Deformation crossover : from nano to meso scales.

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

DOI:https://doi.org/10.1103/PhysRevLett.103.035502· OSTI ID:978568

Cheng, S; Stoica, A D; Wang, X L; Ren, Y; Almer, J A; Horton, J A; Liu, C T; Clausen, B; Brown, D W; Zuo, L; Liaw, P K; ORNL,; LANL,

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
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 978568
• Report Number(s): ANL/XSD/JA-61454
• Journal Information: Phys. Rev. Lett., Journal Name: Phys. Rev. Lett. Journal Issue: 2009 Vol. 103; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

43 PARTICLE ACCELERATORS
DEFORMATION
DISLOCATIONS
GRAIN SIZE
NEUTRON DIFFRACTION
PLASTICS
SLIP
STRAINS
SYNCHROTRONS
TEXTURE
TWINNING