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Creep Mechanism Determination on Dispersed Phase Amalgams using High Resolution Electron Microscopy (HRTEM) Observation

Published online by Cambridge University Press:  02 July 2020

Quintero H. Amado ,
Caballero A. Ramon A  and
Hilders G. O
Quintero H. Amado
Affiliation:
Stevens Institute of Technology, Department of Chemical, Biochemical and Materials Engineering, Hoboken, NJ07030
Caballero A. Ramon A
Affiliation:
Centro de Investigation y Desarrollo en Biomateriales, Facultad de Ingenieria Universidad Central de Venezuela, Apartado Postal 47711, Los Chaguaramos, 1041, Caracas, Venezuela.
Hilders G. O
Affiliation:
Centro de Investigation y Desarrollo en Biomateriales, Facultad de Ingenieria Universidad Central de Venezuela, Apartado Postal 47711, Los Chaguaramos, 1041, Caracas, Venezuela.
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Extract

Creep mechanism determination on dental amalgams has been a subject of interest in recent research works. Most of these studies conclude that the creep behavior can be explained by the well-known expression: ɛ = A σnexp (-Q/RT). Reported values for n (potential coefficient of stress) are in the order of 3 for phase dispersed dental amalgams and 2 for conventional amalgams. It suggests a grain sliding creep mechanism for conventional amalgams and a climb dislocation mechanism for creep in phase dispersed amalgams due to interactions with the dispersed CuxSny particles typical of this kind of amalgam(l). For both cases, the creep process occurs inside the γ (Ag2Hg3) phase matrix of low melting point (310 °K) which is slightly higher than typical mouth temperatures of about 400 °K (37 °C). In this work some microestructural evidences are obtained to support the behavior described above by using High Resolution Transmission Electron Microscopy (HRTEM).

Type
High Resolution Electron Microscopy
Information
Microscopy and Microanalysis , Volume 6 , Issue S2: Proceedings: Microscopy & Microanalysis 2000, Microscopy Society of America 58th Annual Meeting, Microbeam Analysis Society 34th Annual Meeting, Microscopical Society of Canada/Societe de Microscopie de Canada 27th Annual Meeting, Philadelphia, Pennsylvania August 13-17, 2000 , August 2000 , pp. 1042 - 1043
Copyright
Copyright © Microscopy Society of America

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References

References:

(1)Greener, E., et al,.Time-temperature behavior for creep of dental amalgam, Journal of Biomedical Materials Research, Vol. 14, 1980, pp 161–171.CrossRefGoogle ScholarPubMed
(2)Greener, E., et al, The creep compliance of dental amalgam in the stress range of 20-80 MPa., Journal of Biomedical Materials Research, Vol. 16, 1982, pp 599–608.CrossRefGoogle ScholarPubMed
(3)Okabe, T., et al, Grain boundary Sliding and Creep in Dental Amalgams, AADR Abstracts 1980,pp292.Google Scholar