Deformation crossover : from nano- to meso scale.

Journal Article · Wed Dec 31 23:00:00 EST 2008 · Phys. Rev. Lett.

DOI:https://doi.org/10.1103/PhysRevLett.103.035502· OSTI ID:1024592

Cheng, S; Stoica, A D; Wang, X -L; Ren, Y; Almer, J; Houston, J A; Liu, C T; Clausen, B; Brown, D W; Liaw, P K; Zuo, L ^[1]

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1. X-Ray Science Division

In situ synchrotron and neutron diffraction were used to study deformation mechanisms in Ni over a broad range of grain sizes. The experimental data show that unlike in coarse-grained metals, where the deformation is dominated by dislocation slip, plastic deformation in nanocrystalline Ni is mediated by grain-boundary activities, as evidenced by the lack of intergranular strain and texture development. For ultrafine-grained Ni, although dislocation slip is an active deformation mechanism, deformation twinning also plays an important role, whose propensity increases with the grain size.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC; NSF of China
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1024592
• Report Number(s): ANL/XSD/JA-64979
• Journal Information: Phys. Rev. Lett., Journal Name: Phys. Rev. Lett. Journal Issue: 3 ; 2009 Vol. 103; ISSN 0003-6951
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DEFORMATION
DISLOCATIONS
GRAIN SIZE
NEUTRON DIFFRACTION
PLASTICS
SLIP
STRAINS
SYNCHROTRONS
TEXTURE
TWINNING