Abstract
The plastic deformation of metals under dynamic loading is related to the evolution of dislocation structure and density which is thermal activation-dependent.The dynamic compressive experiment on LY12 aluminum alloy has been performed by Hopkinson bar at different temperatures. X-ray diffraction line profile analysis is adopted for the tested specimens to investigate the micro-and/or meso-scale structure evolution.The edge character of dislocations in the specimens was determined by analyzing the integral breadths of X-ray diffraction lines.The Fourier analysis of diffraction lines indicates that under dynamic loading,the dislocation density approaches to saturation rapidly at the initial stage of plastic deformation,dislocations are homogeneously distributed in the specimens.It also demonstrates that the dislocation density decreases with increasing testing temperature. Meanwhile the size of substructures has a tendency of broadening with temperature,especially in the range from 280℃to 300℃which corresponds to the temperature of dissolution of precipitated phase in the aluminum matrix.
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