Abstract
Deformation induced grain growth has been widely reported in nanocrystalline materials. However, the grain growth mechanism remains an open question. This study applies high-pressure torsion to severely deform bulk nanocrystalline Ni-20 wt % Fe disks and uses transmission electron microscopy to characterize the grain growth process. Our results provide solid evidence suggesting that high pressure torsion induced grain growth is achieved primarily via grain rotation for grains much smaller than 100 nm. Dislocations are mainly seen at small-angle subgrain boundaries during the grain growth process but are seen everywhere in grains after the grains have grown large. © 2009 American Institute of Physics.
Original language | English |
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Article number | 011908 |
Journal | Applied Physics Letters |
Volume | 94 |
Issue number | 1 |
Online published | 7 Jan 2009 |
DOIs | |
Publication status | Published - Jan 2009 |
Externally published | Yes |