Mechanism of grain growth during severe plastic deformation of a nanocrystalline Ni-Fe alloy

Journal Article · Wed Dec 31 23:00:00 EST 2008 · Applied Physics Letters

OSTI ID:962323

Li, Hongqi ^[1]; Wang, Y B ^[2]; Ho, J C ^[2]; Liao, X Z ^[2]; Zhu, Y T ^[2]; Ringer, S P ^[2]

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1. Los Alamos National Laboratory
2. NON LANL

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.

• Research Organization: Los Alamos National Laboratory (LANL)
• Sponsoring Organization: DOE
• DOE Contract Number: AC52-06NA25396
• OSTI ID: 962323
• Report Number(s): LA-UR-09-01419; LA-UR-09-1419
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
DEFORMATION
DISLOCATIONS
GRAIN GROWTH
PLASTICS
ROTATION
TORSION
TRANSMISSION ELECTRON MICROSCOPY