Enhancement of Microstructure and Mechanical Property of AlSi10Mg-Er-Zr Alloys Fabricated by Selective Laser Melting

doi:10.11900/0412.1961.2021.00085

Acta Metall Sin

2022, Vol. 58

Issue (9): 1108-1117 DOI: 10.11900/0412.1961.2021.00085

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Enhancement of Microstructure and Mechanical Property of AlSi10Mg-Er-Zr Alloys Fabricated by Selective Laser Melting

YANG Tianye, CUI Li(

), HE Dingyong, HUANG Hui

Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China

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Abstract

The AlSi10Mg alloy fabricated using selective laser melting (SLM) has attracted attention because of its excellent quality and properties. However, the mechanical properties of SLM AlSi10Mg alloy cannot meet the requirements of the high strength of aluminum alloys in the aerospace industry. To improve the mechanical properties of SLM AlSi10Mg alloy, AlSi10Mg-Er-Zr powders were prepared using in situ alloying mechanism and gas atomization. The relative density, microstructure, and mechanical properties of SLM AlSi10Mg-Er-Zr alloys have been investigated. The results show that the relative density of AlSi10Mg-Er-Zr alloys fabricated using SLM reaches 99.20%. The SLM AlSi10Mg-Er-Zr alloy has a microhardness value of 156.5 HV. The ultimate tensile strength (UTS) and yield strength (YS) of the SLM AlSi10Mg-Er-Zr alloy can reach 461 and 304 MPa, respectively. Compared with the conventional AlSi10Mg alloy, the microhardness has been increased by 25.8%; the UTS and YS are increased by 22.6% and 26.7%, respectively. The fine-grain and solid solution strengthening associated with SLM processing with the addition of Er and Zr elements, as a result of increased grain size refinement and solid solubility of Si element in the α-Al matrix, are responsible for the improvement in the mechanical properties.

Key words: selective laser melting AlSi10Mg-Er-Zr alloy rare earth element microstructure mechanical property

Received: 26 February 2021

ZTFLH:

TG146.2

Fund: National Natural Science Foundation of China(51621003)

Corresponding Authors: CUI Li E-mail: cuili@bjut.edu.cn

About author: CUI Li, professor, Tel: 13311267636, E-mail: cuili@bjut.edu.cn

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Cite this article:

YANG Tianye, CUI Li, HE Dingyong, HUANG Hui. Enhancement of Microstructure and Mechanical Property of AlSi10Mg-Er-Zr Alloys Fabricated by Selective Laser Melting. Acta Metall Sin, 2022, 58(9): 1108-1117.

URL:

https://www.ams.org.cn/EN/10.11900/0412.1961.2021.00085 OR https://www.ams.org.cn/EN/Y2022/V58/I9/1108

Table 1 Chemical compositions of AlSi10Mg-Er-Zr and AlSi10Mg alloy powders

Fig.1 Relationship between the relative density and the laser energy density of AlSi10Mg-Er-Zr sample

Fig.2 Macrostructures of AlSi10Mg-Er-Zr sample fabricated by selective laser melting (SLM)
(a) three dimension macrostructure (b) X-Y plane (c) X-Z plane (d) Y-Z plane

Fig.3 SEM images of AlSi10Mg-Er-Zr (a) and AlSi10Mg (b) samples fabricated by SLM

Fig.4 XRD spectra of AlSi10Mg-Er-Zr and AlSi10Mg samples fabricated by SLM

Table 2 Mechanical properties of AlSi10Mg-Er-Zr and AlSi10Mg samples fabricated by SLM

Fig.5 Inverse pole figure maps of AlSi10Mg-Er-Zr (a) and AlSi10Mg (b) samples fabricated by SLM and grains size distribution of SLM sample (c)

Fig.6 TEM image and HRTEM images of AlSi10Mg-Er-Zr sample fabricated by SLM
(a) TEM image of AlSi10Mg-Er-Zr sample
(b) HRTEM image and fast fourier transform (inset) of Al₃(Er, Zr) phase
(c) HRTEM image and fast fourier transform (inset) of Mg₂Si phase

Fig.7 High magnification SEM images and EDS results (mass fraction) of AlSi10Mg-Er-Zr (a) and AlSi10Mg (b) samples fabricated by SLM

Fig.8 Alloying element distributions of AlSi10Mg-Er-Zr sample fabricated by SLM
(a) high angle annular dark field (HAADF) image of area scanning region (b) element distribution map
(c) Al element (d) Si element (e) Mg element (f) Er element (g) Zr element

Fig.9 Schmid factor distribution maps of AlSi10Mg-Er-Zr (a) and AlSi10Mg (b) samples fabricated by SLM

Fig.10 Texture component distribution mapping of AlSi10Mg-Er-Zr (a) and AlSi10Mg (b) samples

Table 3 Texture contents of AlSi10Mg-Er-Zr and AlSi10Mg samples fabricated by SLM

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