Microstructural Evolution in Pure Aluminum in the Early Stages of Processing by High-Pressure Torsion

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  • Xu Cheng
    Departments of Aerospace & Mechanical Engineering and Materials Science University of Southern California
  • Horita Zenji
    Department of Materials Science and Engineering, Faculty of Engineering Kyushu University
  • Langdon Terence G.
    Departments of Aerospace & Mechanical Engineering and Materials Science University of Southern California Materials Research Group, School of Engineering Sciences University of Southampton

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Measurements were taken to evaluate the evolution of homogeneity in disks of high-purity aluminum in the early stages of processing by high-pressure torsion. The results demonstrate that samples processed through 1/4 or more whole revolutions exhibit microhardness values which are generally higher in the centers of the disks than at the edges whereas after 1/8 turn the hardness is higher at the edge than in the center. It is shown that all of the hardness measurements are mutually consistent and they scatter around a unique curve when plotted against the equivalent strain. The measurements of hardness are supplemented by microstructural observations which provide evidence of a gradual evolution in the microstructure with increasing strain from an initial formation of subgrains to an array of ultrafine grains separated by boundaries having high angles of misorientation.

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