[Kovove materialy - Metallic materials]
    Thu - March 28, 2024 - 19:49 No. of hits : 1736466 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 36 (1998), Issue 1

Internal friction in a Mg matrix composite after thermal cycling between room temperature and various upper temperatures
TROJANOVA, Z., LUKAC, P., KIEHN, J., KAINER, K. U., MORDIKE, B. L.
vol. 36 (1998), no. 1, pp. 33 - 41

Abstract
This paper describes the influence of thermal cycling on the damping behaviour of a Mg - 26.0 vol.% Al2O3 composite. The composite was prepared by squeeze casting. The logarithmic decrement as the characteristics of the process responsible for the damping behaviour was measured after ten thermal cycles between room temperature and an upper temperature. The upper temperature was varied in the interval from 100 to 450 °C. The strain dependence of the logarithmic decrement can be divided into two regions. A region of strain amplitude independent damping at low strains is followed by a region with amplitude dependent damping at higher strains. The damping level in the strain amplitude independent region depends weakly on the upper temperature of the cycle whereas the values of the logarithmic decrement in the strain amplitude dependent region depend very sensitively on the upper temperature of the cycles. The observed experiment data can be explained considering creation of new dislocations during thermal cycling.

Key words
thermal cycling, Mg - Al2O3 composite, logarithmic decrement, damping behaviour

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
The official abbreviation in accordance with JCR ISI is Kovove Mater.


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