- Load partitioning between phases in a cast AlSi12CuMgNi alloy was investigated by in-situ compression test during neutron diffraction experiments. Computed tomography (CT) was used to determine volume fractions of eutectic Si and intermetallic (IM) phases, and to assess internal damage after ex-situ compression tests. The CT reconstructed volumes showed the interconnectivity of IM phases, which build a 3D network together with eutectic Si. Large stresses were found in IMs, revealing their significant role as a reinforcement for the alloy. An existing micromechanical model based on Maxwell scheme was extended to the present case, assuming the alloy as a three-phase composite (Al matrix, eutectic Si, IM phases). The model agrees well with the experimental data. Moreover, it allows predicting the principal stresses in each phase, while experiments can only determine stress differences between the axial and radial sample directions. Finally, we showed that the addition of alloying elements not only allowed developing a 3D interconnectedLoad partitioning between phases in a cast AlSi12CuMgNi alloy was investigated by in-situ compression test during neutron diffraction experiments. Computed tomography (CT) was used to determine volume fractions of eutectic Si and intermetallic (IM) phases, and to assess internal damage after ex-situ compression tests. The CT reconstructed volumes showed the interconnectivity of IM phases, which build a 3D network together with eutectic Si. Large stresses were found in IMs, revealing their significant role as a reinforcement for the alloy. An existing micromechanical model based on Maxwell scheme was extended to the present case, assuming the alloy as a three-phase composite (Al matrix, eutectic Si, IM phases). The model agrees well with the experimental data. Moreover, it allows predicting the principal stresses in each phase, while experiments can only determine stress differences between the axial and radial sample directions. Finally, we showed that the addition of alloying elements not only allowed developing a 3D interconnected network, but also improved the strength of the Al matrix, and the ability of the alloy constituents to bear mechanical load.…
MetadatenAuthor details: | Sergei EvsevleevORCiD, Tatiana MishurovaORCiDGND, Sandra CabezaORCiD, R. Koos, Igor SevostianovORCiD, Gonzales Garcés, Guillermo RequenaGND, R. Fernandez, Giovanni BrunoORCiDGND |
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DOI: | https://doi.org/10.1016/j.msea.2018.08.070 |
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ISSN: | 0921-5093 |
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ISSN: | 1873-4936 |
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Title of parent work (English): | Materials Science and Engineering: A-Structural materials: properties, microstructure and processing |
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Publisher: | Elsevier |
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Place of publishing: | Lausanne |
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Publication type: | Article |
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Language: | English |
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Year of first publication: | 2018 |
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Publication year: | 2018 |
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Release date: | 2021/07/26 |
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Tag: | Aluminum alloys; Computed tomography; Damage; Internal stress; Micromechanical modeling; Neutron diffraction |
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Volume: | 736 |
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Number of pages: | 12 |
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First page: | 453 |
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Last Page: | 464 |
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Funding institution: | Deutsche Forschungsgemeinschaft, DFG (Germany)German Research Foundation (DFG) [BR 5199/3-1] |
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Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
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DDC classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
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Peer review: | Referiert |
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