Abstract
Compressive creep tests of a magnesium alloy and its fibre composite (with 27 vol.% of Saffil fibres) were performed in temperature interval from 423 to 523 K in order to judge the strengthening influence of fibres and to analyse possibilities of an explanation of physical bases of the creep strain. Both materials were prepared by squeeze casting. From stress and temperature dependence of the minimum creep rates, activation parameters of creep, i.e., the apparent activation energy and the stress sensitivity parameter of creep rate, were evaluated and compared with the purpose to suggest possible mechanisms of creep deformation. In both materials investigated, the stress sensitivity parameters and the activations energies are relatively high and cannot be directly attributed to any creep mechanism. No threshold behaviour was observed in the stress dependence of the creep rates in both materials. A dependence of the creep behaviour on the orientation of composite specimens is presented.
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