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A high temperature tensile test has been performed at 450 °C with various strain rates and grain sizes for an Al–4Mg–0.4Sc alloy. The experimental results show that the total elongation is strongly sensitive to the grain size and is approximately a linear function of an inverse average grain size. The Portevin–Lechatellier (P-L) effect with significant serrations on the stress–strain curves during...
The cavity growth process during superplastic deformation has been studied. A model for this process is proposed based on the theory of grain-boundary-sliding (GBS) and the theory of cavity growth. According to the deduced equation, the relationship between fracture strain and grain size at a specific temperature and strain rate is analyzed and discussed. It shows that the total elongation is an approximated...
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