Abstract
An Al–7%Si alloy was processed by high-pressure torsion (HPT) for five turns at room temperature under a pressure of 6 GPa. Microstructural examination after HPT revealed submicrometer grains and a homogeneous distribution of silicon particles. Near the peripheries of the HPT disks, there was precipitation of small Si particles, growth of larger Si particles and grain growth in particle-free zones around these larger particles. The effect is attributed to an estimated temperature rise of about 120–140 K during straining.
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