Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 675, Issue -, Pages 323-337Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.08.072
Keywords
Nanostructured materials; Ductility; Texture; Precipitation; Aluminum alloys
Categories
Funding
- National Key Technology R&D Program of China [2015BAG20B04, 2015BAF06B01-3]
- National Natural Science Foundation of China [51175023, U1537212]
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A ductile nanostructured Al alloy with desired microstructure is tailored via the precipitation optimization and texture design. The microstructure consists of two-dimensional nano-laminated structure with strong texture and one-dimensional elongated sub-micron structure with intra-precipitations at nanoscale and sub-nanoscale level. The precipitation optimization is realized by the appropriate introduction of its embryo in the NS matrix before aging. The embryo is the solute-rich structures (solute clusters) segregated to dislocations due to strain-induced dissolution of initial precipitations into the matrix. These nano-precipitations not only impede dislocation motion but also accommodate plastic deformation during loading. The textured laminate activates the partial dislocation mechanism in high stacking-fault energy alloys and the extrinsic toughening mechanism during loading. In addition, the laminated structure exhibits significant texture strengthening. Therefore, both nano-precipitations and textured laminated structure are responsible for the simultaneous increase in strength and ductility. Additionally, the initial deformable precipitations play a positive role in microstructural refinement and the refined structure shows significant cluster strengthening, similar to 20% relative contribution to total strength. This paper provides a new understanding of designing nanostructured materials for achieving high ductility by several toughening strategies, which is expected to be applicable to other age-hard-enable alloys and steels as well. (C) 2016 Elsevier B.V. All rights reserved.
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