Journal
PHYSICAL REVIEW LETTERS
Volume 109, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.225501
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Funding
- 973 Program [2011CB933300]
- National Natural Science Foundation of China [51071110, 40972044, 51271134, J1210061]
- China MOE NCET Program [NCET-07-0640]
- MOE Doctoral Fund [20090141110059]
- Fundamental Research Funds for the Central Universities
- NSF CMMI through University of Pittsburgh [08 010934]
- Sandia National Lab
- U.S. Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000]
- Chinese Scholarship Council
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [0928517] Funding Source: National Science Foundation
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The formation and vanishing processes of a low angle grain boundary (GB) in nanosized Au during tension and release of stress, respectively, were obsvered by in situ high resolution transmission electron microscopy. The nucleation of perfect dislocations led to the formation of a 15 degrees low angle GB inside an Au nanocrystal upon off-axial tensile loading (coupled uniaxial tensile and bending stress). Strikingly, the dislocations were completely annihilated accompanied with the disappearance of the GB after the removal of external stress, indicating that plastic bending is recoverable in the nanocrystal. The back force and surface stress played important roles in such a pseudoelastic behavior. This transient GB dynamics cannot be captured in ex situ experimental investigations. Such pseudoelastic bending deformation in nanosized crystals will have an important impact on the designing of nanomechanical devices with ultrahigh bending capability.
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