Issue |
Europhys. Lett.
Volume 68, Number 3, November 2004
|
|
---|---|---|
Page(s) | 405 - 411 | |
Section | Condensed matter: structure, mechanical and thermal properties | |
DOI | https://doi.org/10.1209/epl/i2004-10201-y | |
Published online | 16 October 2004 |
Twinning pathway in BCC molybdenum
1
Department of Nuclear Engineering, Massachusetts Institute of Technology Cambridge, MA 02139, USA
2
Handai Frontier Research Center, Osaka University - Osaka, Japan
3
Department of Mechanical Engineering and Systems, Osaka University Osaka 565-0871, Japan
4
Department of Materials Science and Engineering, Ohio State University Columbus, OH 43210, USA
5
Department of Materials Science and Engineering Massachusetts Institute of Technology - Cambridge, MA 02139, USA
Received:
27
May
2004
Accepted:
27
August
2004
The twinning energy
landscape of BCC
is determined using the density
functional theory for embryos containing 2 to 7 layers. The
2-layer embryo is metastable, whereas the 3- and 4-layer ones are
unstable. Layer-by-layer growth starts at 5 layers. The twin
boundary formation and migration energies are found to be
607
and 40
, respectively, indicating that
twin partial dislocations have wide cores and high mobilities. The
stress to homogeneously nucleate an additional partial loop on
the boundary of a sufficiently thick twin is only 1.4
;
this implies that once a deformation twin reaches critical
thickness, which we estimate to be 6 layers, subsequent growth
in thickness is easy.
PACS: 62.20.Fe – Deformation and plasticity (including yield, ductility, and superplasticity) / 61.72.Nn – Stacking faults and other planar or extended defects / 61.72.Mm – Grain and twin boundaries
© EDP Sciences, 2004
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