Abstract
Abstract In this paper, a new insight into the origin of the threshold stress is presented for a rapidly solidified Al–5Cr–2Zr (wt.%) alloy obtained by hot extrusion of powder particles of three different size fractions. The creep behaviour of this alloy at low temperature ( σ 0 . The value of σ 0 clearly diminishes as temperature increases. The magnitude of σ 0 is also strongly affected by the powder particle diameter, directly associated with the grain size: the larger the grain size, the lower the threshold stress. It is concluded that the threshold stress is related to the grain size through a Hall–Petch-type mechanism and that its temperature dependence is similar to the temperature dependence of the Hall–Petch coefficient.
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