In this work, we studied the transformations involving the coherent (θ”/S”), semicoherent (θ’/S’), and incoherent (θ/S) precipitates (θ = Al2Cu, S = Al2CuMg) formed during the heat treatment of an annealed nanostructured powder of Al 2024 produced by cryogenic milling. These precipitates form over a wide temperature range (300–500 °C) depending on the chemical composition. They influence grain growth during sintering and may facilitate the formation of a fully dense nanostructured material. Mechanical milling was performed for 20 h at a cryogenic temperature to obtain nanostructured particles. The structural evolution and morphology of the particles during the heat treatment were investigated for three particle size ranges (<25, 25–45, and 45–90 μm). Heat treatment of the milled powder was performed at three different temperatures (475, 500, and 525 °C) for 5, 10, 15, and 20 min. Morphological analysis of the as-milled particles using scanning electron microscopy indicated that the milling process was not completed. X-ray diffraction analysis yielded the θ and S volume fractions for the heat-treated and as-milled powders. DSC analysis indicated the precipitation and dissolution of GP (Guinier-Preston zone), coherent, and incoherent precipitates during heating of the as-atomized and milled powders. Accumulation of the deformation energy during milling is suggested to lead to an early transformation of the S and θ phases in the finer powder. ©2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Effect of nanostructure on phase transformations during heat treatment of 2024 aluminum alloy / B. Demétrio, K.; G. Nogueira, A. P.; Menapace, C.; Bendo, T.; Molinari, A.. - In: JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY. - ISSN 2238-7854. - 14:(2021), pp. 1800-1808. [10.1016/j.jmrt.2021.07.044]

Effect of nanostructure on phase transformations during heat treatment of 2024 aluminum alloy

Menapace, C.;Molinari, A.
2021-01-01

Abstract

In this work, we studied the transformations involving the coherent (θ”/S”), semicoherent (θ’/S’), and incoherent (θ/S) precipitates (θ = Al2Cu, S = Al2CuMg) formed during the heat treatment of an annealed nanostructured powder of Al 2024 produced by cryogenic milling. These precipitates form over a wide temperature range (300–500 °C) depending on the chemical composition. They influence grain growth during sintering and may facilitate the formation of a fully dense nanostructured material. Mechanical milling was performed for 20 h at a cryogenic temperature to obtain nanostructured particles. The structural evolution and morphology of the particles during the heat treatment were investigated for three particle size ranges (<25, 25–45, and 45–90 μm). Heat treatment of the milled powder was performed at three different temperatures (475, 500, and 525 °C) for 5, 10, 15, and 20 min. Morphological analysis of the as-milled particles using scanning electron microscopy indicated that the milling process was not completed. X-ray diffraction analysis yielded the θ and S volume fractions for the heat-treated and as-milled powders. DSC analysis indicated the precipitation and dissolution of GP (Guinier-Preston zone), coherent, and incoherent precipitates during heating of the as-atomized and milled powders. Accumulation of the deformation energy during milling is suggested to lead to an early transformation of the S and θ phases in the finer powder. ©2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
2021
B. Demétrio, K.; G. Nogueira, A. P.; Menapace, C.; Bendo, T.; Molinari, A.
Effect of nanostructure on phase transformations during heat treatment of 2024 aluminum alloy / B. Demétrio, K.; G. Nogueira, A. P.; Menapace, C.; Bendo, T.; Molinari, A.. - In: JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY. - ISSN 2238-7854. - 14:(2021), pp. 1800-1808. [10.1016/j.jmrt.2021.07.044]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/313993
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