Linear versus nonlinear acoustic probing of plasticity in metals: A quantitative assessment
Author
dc.contributor.author
Espinoza, Carolina
Author
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Feliú, Daniel
Author
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Aguilar, Claudio
Author
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Espinoza González, Rodrigo
Author
dc.contributor.author
Lund Plantat, Fernando
Author
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Salinas, Vicente
Author
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Mujica Fernández, Nicolás
Admission date
dc.date.accessioned
2018-12-20T15:25:10Z
Available date
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2018-12-20T15:25:10Z
Publication date
dc.date.issued
2018
Cita de ítem
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Materials, Volumen 11, Issue 11, 2018.
Identifier
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19961944
Identifier
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10.3390/ma11112217
Identifier
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https://repositorio.uchile.cl/handle/2250/159178
Abstract
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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 14–62%. The latter technique is, however, faster and simpler. As a main 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.