A Tailored AlSiMg Alloy for Laser Powder Bed Fusion
The majority of aluminum alloys used for laser powder bed fusion are based on the aluminum–silicon system, particularly alloys containing 7 to 12 wt.% silicon and less than 1 wt.% magnesium. Silicon has a beneficial influence on melt viscosity during casting and laser additive manufacturing and prev...
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MDPI AG
2020-04-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/10/4/514 |
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| author | Daniel Knoop Andreas Lutz Bernhard Mais Axel von Hehl |
| author_facet | Daniel Knoop Andreas Lutz Bernhard Mais Axel von Hehl |
| author_sort | Daniel Knoop |
| collection | DOAJ |
| description | The majority of aluminum alloys used for laser powder bed fusion are based on the aluminum–silicon system, particularly alloys containing 7 to 12 wt.% silicon and less than 1 wt.% magnesium. Silicon has a beneficial influence on melt viscosity during casting and laser additive manufacturing and prevents the formation of cracks. This study focused on the development of a new AlSi3.5Mg2.5 alloy for laser powder bed fusion with a Mg-Si content above 1.85 wt.% Mg<sub>2</sub>Si, which is the solubility limit of the α-aluminum matrix, and a subsequent heat treatment to adjust the mechanical properties with a wide range of strength and ductility values. The characterization of the microstructure was conducted by optical microscopy, scanning electron microscopy, transmission electron microscopy, and differential scanning calorimetry. The mechanical properties were determined by tensile tests and additional tight radius bending tests. The newly developed alloy was compared with AlSi10Mg and Scalmalloy<sup>®</sup>. AlSi3.5Mg2.5 offers higher strength and ductility than AlSi10Mg, at comparable material costs. The mechanical properties can be adjusted in a wide range of values using a single step heat treatment. After direct ageing, the samples exhibited a ultimate tensile strength (UTS) of 484 ± 1 MPa and an elongation at break of 10.5% ± 1.3%, while after soft annealing, they exhibited a UTS of 179 ± 2 MPa and an elongation at break of 25.6% ± 0.9%. |
| first_indexed | 2024-03-10T20:26:14Z |
| format | Article |
| id | doaj.art-7f2dd2d25b40460b9fad0ea02ef93092 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T20:26:14Z |
| publishDate | 2020-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-7f2dd2d25b40460b9fad0ea02ef930922023-11-19T21:45:47ZengMDPI AGMetals2075-47012020-04-0110451410.3390/met10040514A Tailored AlSiMg Alloy for Laser Powder Bed FusionDaniel Knoop0Andreas Lutz1Bernhard Mais2Axel von Hehl3Leibniz-Institute for Materials Engineering, 28359 Bremen, GermanyMercedes-Benz AG, 70372 Stuttgart, GermanyEcka Granules Germany GmbH, 91235 Velden, GermanyLeibniz-Institute for Materials Engineering, 28359 Bremen, GermanyThe majority of aluminum alloys used for laser powder bed fusion are based on the aluminum–silicon system, particularly alloys containing 7 to 12 wt.% silicon and less than 1 wt.% magnesium. Silicon has a beneficial influence on melt viscosity during casting and laser additive manufacturing and prevents the formation of cracks. This study focused on the development of a new AlSi3.5Mg2.5 alloy for laser powder bed fusion with a Mg-Si content above 1.85 wt.% Mg<sub>2</sub>Si, which is the solubility limit of the α-aluminum matrix, and a subsequent heat treatment to adjust the mechanical properties with a wide range of strength and ductility values. The characterization of the microstructure was conducted by optical microscopy, scanning electron microscopy, transmission electron microscopy, and differential scanning calorimetry. The mechanical properties were determined by tensile tests and additional tight radius bending tests. The newly developed alloy was compared with AlSi10Mg and Scalmalloy<sup>®</sup>. AlSi3.5Mg2.5 offers higher strength and ductility than AlSi10Mg, at comparable material costs. The mechanical properties can be adjusted in a wide range of values using a single step heat treatment. After direct ageing, the samples exhibited a ultimate tensile strength (UTS) of 484 ± 1 MPa and an elongation at break of 10.5% ± 1.3%, while after soft annealing, they exhibited a UTS of 179 ± 2 MPa and an elongation at break of 25.6% ± 0.9%.https://www.mdpi.com/2075-4701/10/4/514selective laser meltinglaser additive manufacturinglaser powder bed fusionaluminumheat treatmentAlSiMg |
| spellingShingle | Daniel Knoop Andreas Lutz Bernhard Mais Axel von Hehl A Tailored AlSiMg Alloy for Laser Powder Bed Fusion Metals selective laser melting laser additive manufacturing laser powder bed fusion aluminum heat treatment AlSiMg |
| title | A Tailored AlSiMg Alloy for Laser Powder Bed Fusion |
| title_full | A Tailored AlSiMg Alloy for Laser Powder Bed Fusion |
| title_fullStr | A Tailored AlSiMg Alloy for Laser Powder Bed Fusion |
| title_full_unstemmed | A Tailored AlSiMg Alloy for Laser Powder Bed Fusion |
| title_short | A Tailored AlSiMg Alloy for Laser Powder Bed Fusion |
| title_sort | tailored alsimg alloy for laser powder bed fusion |
| topic | selective laser melting laser additive manufacturing laser powder bed fusion aluminum heat treatment AlSiMg |
| url | https://www.mdpi.com/2075-4701/10/4/514 |
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