Deformation twinning in nanocrystalline materials
نویسندگان
چکیده
منابع مشابه
Deformation twinning in nanocrystalline materials
Nanocrystalline (nc) materials can be defined as solids with grain sizes in the range of 1–100 nm. Contrary to coarse-grained metals, which become more difficult to twin with decreasing grain size, nanocrystalline face-centered-cubic (fcc) metals become easier to twin with decreasing grain size, reaching a maximum twinning probability, and then become more difficult to twin when the grain size ...
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We report transmission electron microscope observations that provide evidence of deformation twinning in plastically deformed nanocrystalline aluminum. The presence of these twins is directly related to the nanocrystalline structure, because they are not observed in coarse-grained pure aluminum. We propose a dislocation-based model to explain the preference for deformation twins and stacking fa...
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Jin-Yu Zhang,1 Gang Liu,1,*,† Rui Hong Wang,1 Ju Li,2,*,‡ Jun Sun,1 and Evan Ma1,3,*,§ 1State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China 2Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA 3Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, ...
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Macroscopic strain was hitherto considered a necessary corollary of deformation twinning in coarse-grained metals. Recently, twinning has been found to be a preeminent deformation mechanism in nanocrystalline face-centered-cubic (fcc) metals with medium-to-high stacking fault energies. Here we report a surprising discovery that the vast majority of deformation twins in nanocrystalline Al, Ni, a...
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ژورنال
عنوان ژورنال: Progress in Materials Science
سال: 2012
ISSN: 0079-6425
DOI: 10.1016/j.pmatsci.2011.05.001