Journal
MATERIALS CHARACTERIZATION
Volume 58, Issue 10, Pages 848-853Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2006.08.001
Keywords
severe plastic deformation; high pressure torsion; tungsten fragmentation; fractal distribution; nano-composite
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A coarse-grained W-25%Cu alloy with a tungsten particle size of 2-10 mu m is subjected to severe plastic deformation by high-pressure torsion at different temperatures. The evolution of the microstructure with increasing strain is investigated. It is shown that high-pressure torsion deformation causes a strong refinement of tungsten particles. It is found that the tungsten particle fragmentation during high-pressure torsion follows the fractal distribution and demonstrates a multi-fractal behavior. Similarity of this fragmentation process with fragmentation observed in nature at the macro-, micro-, and nano-levels is discussed. (c) 2006 Elsevier Inc. All rights reserved.
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