Journal
NATURE COMMUNICATIONS
Volume 10, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-09360-1
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Funding
- National Key R&D Program of China [2017YFA0204403]
- National Natural Science Foundation of China [51771121, 51590892, 11472243, 11621062, 51572173]
- Shanghai Municipal Science and Technology Commission [16060502300, 16JC402200, 18511110600]
- Fundamental Research Funds for the Central Universities [2018XZZX001-05]
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Understanding the deformation behavior of metallic materials containing nanotwins (NTs), which can enhance both strength and ductility, is useful for tailoring microstructures at the micro- and nano- scale to enhance mechanical properties. Here, we construct a clear deformation pattern of NTs in austenitic stainless steel by combining in situ tensile tests with a dislocation-based theoretical model and molecular dynamics simulations. Deformation NTs are observed in situ using a transmission electron microscope in different sample regions containing NTs with twin-lamella-spacing (lambda) varying from a few nanometers to hundreds of nanometers. Two deformation transitions are found experimentally: from coactivated twinning/detwinning (lambda < 5 nm) to secondary twinning (5 nm < lambda <129 nm), and then to the dislocation glide (lambda > 129 nm). The simulation results are highly consistent with the observed strong lambda-effect, and reveal the intrinsic transition mechanisms induced by partial dislocation slip.
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