Achieving Superior Strength and Ductility of AlSi10Mg Alloy Fabricated by Selective Laser Melting with Large Laser Power and High Scanning Speed

Mei, Jiahe; Han, Ying; Zu, Guoqing; Zhu, Weiwei; Zhao, Yu; Chen, Hua; Xu, Rongqing

doi:10.1007/s40195-022-01410-w

Cited by 16 publications

(4 citation statements)

References 32 publications

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“…With the advancement of high-end manufacturing and the pursuit of rapid prototyping, Al-Si alloy materials have demonstrated remarkable performances in laser powder bed fusion technology [5]. Mei et al [6] achieved extremely fine microstructures and excellent mechanical properties in an AlSi 10 Mg alloy manufactured via PBF-LB/M technology. Prashanth et al [7] observed a refined eutectic silicon cellular structure in PBF-LB/M Al-12Si, which significantly increased the material's yield strength and tensile strength, respectively, four times and twice as high as conventional cast materials.…”

Section: Introductionmentioning

confidence: 99%

Solidification Mechanism of Microstructure of Al-Si-Cu-Ni Alloy Manufactured by Laser Powder Bed Fusion and Mechanical Properties Effect

Shi,

Yan,

Yan

2024

Metals

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Based on previous work, where Al-Si-Cu-Ni alloy was successfully manufactured by laser powder bed fusion (PBF-LB/M) technology, in this study, we further observe the microstructure of the alloy, analyze the formation mechanism of the microstructure during solidification, and discuss their implications for the mechanical properties. The results indicate that the microstructure comprises multi-level cellular heterogeneous structures, with an α-Al matrix in the interior of the cellular structure and Cu- and Ni-rich phases clustered at the boundaries, intertwined with the silicon network. During solidification, α-Al solidifies first and occupies the core of the cells, while Si phases and Cu- and Ni-rich phases deposit along the cellular boundaries under the influence of surface tension. During the solidification process of cellular boundaries, influenced by spinodal decomposition and lattice spacing, Si phases and Cu- and Ni-rich phases interconnect and distribute crosswise, collectively forming multi-level cellular structures. The refined cellular microstructure of the PBF-LB/M Al-Si-Cu-Ni alloy enhances the mechanical properties of the alloy. The alloy exhibits a bending strength of 766 ± 30 MPa, a tensile strength and yield strength of 437 ± 6 MPa and 344 ± 4 MPa, respectively, with a relatively low fracture elongation of approximately 1.51 ± 0.07%. Subsequent improvement can be achieved through appropriate heat treatment processes.

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Section: Introductionmentioning

confidence: 99%

Solidification Mechanism of Microstructure of Al-Si-Cu-Ni Alloy Manufactured by Laser Powder Bed Fusion and Mechanical Properties Effect

Shi,

Yan,

Yan

2024

Metals

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“…For instance, 0.2~0.4 wt.% Mg content may enhance the strength of alloys through precipitation hardening due to the precipitation of the fine Mg 2 Si phase during the aging heat treatment or the AM process [9,11,13] . Furthermore, the specific process parameters of the SLM process significantly affect the alloy properties, including laser power [14][15][16] , scanning speed [16,17] , powder layer thickness [15] , scanning spacing [18,19] , build direction [20][21][22] , scanning strategy [23,24] , and post heat-treatment processes [13,11,20] . Though a number of experimental investigations have been devoted to different SLMed Al-Si-(Mg) alloys in the literature, the factors that affect the properties and performance of alloys are too many, and thus there is still no systematic study on the relation among the "composition-process-properties" of the SLMed Al-Si-(Mg) alloys.…”

Section: Introductionmentioning

confidence: 99%

Development of an accurate “composition-process-properties” dataset for SLMed Al-Si-(Mg) alloys and its application in alloy design

Gao¹,

Gao²,

Zhang³

et al. 2023

J Mater Inf

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Al-Si-Mg series alloys are the most common alloys available for additive manufacturing forming with low cracking tendency. However, there is no systematic study on the computational design of SLMed Al-Si-(Mg) alloys due to the huge parameter space of composition and processes. In this paper, a high-quality dataset of SLMed Al-Si-(Mg) alloys containing 176 pieces of data from 50 publications was first established, which recorded the information, including alloy compositions, process parameters, test conditions, and mechanical properties. A threshold value of 35 J/mm3 for energy density (Ed) was then proposed as a criterion to clean the data points with lower ultimate tensile strength (UTS) and elongation (EL). The cleaned dataset consists of a first training/testing dataset with 142 data for model construction and a second testing dataset with 9 data for model verification. After that, four machine learning models were applied to establish the quantitative relation of “composition-processes-properties” in SLMed Al-Si-(Mg) alloys. The MLPReg model was chosen as the optimal one considering its best performance and subsequently utilized to design novel compositions and process parameters for SLMed Al-Si-(Mg) alloys. The UTS and EL of the designed alloy with a maximum comprehensive mechanical property are 549 MPa and 16%, both of which are higher than all the available experimental data. It is anticipated that the present design strategy based on the machine learning method should generally be applicable to other SLMed alloy systems.

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“…The current commercially available AlSi10Mg AM alloy is highly recyclable, as it does not have any minor alloying elements to promote grain refinement (GF). However, the strength is moderate, with R p0.2 in the range of 300 MPa [6,7] and its use is therefore limited. To reach a higher strength in the AlSiMg alloy system, the level of Mg is required to increase, as this will enable higher solid solution hardening and/or precipitation hardening.…”

Section: Introductionmentioning

confidence: 99%

High-Throughput Printability Screening of AlMgSi Alloys for Powder Bed Fusion

Leijon

Moverare

2023

Metals

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The importance of both recycling and additive manufacturing (AM) is increasing; however, there has been a limited focus on the development of AM alloys that are compatible in terms of recyclability with the larger scrap loops of wrought 5xxx, 6xxx and cast 3xx aluminium alloys. In this work, the powder bed fusion (PBF) printability of AlMgSi alloys in the interval of 0–30 wt% Mg and 0–4 wt% Si is screened experimentally with a high-throughput method. This method produces PBF-mimicked material by PVD co-sputtering, followed by laser remelting. Strong evidence was found for AlMgSi alloys being printable within two different composition ranges: Si + Mg < 0.7 wt% or for Si + 2/3 Mg > 4 wt% when Mg < 3 wt% and Si > 3 wt%. Increasing the amount of Mg and Si influences the grain structure by introducing fine columnar grains at the melt pool boundary, although the melt pool interior was unaffected. Hardness in an as-built state increased with both Mg and Si, although Si had a neglectable effect at low levels of Mg. Both the evaporative loss of Mg and the amount of Mg in solid solution increased linearly with the amount of Mg.

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Achieving Superior Strength and Ductility of AlSi10Mg Alloy Fabricated by Selective Laser Melting with Large Laser Power and High Scanning Speed

Cited by 16 publications

References 32 publications

Solidification Mechanism of Microstructure of Al-Si-Cu-Ni Alloy Manufactured by Laser Powder Bed Fusion and Mechanical Properties Effect

Solidification Mechanism of Microstructure of Al-Si-Cu-Ni Alloy Manufactured by Laser Powder Bed Fusion and Mechanical Properties Effect

Development of an accurate “composition-process-properties” dataset for SLMed Al-Si-(Mg) alloys and its application in alloy design

High-Throughput Printability Screening of AlMgSi Alloys for Powder Bed Fusion

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