Ultrasonic Characterization of Co-Additives Effects on Elastic Moduli and Acoustic Properties of Li1-xCoxFe2O4

Acoustic microscopes can be used to measure Rayleigh and longitudinal wave velocities in a specimen at microscopic resolution. These velocities are deduced from the analysis of the so-called acoustic signatures or V(z) curves. Such curves are obtained by recording the output signal, V, as the specimen is defocused along the z axis of the lens. In this context, we investigate Co-Additives effects on reflectance functions, R(θ) and acoustic signatures. The elastic properties of Lithium cobalt mixed ferrites of different compositions from the experimentally and simulation observed that the values of longitudinal wave velocities vary from 5072 m/s to 6833 m/s whereas transverse velocities from 3084 m/s to 4105 m/s. The variation of the elastic moduli with composition was interpreted in terms of the binding forces between the atoms.

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Ultrasonic Characterization of the Elastic Constants in an Aging Ti-6Al-4V ELI Alloy

Volume 11: Acoustics, Vibration, and Phononics ◽

10.1115/imece2019-10194 ◽

2019 ◽

Author(s):

Hector Carreon

Keyword(s):

Elastic Properties ◽

Ultrasonic Velocity ◽

Precipitation Process ◽

Material Microstructure ◽

Clear Trend ◽

Sem Image ◽

Wave Velocities ◽

Ultrasonic Characterization ◽

Α Phase

Abstract In this paper, we report the experimental data of the elastic properties of the young and shear modulus based on the variation in the ultrasonic velocity parameter during the microstructural evolution in a Ti-6Al-4V alloy with two varying microstructures, bimodal and acicular respectively. The two different initial microstructures, were treated thermally by aging at 515°C, 545°C and 575°C at different times from 1 min to 576hr to induce a precipitation process. Ultrasonic measurements of shear and longitudinal wave velocities, scanning electron microscopy (SEM) image processing, optical microscopy (OM) and microhardness were performed, establishing a direct correlation with the measurements of the ultrasonic velocity and the elastic properties developed during the thermal treatment of the artificial aging. The results of the ultrasonic velocity show a very clear trend as the aging time progresses, which is affected by precipitation of Ti3Al particles inside the α phase. In this way, we can know, in a fast and efficient way, the elastic properties developed during the heat treatment of aging at long times, since the presence of these precipitates hardens the material microstructure affecting the final mechanical properties.

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Laser-Ultrasonic Characterization of the Microstructure of Aluminium

Materials Science Forum ◽

10.4028/www.scientific.net/msf.519-521.1373 ◽

2006 ◽

Vol 519-521 ◽

pp. 1373-1378 ◽

Cited By ~ 4

Author(s):

André Moreau

Keyword(s):

Elastic Moduli ◽

Thermomechanical Processing ◽

Laser Ultrasonics ◽

Materials Properties ◽

Ultrasonic Characterization ◽

Line Measurement ◽

Industrial Materials ◽

Physical Principles

Ultrasonic velocity and attenuation measurements are powerful tools to infer much information about the microstructure and properties of aluminum and its alloys. Laser-ultrasonics is a technology that enables doing these measurements remotely, in-situ or inline and in a fraction of a second. Therefore, it is possible to characterize the thermomechanical processing of aluminum alloys with unprecedented time resolution. This paper reviews the physical principles that allow relating velocity and attenuation measurements to various materials properties and microstructural features such as elastic moduli, crystallographic distribution orientation (texture), residual stresses, recrystallization and dislocations. In-situ (in laboratory furnaces) and in-line measurement examples from the Industrial Materials Institute research group are reviewed and presented.

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Ultrasonic Characterization of the Aortic Architecture in Marfan Patients

Circulation ◽

10.1161/01.cir.91.4.1272 ◽

1995 ◽

Vol 91 (4) ◽

pp. 1272-1274 ◽

Cited By ~ 2

Author(s):

Dianna M. Milewicz

Keyword(s):

Ultrasonic Characterization

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Spectral-based Ultrasonic Characterization of Renal Allografts in vivo

2021 Global Medical Engineering Physics Exchanges/Pan American Health Care Exchanges (GMEPE/PAHCE) ◽

10.1109/gmepe/pahce50215.2021.9434842 ◽

2021 ◽

Author(s):

E. Acosta ◽

C. Amador ◽

S. Aristizabal ◽

M. L. Montero ◽

M. W. Urban ◽

...

Keyword(s):

Renal Allografts ◽

Ultrasonic Characterization

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A physical approach to the automated ultrasonic characterization of buried weld defects in ferritic steel

NDT International ◽

10.1016/0308-9126(86)90103-3 ◽

1986 ◽

Vol 19 (3) ◽

pp. 145-153 ◽

Cited By ~ 24

Author(s):

S.F. Burch ◽

N.K. Bealing

Keyword(s):

Ferritic Steel ◽

Weld Defects ◽

Ultrasonic Characterization ◽

Physical Approach

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Acoustic Characterization of Some Steel Industry Waste Materials

Applied Sciences ◽

10.3390/app11135924 ◽

2021 ◽

Vol 11 (13) ◽

pp. 5924

Author(s):

Elisa Levi ◽

Simona Sgarbi ◽

Edoardo Alessio Piana

Keyword(s):

Thermal Characteristic ◽

Environmental Benefits ◽

Acoustic Properties ◽

Physical Parameters ◽

Industry Waste ◽

Acoustic Characterization ◽

Minimization Procedure ◽

The Difference ◽

By Products

From a circular economy perspective, the acoustic characterization of steelwork by-products is a topic worth investigating, especially because little or no literature can be found on this subject. The possibility to reuse and add value to a large amount of this kind of waste material can lead to significant economic and environmental benefits. Once properly analyzed and optimized, these by-products can become a valuable alternative to conventional materials for noise control applications. The main acoustic properties of these materials can be investigated by means of a four-microphone impedance tube. Through an inverse technique, it is then possible to derive some non-acoustic properties of interest, useful to physically characterize the structure of the materials. The inverse method adopted in this paper is founded on the Johnson–Champoux–Allard model and uses a standard minimization procedure based on the difference between the sound absorption coefficients obtained experimentally and predicted by the Johnson–Champoux–Allard model. The results obtained are consistent with other literature data for similar materials. The knowledge of the physical parameters retrieved applying this technique (porosity, airflow resistivity, tortuosity, viscous and thermal characteristic length) is fundamental for the acoustic optimization of the porous materials in the case of future applications.

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