Journal
ACTA MATERIALIA
Volume 176, Issue -, Pages 242-249Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2019.07.016
Keywords
Aluminum alloys; Transmission x-ray microscopy; Synchrotron tomography; In situ mechanical testing; Precipitates
Funding
- Army Research Office (ARO) [W911NF1410550]
- DOE Office of Science [DE-AC02-06CH11357]
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Even after nearly a century of extensive use of aluminum alloys in structural applications, our understanding of such precipitation-strengthened materials is far from complete. With the advent of next generation advanced characterization techniques, our ability to probe materials in unique ways and at different length scales has established a new paradigm for devising new pathways to alloy design by engineering materials and tailoring specific properties at the nanoscale. Here, we perform in situ nanomechanical testing in conjunction with synchrotron -based hard X-ray nanotomography to capture initiation and evolution of damage in 3D in Al-Cu alloys. Precipitates in these alloys are seen to exhibit unprecedented localized deformation in compression, which is attributed to novel observations of kinking in these brittle second-phase particles, accompanied with the generation of a fine polycrystalline texture in the adjacent matrix. We observe a size-dependent transition in precipitate deformation behavior that has been thoroughly investigated using a comprehensive correlative approach. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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