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
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.
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.
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
Sample
UTS
YS
Hardness
MPa
MPa
HV
AlSi10Mg-Er-Zr
461 ± 4
304 ± 3
156 ± 7
AlSi10Mg
376 ± 4
240 ± 3
124 ± 5
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
Sample
Cube
Goss
R
P
Shear
Brass
Copper
S
AlSi10Mg-Er-Zr
2.81
1.23
7.13
5.63
3.53
3.41
3.63
1.08
AlSi10Mg
11.70
3.01
7.62
1.40
6.10
6.41
2.33
1.83
Table 3 Texture contents of AlSi10Mg-Er-Zr and AlSi10Mg samples fabricated by SLM
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