Abstract
Pure nickel and commercially pure (CP) aluminium were selected as model fcc materials for a detailed investigation of the experimental parameters influencing grain refinement and evolution of microstructure and microtexture during processing by high-pressure torsion (HPT). Samples were examined after HPT using microhardness measurements, transmission electron microscopy and orientation imaging microscopy. Processing by HPT produces a grain size of ∼170 nm in pure Ni and ∼1 μm in CP aluminium. It is shown that homogeneous and equiaxed microstructures can be attained throughout the samples of nickel when using applied pressures of at least ∼6 GPa after 5 whole revolution. In CP aluminium, a homogeneous and equiaxed microstructure was achieved after 2 whole revolutions under an applied pressure of 1 GPa. For these conditions, the distributions of grain boundary misorientations are similar in the centre and at the periphery of the samples. It is shown that simple shear texture develops in fcc metals subjected to high-pressure torsion. Some grain growth was detected at the periphery of the Al disk after 8 revolutions. The factors influencing the development of homogeneous microstructures in processing by HPT are discussed.
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Acknowledgements
This work was partially supported by INTAS-03513779 and RFBR-05-03-32233-a. One of the authors (APZ) thanks the National Research Council of the National Academy of Science (USA) and the Spanish Ministry of Education and Science (under Ramón y Cajal program) for financial support. The other authors were partially supported by the U.S. Air Force Office of Scientific Research under funding document no. F1ATA06058G001 (TRM) and the National Science Foundation of the United States under Grant No. DMR-0243331 (TGL).
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Zhilyaev, A.P., McNelley, T.R. & Langdon, T.G. Evolution of microstructure and microtexture in fcc metals during high-pressure torsion. J Mater Sci 42, 1517–1528 (2007). https://doi.org/10.1007/s10853-006-0628-0
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DOI: https://doi.org/10.1007/s10853-006-0628-0