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Structure and Mechanical Properties of Al–Cu–Mg–Si Alloy Prepared by Selective Laser Melting

  • STRUCTURE, PHASE TRANSFORMATIONS, AND DIFFUSION
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Abstract

The effect of the physical and additive-manufacturing (3D printing) characteristics on the structure and hardness of monolith and netlike articles fabricated from the Al–Cu–Mg–Si alloy by selective laser melting,—is considered. The structure and hardness of monolith samples, which were synthesized at the laser powers P = 100–200 W, scanning speeds V = 400–950 mm/s, and unchanged both laser beam spot diameters of 60 and 75 µm and powder layer thickness of 0.05 mm,—were compared and analysed. It has been found that the hardness of samples synthesized at Р = 200 W and V = 750–900 mm/s is 50HB10/250; the minimum hardness (less than 28HB10/250) is observed for the samples fabricated at V = 400 mm/s and Р = 100 W. Metallographic studies of the structure of samples exhibit the presence of defects, such as shrinkage voids, hot cracks, and non-melt powder particles. Experimental data indicating the correlation between the build geometry of netlike samples characterized by different filling levels (amount and configuration of the internal construction holes) and their dynamic properties measured by Hopkinson–Kolsky compression tests are obtained. It has been found that the decrease in the density (ρ = 2.44 – 1.19 g/cm3) and increase in the total fraction of hole area in the build plane and plane perpendicular to the build plane from 4 to 86% leads to the decrease in the dynamic mechanical properties, namely, the yield stress and ultimate tensile strength by 3 and by 4.7 times, respectively.

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ACKNOWLEDGMENTS

We thank T.I. Yablonskikh and V.V. Astaf’ev for their participation in performed metallographic studies. Electron microscopic studies were carried out in the Center of Collaborative Assess “Test Center for Nanotechnologies and Advanced Materials,” Institute of Metal Physics, Ural Division, Russian Academy of Sciences.

Funding

This study was performed in terms of state assignment of the Ministry of Science and Higher Education of the Russian Federation (theme Struktura, no. АААА-А18-118020190116-6).

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Authors and Affiliations

  1. M.N. Miheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, 620108, Ekaterinburg, Russia

    I. G. Brodova & I. G. Shirinkina

  2. Russian Federal Nuclear Center, Zababakhin All-Russia Institute of Technical Physics, 456770, Snezhinsk, Russia

    A. N. Klenov & E. B. Smirnov

  3. Snezhinsk Physico-Technical Institute, National Research Nuclear University MEPhI, 456776, Snezhinsk, Russia

    N. Yu. Orlova

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  1. I. G. Brodova
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  2. A. N. Klenov
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  3. I. G. Shirinkina
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  4. E. B. Smirnov
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  5. N. Yu. Orlova
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Correspondence to I. G. Brodova.

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Brodova, I.G., Klenov, A.N., Shirinkina, I.G. et al. Structure and Mechanical Properties of Al–Cu–Mg–Si Alloy Prepared by Selective Laser Melting. Phys. Metals Metallogr. 122, 1220–1227 (2021). https://doi.org/10.1134/S0031918X21120036

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  • DOI: https://doi.org/10.1134/S0031918X21120036

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