Application of ultrasonic methods to determine elastic anisotropy of polycrystalline copper processed by equal-channel angular pressing

Seiner, Hanuš; Bodnárová, Lucie; Sedlák, Petr; Janeček, Miloš; Srba, Ondřej; Král, Róbert; Landa, Michal

doi:10.1016/j.actamat.2009.08.071

Cited by 47 publications

(27 citation statements)

References 18 publications

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“…Importantly, the isotropy was reached for all CS materials, although these materials belong to different crystallographic classes and the corresponding bulk materials differ significantly in a number of mechanical properties. For the copper coating, in particular, the observed anisotropy was even weaker than anisotropy of bulk polycrystalline copper with significant crystallographic texture and strongly anisotropic spatial arrangement of grain boundaries reported in [27].…”

Section: Rus Resultsmentioning

confidence: 95%

“…It is therefore assumed that this behavior can be interpreted as a result of intense plastic deformation of the sprayed material during the CS process, leading to grain refinement and, consequently, to enhanced grain boundary sliding. From this point of view, the elasticity of CS coatings may exhibit features similar to bulk materials processed by severe plastic deformation methods, for which the slight softening of elastic constants and simultaneous increase of internal friction due to grain refinement is also well detectable by RUS measurements [27,41]. .…”

Section: Discussionmentioning

confidence: 99%

“…The engineering constants E IP and E OOP introduced in the Introduction can be then recalculated from c ij by simple algebraic relations (see e.g. [27]). …”

Section: Resonant Ultrasound Spectrocopymentioning

confidence: 99%

“…The resonant spectra were complemented by pulse-echo measurements of phase velocity of longitudinal waves in directions perpendicular to the individual faces of the samples [27], i.e. in the in-plane (v IP ) and out-of-plane (v OOP ) directions.…”

Section: Resonant Ultrasound Spectrocopymentioning

confidence: 99%

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Elastic moduli and elastic anisotropy of cold sprayed metallic coatings

Seiner

Sedlák

Huang³

et al. 2016

Surface and Coatings Technology

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such as plasma spraying [8,9,10], the CS process does not involve substantial heating or melting of the sprayed powders. Instead, the formation of the coating arises from a severe plastic deformation of the accelerated powder particles upon their impingement at the substrate [11,12]. Thereby, the oxidation or phase changes in the feedstock material are effectively reduced, as well as e.g. the magnitude of the secondary residual stresses arising from the thermal expansion mismatch [13]. As such, CS has recently received a lot of attention as a novel method applicable for sensitive metals and alloys that readily undergo chemical or structural changes at elevated temperatures. Among the sprayed metallic prepared by water-stabilized plasma (WSP) spraying. In all reported cases, the difference between the in-plane and out-of plane properties of the coatings were significant, with the values of the ratio α = E OOP /E IP between the out-of-plane Young's modulus (E OOP ) and the in-plane Young's modulus (E IP ) ranging from 0.36 (for APS [19]) to 0.87 (for WSP [23]). Here we apply this method to determine the elastic constants and the strength of anisotropy for pure copper, aluminum, titanium and nickel coatings prepared by CS. The main advantage of the RUS method is that it enables the determination of all independent elastic constants of an anisotropic solid from measurements of one small sample. In addition, the RUS enables also a direct assessment of the internal friction parameter of the examined material Q −1 [21], which may bring an additional information on the integrity of the sprayed material or on density and activity of defects in it [24].

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Section: Rus Resultsmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

“…The engineering constants E IP and E OOP introduced in the Introduction can be then recalculated from c ij by simple algebraic relations (see e.g. [27]). …”

Section: Resonant Ultrasound Spectrocopymentioning

confidence: 99%

Section: Resonant Ultrasound Spectrocopymentioning

confidence: 99%

See 2 more Smart Citations

Elastic moduli and elastic anisotropy of cold sprayed metallic coatings

Seiner

Sedlák

Huang³

et al. 2016

Surface and Coatings Technology

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“…As shown for polycrystalline copper by Seiner et al [38], the ECAP can induce a measurable elastic anisotropy that changes with the individual ECAP passes. In order to inspect whether any similar effect can be observed also for the AZ31 alloy, the 0P, 1P, 2P, and 4P samples were analyzed using the same experimental procedure as for copper in [38]. For these measurements, a fully contactless RUS set-up described in details in [27] was used.…”

Section: Rus Measurementsmentioning

confidence: 94%

An ultrasonic internal friction study of ultrafine-grained AZ31 magnesium alloy

et al. 2014

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Internal friction in ultrafine-grained AZ31 magnesium alloy is investigated by resonant ultrasound spectroscopy. It is shown that the internal friction significantly increases at elevated temperatures (J100°C), and that this increase can be attributed to grain boundary sliding (GBS). The evolution of this phenomenon with grain refinement is studied by comparing the results obtained for an extruded material and for materials after additional one, two, and four passes of equal channel angular pressing. It is observed that the activation energy for diffusive GBS significantly decreases with decreasing grain size, and so does also the threshold temperature above which this internal friction mechanism is dominant. The results prove that the ultrafine-grained AZ31 alloys exhibit diffusive GBS at temperatures close to the ambient temperature, which is an interesting finding with respect to the possible applications of these alloys in superplastic forming technologies.

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