In situ monitoring of dislocation proliferation during plastic deformation using ultrasound

Salinas, Vicente; Aguilar, C.; Espinoza-González, Rodrigo; Lund, Fernando; Mujica, Nicolás

doi:10.1016/j.ijplas.2017.06.001

Cited by 28 publications

(16 citation statements)

References 53 publications

(10 reference statements)

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“…Figure 1 shows an example of XRD pattern for an aluminum and copper sample. As in recent works [18], there is not one crystallite size, but rather a distribution of sizes that contribute to each diffraction peak, each one having an associated microstrain. Using the information about the volume fraction of each phase provided by MAUD, the results for Λ were calculated as a weighted average of results for differents crystallite sizes.…”

Section: Methodsmentioning

confidence: 90%

“…XRD measurements were carried out with the same procedure and equipment reported by Salinas et al [18] Microstructural parameters such as lattice parameter a and microstrain 2 1/2 , were obtained from Rietveld refinements of the X-ray patterns with the Materials Analysis Using Diffraction (MAUD) software and LaB 6 (a = 4.1565915(1) Å) as external standard for the determination of instrumental broadening. Using the information provided by MAUD, it is possible to obtain a measurement of dislocation density Λ XRD for each Al and Cu sample through…”

Section: Methodsmentioning

confidence: 99%

“…Resonant Ultrasound Spectroscopy (RUS) [16] by Mujica et al [17]. In addition, Salinas et al [18] measured nL 3 in-situ and continuously as a function of applied stress for aluminum under standard testing conditions. These measurements provided and experimental verification of Taylor's rule with unprecedented accuracy [18].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, Salinas et al [18] measured nL 3 in-situ and continuously as a function of applied stress for aluminum under standard testing conditions. These measurements provided and experimental verification of Taylor's rule with unprecedented accuracy [18]. They provide a solid basis to use velocity measurements as a nonintrusive quantitative measure, as opposed to qualitative estimate, changes in dislocation density.…”

Section: Introductionmentioning

confidence: 99%

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Linear Versus Nonlinear Acoustic Probing of Plasticity in Metals: A Quantitative Assessment

Espinoza

Feliú

Aguilar

et al. 2018

Preprint

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The relative dislocation density of aluminum and copper samples is quantitatively measured using linear Resonant Ultrasound Spectroscopy (RUS). For each metallic group, four samples were prepared with different thermomechanical treatments in order to induce changes in their dislocation densities. The RUS results are compared with Nonlinear Resonant Ultrasound Spectroscopy (NRUS) as well as Second Harmonic Generation (SHG) measurements. NRUS has a higher sensitivity by a factor of two to six and SHG by 14% to 62%. The latter technique is, however, faster and simpler. As main a result we obtain a quantitative relation between the changes in the nonlinear parameters and the dislocation density variations, which in a first approximation is a linear relation between these differences. We also present a simple theoretical expression that explains the better sensitivity to dislocation content of the nonlinear parameters with respect to the linear ones. X-Ray diffraction measurements, although intrusive and less accurate, support the acoustics results.

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Section: Methodsmentioning

confidence: 90%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Linear Versus Nonlinear Acoustic Probing of Plasticity in Metals: A Quantitative Assessment

Espinoza

Feliú

Aguilar

et al. 2018

Preprint

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“…Use of the formalism developed therein, together with multiple scattering theory, has enabled the computation of an effective, complex, index of refraction for the propagation of coherent elastic waves in a medium filled with randomly distributed and oriented, pinned dislocation segments 21,22 . In turn, this has led to novel characterization tools to describe the plasticity of metals and alloys [23][24][25] .…”

Section: Introductionmentioning

confidence: 99%

Scattering of phonons by quantum-dislocation segments in an elastic continuum

Lund

Scheihing-Hitschfeld

2019

Phys. Rev. B

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A canonical quantization procedure is applied to elastic waves interacting with pinned dislocation segments ("strings") of length L via the Peach-Koehler force. The interaction Hamiltonian, derived from an action principle that classically generates the Peach-Koehler force, is a power series of creation and annihilation operators. The leading term is quadratic, and keeping only this term the observable quantities of scattering processes are computed to all orders in perturbation theory. The resulting theory is characterized by the magnitude of kL, with k the wavenumber of an incident phonon. The theory is solved for arbitrary kL, and different limits are explored. A significant result at this level is the scattering cross section for phonons by dislocation segments. As a function of frequency, this cross section has a much richer structure than the linear-in-frequency behavior that is inferred from scattering by an infinite, static, dislocation. The rate of spontaneous phonon emission by an excited dislocation is computed as well. When many dislocations are present, an effective mass operator is computed in the Weak and Independent Scattering Approximation. The contribution of the cubic terms is computed to leading order in perturbation theory. They allow for a comparison of the scattering of a phonon by a string and the three-phonon scattering, as well as studying the dependence of scattering amplitudes on the temperature of the solid. It is concluded that the effect of dislocations will dominate for relatively modest dislocation densities. Finally, the full power series of the interaction Hamiltonian is considered. The effects of quantum corrections, i.e., contributions proportional to Planck's constant, are estimated, and found to be controlled by another wavenumber-dependent parameter kdq, where dq is a length proportional to √ . The possibility of using the results of this paper in the study of the phononic thermal properties of two-and three-dimensional materials is noted and discussed.

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Study on Plastic Deformation Removal Mechanism and Dislocation Change in Nanogrinding of Single Crystal Silicon Carbide with Random Rough Surface

Yu,

Shen,

Chen

et al. 2024

Physica Status Solidi (a)

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This investigation centers on exploring the plastic deformation removal mechanism and dislocation dynamics in the nano‐grinding of single crystal silicon carbide featuring a randomly rough surface. To simulate this, a novel approach combining the Weierstrass‐Mandelbrot fractal surface function with molecular dynamics is employed. Generate randomly rough surface contours using the Weierstrass‐Mandelbrot fractal surface function. By adjusting the fractal dimension, an ideal representation of single crystal silicon carbide with randomly rough surfaces is obtained. By combining plastic deformation detection methods, the process of workpiece sliding, plowing, and chip removal is thoroughly studied, and the plastic deformation removal mechanism of random rough surface grinding is explored; Combining post‐processing methods such as sheer strain and dislocation trajectory, analyze the morphological changes and transformation mechanisms of dislocations. Notably, at a grinding depth of 33.18nm, the activation of slip systems induces dislocation formation, enabling plastic deformation. Furthermore, at depths exceeding 144.00nm, the emergence of stacking faults on the random rough surface is observed. Throughout the grinding procedure, plastic deformation of debris occurs, leading to the formation of plastic bulges on both sides of the tool, the debris generated during processing does not significantly impact the defects encountered during secondary grinding of the rough surface.This article is protected by copyright. All rights reserved.

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In situ monitoring of dislocation proliferation during plastic deformation using ultrasound

Cited by 28 publications

References 53 publications

Linear Versus Nonlinear Acoustic Probing of Plasticity in Metals: A Quantitative Assessment

Linear Versus Nonlinear Acoustic Probing of Plasticity in Metals: A Quantitative Assessment

Scattering of phonons by quantum-dislocation segments in an elastic continuum

Study on Plastic Deformation Removal Mechanism and Dislocation Change in Nanogrinding of Single Crystal Silicon Carbide with Random Rough Surface

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