Abstract
The deformation mechanism of alloy in the semi-solid state has been investigated, with the compression of 2024 Al alloy in the semi-solid state as an example. Experimental results showed that the compressive deformation of 2024 Al alloy in the semi-solid state was mainly caused by the liquid flowing under the hydrostatic compressive stress, the grain boundary sliding under the shear stress and the plastic deformation of grain under the normal compressive stress. Among them, the grain boundary sliding was mainly accommodated by the nucleation and growth of cavity under the hydrostatic tensile stress.
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