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In situ transmission electron microscopy tensile experiments were carried out to investigate lattice dislocation and twin boundary (TB) interaction in Cu with nanoscale growth twins. Results show that...
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Stabilizing nanostructured materials by coherent nanotwins and their grain boundary triple junction drag

Appl. Phys. Lett. 94, 021910 (2009); doi:10.1063/1.3072595

Published 16 January 2009

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C. Saldana,1 T. G. Murthy,1 M. R. Shankar,2 E. A. Stach,3,4 and S. Chandrasekar1
1Center for Materials Processing and Tribology, Purdue University, West Lafayette, Indiana 47907-2023, USA
2Department of Industrial Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA
3School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907-2023, USA
4Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907-2023, USA
The role of nanotwin lamellae in enhancing thermal stability of nanostructured materials is examined. Nanostructured copper with varying densities of twins was generated by controlling the deformation strain rate during severe plastic deformation at cryogenic temperatures. While the nanostructured materials produced under cryogenic conditions are characteristically unstable even at room temperatures, their stability is markedly improved when a dense dispersion of nanotwins is introduced. Observations of the role of nanotwins in pinning grain and subgrain structures suggest an interfacial engineering approach to enhancing the stability of nanostructured alloys. ©2009 American Institute of Physics
History: Received 15 July 2008; accepted 26 December 2008; published 16 January 2009
Permalink: http://link.aip.org/link/?APPLAB/94/021910/1
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KEYWORDS and PACS

Keywords
PACS
  • 61.72.Mm
    Grain and twin boundaries
  • 65.80.+n
    Thermal properties of small particles, nanocrystals, nanotubes
  • 81.40.Lm
    Deformation, plasticity, and creep
  • YEAR: 2009

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ISSN:
0003-6951 (print)   1077-3118 (online)
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