Effect of Annealing Heat Treatment on the Macroscopic and Microscopic Deformation Behavior of Additively Manufactured AlSi10Mg Alloy

doi:10.11900/0412.1961.2024.00116

Acta Metall Sin

2024, Vol. 60

Issue (8): 1091-1099 DOI: 10.11900/0412.1961.2024.00116

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Effect of Annealing Heat Treatment on the Macroscopic and Microscopic Deformation Behavior of Additively Manufactured AlSi10Mg Alloy

ZHANG Xingxing¹(

), LUTZ Andreas², GAN Weimin³, MAAWAD Emad³, KRIELE Armin⁴

1 Multi-disciplinary Research Division, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
2 Mercedes Benz AG, Research and Development Department, Leibnizstr. 2, 71032 Böblingen, Germany
3 Institute of Materials Physics, Helmholtz-Zentrum Hereon, Max-Planck-Str. 1, 21502 Geesthacht, Germany
4 German Engineering Materials Science Centre (GEMS) at Heinz Maier-Leibnitz Zentrum (MLZ), Helmholtz-Zentrum Hereon, 85748 Garching, Germany

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ZHANG Xingxing, LUTZ Andreas, GAN Weimin, MAAWAD Emad, KRIELE Armin. Effect of Annealing Heat Treatment on the Macroscopic and Microscopic Deformation Behavior of Additively Manufactured AlSi10Mg Alloy. Acta Metall Sin, 2024, 60(8): 1091-1099.

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Abstract

The additively manufactured AlSi10Mg alloy demonstrates considerable residual stresses, adversely affecting the dimensional accuracy, operational safety, and corrosion resistance of the parts. In practical applications, stress relief annealing is necessary to eliminate residual stresses in residual stress-sensitive applications. However, the current understanding of the mechanical properties of the additively manufactured AlSi10Mg alloy after annealing is still limited to the macroscopic level. To further investigate the micromechanical behavior and intrinsic mechanisms of the alloy, this study employed synchrotron X-ray diffraction technology to conduct in situ deformation analysis. This study thoroughly examined the lattice strain and stress evolutions of the Al and Si phases and clarified the individual contribution of each phase to the strain hardening rate of the alloy. In addition, this study quantitatively assessed the evolution of dislocation density and elucidated the influences of annealing heat treatment on the load transfer and dislocation behavior of the additively manufactured AlSi10Mg alloy.

Key words: synchrotron X-ray diffraction in situ deformation additive manufacturing AlSi10Mg alloy heat treatment

Received: 23 April 2024

ZTFLH:

TB146.2

Fund: National Key Research and Development Program of China(2023YFA1609202);Beamtime at PETRA III for the Proposal(H-20010018)

Corresponding Authors: ZHANG Xingxing, associate professor, Tel: (010)88233581, E-mail: xxzhang@ihep.ac.cn

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	ZHANG Xingxing
	LUTZ Andreas
	GAN Weimin
	MAAWAD Emad
	KRIELE Armin

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https://www.ams.org.cn/EN/10.11900/0412.1961.2024.00116 OR https://www.ams.org.cn/EN/Y2024/V60/I8/1091

Fig.1 Sample dimensions for the in situ deformation experiment (unit: mm)
(a) as-printed sample
(b) stress-relieved annealed sample

Fig.2 Macroscopic behaviors of as-built and annealed samples
(a) engineering stress-strain curves
(b) hardening coefficient curves
(c) determination of uniform true strain

Fig.3 SEM images of microstructures of as-built (a-c) and annealed (d-f) samples
(a, d) microstructures at low magnification
(b, e) microstructures within the melt-pool
(c, f) microstructures on the melt-pool boundary

Fig.4 Evolutions of lattice strains of as-built (a, c) and annealed (b, d) samples (LD—loading direction, TD—transverse direction)
(a, b) Al matrix (c, d) Si phase

Table 1 Maximum lattice strain errors during whole deformation process

Fig.5 Evolutions of phase stresses of as-built (a, c) and annealed (b, d) samples
(a, b) Al matrix (c, d) Si phase

Fig.6 Dislocation density evolutions of Al matrix of as-built and annealed samples

Fig.7 Contributions of Al and Si phases to the strain hardening rate of the alloys (The data of alloys in Fig.2b was plotted here again for comparison)
(a) as-built sample (b) annealed sample

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