Quantifying the mechanical effects of He, W and He + W ion irradiation on tungsten with spherical nanoindentation

Weaver, Jordan S.; Sun, Cheng; Wang, Yongqiang; Kalidindi, Surya R.; Doerner, R.; Mara, Nathan A.; Pathak, Siddhartha

doi:10.1007/s10853-017-1833-8

Cited by 42 publications

(6 citation statements)

References 80 publications

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“…Building upon the research presented in 2016, as well as the advancements and protocol developments by Kalidindi and close colleagues across Drexel University of the Georgia Institute of Technology, as well as others, Weaver, and others from the same network relating Kalidindi, Pathak, and Weaver with one another, continued to extend the range of spherical nanoindentation stress vs. strain exploration and data analysis. Intriguingly, Weaver et al invoked CSM spherical nanoindentation stress-strain analysis to probe and measure the evolution of mechanical properties of He, W, and (He+W) ion-irradiated tungsten at a granular level in [31].…”

Section: Relationship Between the Proportional Mechanical Properties ...mentioning

confidence: 99%

Toward an Instrumented Strength Microprobe – Origins of the Oliver-Pharr Method and Continued Advancements in Nanoindentation: Part 2

Sousa¹,

Hay²,

Cote³

2023

Elasticity of Materials

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Numerable advancements have afforded many benefits to nanoindenter system operators since the late 20th century, such as automation of measurements, enhanced load and displacement resolutions, and indentation with in-situ capabilities. Accordingly, the present chapter details how the Oliver-Pharr method of nanoindentation testing and analysis was adopted and relied upon as a framework that brought about widespread advancements in instrumented indentation testing. The present chapter introduces an emergent and theoretically consistent approach to assessing true stress–strain curves at a micromechanical scale using a flat-punch nanoindenter tip geometry and reliance upon Hollomon power-law plasticity and constitutive parameter fitting. Finally, a novel flat-punch nanoindentation testing method and approach to plasticity parameter analysis for metallic materials using nanoindentation systems can be implemented, bringing about an instrumented strength microprobe – a long sought-after tool.

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Section: Relationship Between the Proportional Mechanical Properties ...mentioning

confidence: 99%

Toward an Instrumented Strength Microprobe – Origins of the Oliver-Pharr Method and Continued Advancements in Nanoindentation: Part 2

Sousa¹,

Hay²,

Cote³

2023

Elasticity of Materials

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“…For irradiated materials, spherical indentation is widely preferred over berkovich indentation as it can analyze the irradiation effect not only on materials yielding but also the elasto-plastic transition and strain hardening behavior, by converting the force-depth (F h) relationships into the indentation stress-strain (ISS) relationships [47,48]. High temperature nanoindentation can be used to determine the thermo-mechanical behavior of irradiated materials at the actual working temperature [49].…”

Section: Nanoindentation For Nuclear Materialsmentioning

confidence: 99%

Comparative Analysis Carried Out on Modern Indentation Techniques for the Measurement of Mechanical Properties: A Review

Rouf¹,

Altaf²,

Malik³

et al. 2021

Post-Transition Metals

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Nowadays many indentation techniques are being commonly employed for determining some mechanical properties (harness, elastic modulus, toughness, etc.) using simple method of measuring the indentation depth. On the basis of measurement of depth of penetration, indentation technique has be classified into major categories i.e. microindentation and nanoindentation. Nanoindentation technique uses indirect method of determining the contact area as the depth of penetration is measured in nanometers, while in conventional indentation the area in contact is measured by elementary measurement of the residual area after the indenter is removed from the specimen. Dynamic hardness is the best result of dynamic indentation which can be expressed as the ratio of energy consumed during a rapid indentation to the volume of indentation. The parameter which are taken into consideration are indentation depth, contact force, contact area, mean contact pressure.

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“…where m is between 2 to 3, depending on the protocols used to define the ISS response and the anisotropy of the material studied [9,[63][64][65][66]. This factor is mainly to account for the lateral constraint of materials in the ISS response, which is absent in the USS response.…”

Section: Indentation Stress-strain Curvesmentioning

confidence: 99%

“…Nanoindentation has proved to be invaluable for providing mechanical information of ionirradiation damaged materials as it can extract mechanical information from the thin irradiated layers [9][10][11][12][13][14]. It has been used to investigate mechanical properties including yield strengths, deformation behaviour and elastic properties [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Deformation Behaviour of Ion-Irradiated FeCr: A Nanoindentation Study

Song,

Yu,

Karamched

et al. 2021

Preprint

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Understanding the mechanisms of plasticity in structural steels is essential for the operation of next-generation fusion reactors. Elemental composition, particularly the amount of Cr present, and irradiation can have separate and synergistic effects on the mechanical properties of ferritic/martensitic steels. The study of ion-irradiated FeCr alloys is useful for gaining a mechanistic understanding of irradiation damage in steels. Previous studies of ion-irradiated FeCr did not clearly distinguish between the nucleation of dislocations to initiate plasticity, and their propagation through the material as plasticity progresses.In this study, Fe3Cr, Fe5Cr, and Fe10Cr were irradiated with 20 MeV Fe 3+ ions at room temperature to nominal doses of 0.01 dpa and 0.1 dpa. Nanoindentation was carried out with Berkovich and spherical indenter tips to study the nucleation of dislocations and their subsequent propagation. The presence of irradiation-induced defects reduced the theoretical shear stress and barrier for dislocation nucleation. The presence of Cr further enhanced this effect due to increased retention of irradiation defects. However, this combined effect is still small compared to dislocation nucleation from pre-existing sources such as Frank-Read sources and grain boundaries. The yield strength, an indicator of dislocation mobility, of FeCr increased with irradiation damage and Cr. The increased retention of irradiation defects due to the presence of Cr also further increased the yield strength. Reduced work hardening capacity was also observed following irradiation. The synergistic effects of Cr and irradiation damage in FeCr appear to be more important for the propagation of dislocations, rather than their nucleation.

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Quantifying the mechanical effects of He, W and He + W ion irradiation on tungsten with spherical nanoindentation

Cited by 42 publications

References 80 publications

Toward an Instrumented Strength Microprobe – Origins of the Oliver-Pharr Method and Continued Advancements in Nanoindentation: Part 2

Toward an Instrumented Strength Microprobe – Origins of the Oliver-Pharr Method and Continued Advancements in Nanoindentation: Part 2

Comparative Analysis Carried Out on Modern Indentation Techniques for the Measurement of Mechanical Properties: A Review

Deformation Behaviour of Ion-Irradiated FeCr: A Nanoindentation Study

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