceramics sintered under high pressure at low temperature

Mechanisms of strength and hardening in austenitic stainless 310S steel: Nanoindentation experiments and multiscale modeling

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