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Microplastic Deformation in Polycrystalline Zinc due to Anisotropic Thermal Expansion of Zinc Grains

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The resonance frequency of vibration and the mechanical dissipation of polycrystalline zinc plates were measured as functions of temperature between 85 K and 296 K, for resonance frequencies of the order of 13 kHz. An anomalous drop in the resonance frequency accompanied by an enormous increase in dissipation were detected as the temperature was decreased. This anomaly is explained in terms of microplastic deformations produced by intergranular stresses resulting from anisotropic thermal expansion parallel to the “c” and “a” axes of zinc crystals. The effect of the rate of cooling on the behaviour of the resonance frequency was also studied.

Zusammenfassung

Die Resonanzfrequenzen und die mechanischen Verluste von Platten aus polykristallinem Zink wurden als Funktion der Temperatur zwischen 85 K und 296 K fér Frequenzen im Bereich von 13 kHz gemessen. Bei abneh-mender Temperatur wurde ein anormaler Einbruch der Resonanzfrequenz beobachtet, begleitet von einer enormen Zunahme der Verluste. Die Anomalie wird durch mikroplastische Deformationen erklärt, die durch Span nungen zwischen den Körnern aufgrund der anisotropenthermischen Ausdehnung parallel zur c- und a-Achse von Zinkkristallen hervorgerufen werden. Des weiteren wur de die Auswirkung der Abkühlungsrate auf das Verhalten der Resonanzfrequenz untersucht.

Sommaire

Des mesures de fréquences de résonance et de dissipation mécanique ont été conduites sur des plaques de zinc polycristallin en fonction de la température entre 85 Ket 296 K, et pour des fréquences de l'ordre de 13 kHz. Lorsque l'on abaisse la température on assiste à unechute anormale de la fréquence de résonance, accompagnée d'un accroissement considérable de la dissipation. On explique cette anomalie par des déformationsmicroplastiques produites par des contraintes intergra-nulaires résultant d'une dilatation thermique anisotrope parallèle aux axes «c» et «a» des cristaux de zinc. L'étudea porté également sur l'effet de la vitesse de refroidisse-ment sur les variations de la fréquence de resonance.
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Document Type: Research Article

Publication date: 01 February 1992

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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