Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1584699 | Materials Science and Engineering: A | 2006 | 4 Pages |
Abstract
Mechanical spectroscopy has been used in order to investigate thermal stresses relaxation in the QE22 magnesium alloy (Mg–2Ag–2Nd) reinforced with 20 vol.% of δ-alumina short fibers (Saffil® fibers). Composite has been processed by a squeeze cast technique. Specimens have undergone thermal cycling between 20 and 450 °C with different temperature rate T˙ and excitation frequency ω. The relaxation of thermal stresses gives rise to additional internal friction. The mechanical loss versus temperature spectrum showed a transient maximum while heating and two maxima while cooling. A model where thermal stresses are relaxed by dislocation motion controlled by a solid friction mechanism has been used to interpret the experimental results.
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Authors
Z. Trojanová, B. Weidenfeller, W. Riehemann,