Critical-temperature/Peierls-stress dependent size effects in body centered cubic nanopillars

Critical-temperature/Peierls-stress dependent size effects in body centered cubic nanopillars

The size-dependent plasticity of body centered cubic (bcc) metals is different from face centered cubic (fcc) metals: the size-effect exponent n varies for different bcc metal nanopillars (n = 0.8–1.0 for V, Nb; n = 0.3–0.5 for Ta, Mo, W). This inconsistency is first explained through a simple model...

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Veröffentlicht in:Applied physics letters 2013-01, Vol.102 (4)
Hauptverfasser: Min Han, Seung, Feng, Gang, Young Jung, Joo, Joon Jung, Hee, Groves, James R., Nix, William D., Cui, Yi
Format: Artikel
Sprache:eng
Schlagworte:
BCC metals
Body centered cubic lattice
Compressing
Nanocomposites
Nanomaterials
Nanostructure
Stresses
Transmission electron microscopy
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container_issue 4
container_start_page
container_title Applied physics letters
container_volume 102
creator Min Han, Seung
Feng, Gang
Young Jung, Joo
Joon Jung, Hee
Groves, James R.
Nix, William D.
Cui, Yi
description The size-dependent plasticity of body centered cubic (bcc) metals is different from face centered cubic (fcc) metals: the size-effect exponent n varies for different bcc metal nanopillars (n = 0.8–1.0 for V, Nb; n = 0.3–0.5 for Ta, Mo, W). This inconsistency is first explained through a simple model based on the temperature-dependent Peierls stress. The bcc V nanopillars with a low critical temperature and Peierls stress showed a fcc-like size effect with n = 0.79, and our in-situ TEM compression study revealed that fcc-like dislocation starvation occurred in bcc V nanopillars, indicating that a small Peierls stress in V contributes to the fcc-like behavior.
doi_str_mv 10.1063/1.4776658
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source AIP Journals Complete; AIP Digital Archive; Alma/SFX Local Collection
subjects BCC metals
Body centered cubic lattice
Compressing
Nanocomposites
Nanomaterials
Nanostructure
Stresses
Transmission electron microscopy
title Critical-temperature/Peierls-stress dependent size effects in body centered cubic nanopillars
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