<i>In situ</i> characterization of local elastic properties of thin shape memory films by surface acoustic waves

Grabec, Tomáš; Sedlák, Petr; Stoklasová, Pavla; Thomasová, Martina; Shilo, Doron; Kabla, M.; Seiner, Hanuš; Landa, Michal

doi:10.1088/0964-1726/25/12/127002

Cited by 19 publications

(6 citation statements)

References 27 publications

(54 reference statements)

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“…Transient grating spectroscopy (TGS) is an experimental method for measuring surface acoustic wave (SAW) velocity, involving excitation and detection of narrowband SAWs. In this work, the modification of this setup as described in [16] was used. The narrowband excitation was achieved by sending a pump-beam (1064 nm, pulse energy 90 µJ, pulse duration 400 ps) through a diffraction transmission grating.…”

Section: Tgs Measurementmentioning

confidence: 99%

Elastic constants of Ti-15Mo single crystals and their evolution with thermal treatment

et al. 2020

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Elastic constants of single crystals of metastable β-phase of the Ti-15Mo alloy were studied by ultrasonic methods with the aim to observe the dependence of these constants on formation of isothermal ω particles. Two ultrasonic methods were applied: resonant ultrasound spectroscopy for monitoring the temperature evolution of the elastic constants, and transient grating spectroscopy for identification of the local material symmetry at a fixed temperature. Samples with different heat treatments (isothermal ageing at 300 °C and ageing under the same temperature with uniaxial [111] loading) were studied. The results prove that the isothermal omega particles always exactly follow the original cubic symmetry of the β matrix, and that the evolutions of the elastic constants of the β-ω multi-phase crystals can be reliably approximated using Hill’s homogenizing procedure, assuming cubic elastic constants of the β-phase and isotropic elastic constants representing the ω particles.

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Section: Tgs Measurementmentioning

confidence: 99%

Elastic constants of Ti-15Mo single crystals and their evolution with thermal treatment

et al. 2020

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“…The SAWs method has been used in finding the mechanical properties such as thickness and Young's modulus of films from 40 nm to 1 µm thick [18], [26]- [28]. It has also been used in finding the temperature effect on Young's modulus of alloys [29] and measuring damage of a steel surface [30]. The results from SAWs measurement is very similar or even better than the results from nanoindention method [31], [32].…”

Section: Background Of Acoustic Measurementsmentioning

confidence: 99%

Characterization of mechanical properties of thin-film Li-ion battery electrodes from laser excitation and measurements of zero group velocity resonances

Yao

Cassler

Wheeler

et al. 2019

Journal of Applied Physics

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The mechanical properties of thin-film Li-ion battery electrodes are controlled by the micro structure of the constituent materials. In this work, a non-contact and non-destructive measurement of the mechanical properties of electrode films is performed by measurement of zerogroup velocity (ZGV) resonances. The ZGV Lamb wave modes of a solid bilayer consisting of a thin metallic layer and a thin compliant coating layer are shown to be dependent on the Young's moduli, thicknesses, densities and Poisson ratios of the layers. Theoretical models are used to quantify the sensitivity of the ZGV resonances to changes in mechanical properties. Experimental ZGV resonances are excited using a pulsed infrared laser and detected using a laser interferometer. Commercial-grade battery films with different coating materials, densities and thicknesses are measured. Young's moduli of the battery electrode layers are estimated using the combination of a theoretical model and experimental results. The effect of the calendering process on the battery materials is also investigated. Results suggest that the Young's modulus of the electrode coating increases drastically after the battery films are calendered. This technique can be used to quantitatively study the mechanical properties of Li-ion battery electrodes to improve overall battery performance.

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“…This velocity dispersion can be used to find the elastic properties and thickness of the thin film [20]. This technique has been used to find one or two mechanical properties of various thin films less than 1 µm thick [21], [22], the Young's modulus of films as thin as 100 nm [20], the Young's modulus and porosity of 500-nm-thick films [23], the elastic properties of ultrathin (less than 40 nm thick) films [24], changes in a steel surface due to radiation damage [25], and changes in the Young's modulus of films of shape memory alloys at different temperatures [26]. It has also been compared to nanoindentation for finding the elastic modulus of thin films with a high surface roughness [27] and nanostructured films with surface roughness [28], where the SAW method gave results similar to or better than nanoindentation.…”

Section: Previous Acoustic Workmentioning

confidence: 99%

Characterization of mechanical properties of battery electrode films from acoustic resonance measurements

Dallon

Yao

Wheeler

et al. 2018

Journal of Applied Physics

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and Computer Engineering, BYU Master of Science Measurements of the mechanical properties of lithium-ion battery electrode films can be used to quantify and improve manufacturing processes and to predict the mechanical and electrochemical performance of the battery. This thesis demonstrates the use of acoustic resonances to distinguish among commercial-grade battery films with different active electrode materials, thicknesses, and densities. Resonances are excited in a clamped circular area of the film using a pulsed infrared laser or speaker and responses are measured using an electret condenser microphone. A numerical model is used to quantify the sensitivity of resonances to changes in mechanical properties. When the numerical model is compared to simple analytical models for thin plates and membranes, the battery films measured here trend more similarly to the membrane m odel. Resonance measurements are also used to monitor the drying process. Results from a scanning laser Doppler vibrometer verify the modes excited in the films, and a combination of experimental and simulated results is used to estimate the Young's modulus of the battery electrode coating layer.

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In situ characterization of local elastic properties of thin shape memory films by surface acoustic waves

Cited by 19 publications

References 27 publications

Elastic constants of Ti-15Mo single crystals and their evolution with thermal treatment

Elastic constants of Ti-15Mo single crystals and their evolution with thermal treatment

Characterization of mechanical properties of thin-film Li-ion battery electrodes from laser excitation and measurements of zero group velocity resonances

Characterization of mechanical properties of battery electrode films from acoustic resonance measurements

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