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Micromachines 2017, 8(1), 23; doi:10.3390/mi8010023

Effects of Process Conditions on the Mechanical Behavior of Aluminium Wrought Alloy EN AW-2219 (AlCu6Mn) Additively Manufactured by Laser Beam Melting in Powder Bed

1
Institute of Photonic Technologies (LPT), Friedrich-Alexander-Universität Erlangen-Nürnberg FAU, Konrad-Zuse-Straße 3/5, 91052 Erlangen, Germany
2
Collaborative Research Center 814—Additive Manufacturing (CRC 814), Am Weichselgarten 9, 91058 Erlangen-Tennenlohe, Germany
3
Erlangen Graduate School in Advanced Optical Technologies (SAOT), Paul-Gordan-Straße 6, 91052 Erlangen, Germany
4
Department of Laser Technologies, Kazan National Research Technical University, K. Marx Str. 10, 420111 Kazan, Russia
*
Author to whom correspondence should be addressed.
Academic Editor: Maria Farsari
Received: 22 November 2016 / Revised: 10 January 2017 / Accepted: 11 January 2017 / Published: 16 January 2017
(This article belongs to the Collection Laser Micromachining and Microfabrication)
View Full-Text   |   Download PDF [11391 KB, uploaded 16 January 2017]   |  

Abstract

Additive manufacturing is especially suitable for complex-shaped 3D parts with integrated and optimized functionality realized by filigree geometries. Such designs benefit from low safety factors in mechanical layout. This demands ductile materials that reduce stress peaks by predictable plastic deformation instead of failure. Al–Cu wrought alloys are established materials meeting this requirement. Additionally, they provide high specific strengths. As the designation “Wrought Alloys” implies, they are intended for manufacturing by hot or cold working. When cast or welded, they are prone to solidification cracks. Al–Si fillers can alleviate this, but impair ductility. Being closely related to welding, Laser Beam Melting in Powder Bed (LBM) of Al–Cu wrought alloys like EN AW-2219 can be considered challenging. In LBM of aluminium alloys, only easily-weldable Al–Si casting alloys have succeeded commercially today. This article discusses the influences of boundary conditions during LBM of EN AW-2219 on sample porosity and tensile test results, supported by metallographic microsections and fractography. Load direction was varied relative to LBM build-up direction. T6 heat treatment was applied to half of the samples. Pronounced anisotropy was observed. Remarkably, elongation at break of T6 specimens loaded along the build-up direction exceeded the values from literature for conventionally manufactured EN AW-2219 by a factor of two. View Full-Text
Keywords: additive manufacturing; 3D printing; powder bed fusion; aluminium copper wrought alloy EN AW-2219; AlCu6Mn; tensile test; Selective Laser Melting™ additive manufacturing; 3D printing; powder bed fusion; aluminium copper wrought alloy EN AW-2219; AlCu6Mn; tensile test; Selective Laser Melting™
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Karg, M.C.H.; Ahuja, B.; Wiesenmayer, S.; Kuryntsev, S.V.; Schmidt, M. Effects of Process Conditions on the Mechanical Behavior of Aluminium Wrought Alloy EN AW-2219 (AlCu6Mn) Additively Manufactured by Laser Beam Melting in Powder Bed. Micromachines 2017, 8, 23.

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