Microstructure and Mechanical Properties of a Combination Interface between Direct Energy Deposition and Selective Laser Melted Al-Mg-Sc-Zr Alloy
Selective laser melting (SLM) and direct energy deposition (DED) are two widely used technologies in additive manufacturing (AM). However, there are few studies on the combination of the two technologies, which can synthetically combine the advantages of the two technologies for more flexible materi...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-05-01
|
| Series: | Metals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4701/11/5/801 |
| _version_ | 1797534067843923968 |
|---|---|
| author | Cao Deng Ruidi Li Tiechui Yuan Pengda Niu Yin Wang |
| author_facet | Cao Deng Ruidi Li Tiechui Yuan Pengda Niu Yin Wang |
| author_sort | Cao Deng |
| collection | DOAJ |
| description | Selective laser melting (SLM) and direct energy deposition (DED) are two widely used technologies in additive manufacturing (AM). However, there are few studies on the combination of the two technologies, which can synthetically combine the advantages of the two technologies for more flexible material design. This paper systematically studies the Al-Mg-Sc-Zr alloy by combination of SLM and DED with emphasis on its bonding properties, microstructure, and metallurgical defects. It is found that the aluminum alloy prepared by the two methods achieves a good metallurgical combination. The microstructure of aluminum alloy prepared by DED is composed of equiaxed crystals, and there are a large number of Al<sub>3</sub>(Sc, Zr) precipitated phase particles rich in Sc and Zr. The microstructure of SLM aluminum alloy is composed of equiaxed crystals and columnar crystals, and there is a fine-grained area at the boundary of the molten pool. With the decrease of laser volumetric energy density (VED), the width and depth of the molten pool at the interface junction gradually decrease. The porosity gradually increases with the decrease of VED, and the microhardness shows a downward trend. Tensile strength and elongation at fracture of the SLM printed sample at 133.3 J/mm<sup>3</sup> are about 400 MPa and 9.4%, while the direct energy depositioned sample are about 280 MPa and 5.9%. Due to the excellent bonding performance, this research has certain guiding significance for SLM–DED composite aluminum alloy. |
| first_indexed | 2024-03-10T11:24:23Z |
| format | Article |
| id | doaj.art-e440338ef8eb4685beca4e40bf7b5be3 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T11:24:23Z |
| publishDate | 2021-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-e440338ef8eb4685beca4e40bf7b5be32023-11-21T19:48:51ZengMDPI AGMetals2075-47012021-05-0111580110.3390/met11050801Microstructure and Mechanical Properties of a Combination Interface between Direct Energy Deposition and Selective Laser Melted Al-Mg-Sc-Zr AlloyCao Deng0Ruidi Li1Tiechui Yuan2Pengda Niu3Yin Wang4State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, ChinaState Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, ChinaState Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, ChinaState Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, ChinaState Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, ChinaSelective laser melting (SLM) and direct energy deposition (DED) are two widely used technologies in additive manufacturing (AM). However, there are few studies on the combination of the two technologies, which can synthetically combine the advantages of the two technologies for more flexible material design. This paper systematically studies the Al-Mg-Sc-Zr alloy by combination of SLM and DED with emphasis on its bonding properties, microstructure, and metallurgical defects. It is found that the aluminum alloy prepared by the two methods achieves a good metallurgical combination. The microstructure of aluminum alloy prepared by DED is composed of equiaxed crystals, and there are a large number of Al<sub>3</sub>(Sc, Zr) precipitated phase particles rich in Sc and Zr. The microstructure of SLM aluminum alloy is composed of equiaxed crystals and columnar crystals, and there is a fine-grained area at the boundary of the molten pool. With the decrease of laser volumetric energy density (VED), the width and depth of the molten pool at the interface junction gradually decrease. The porosity gradually increases with the decrease of VED, and the microhardness shows a downward trend. Tensile strength and elongation at fracture of the SLM printed sample at 133.3 J/mm<sup>3</sup> are about 400 MPa and 9.4%, while the direct energy depositioned sample are about 280 MPa and 5.9%. Due to the excellent bonding performance, this research has certain guiding significance for SLM–DED composite aluminum alloy.https://www.mdpi.com/2075-4701/11/5/801direct energy depositionselective laser meltingAl-Mg-Sc-Zr alloyinterfacemicrostructuremechanical property |
| spellingShingle | Cao Deng Ruidi Li Tiechui Yuan Pengda Niu Yin Wang Microstructure and Mechanical Properties of a Combination Interface between Direct Energy Deposition and Selective Laser Melted Al-Mg-Sc-Zr Alloy Metals direct energy deposition selective laser melting Al-Mg-Sc-Zr alloy interface microstructure mechanical property |
| title | Microstructure and Mechanical Properties of a Combination Interface between Direct Energy Deposition and Selective Laser Melted Al-Mg-Sc-Zr Alloy |
| title_full | Microstructure and Mechanical Properties of a Combination Interface between Direct Energy Deposition and Selective Laser Melted Al-Mg-Sc-Zr Alloy |
| title_fullStr | Microstructure and Mechanical Properties of a Combination Interface between Direct Energy Deposition and Selective Laser Melted Al-Mg-Sc-Zr Alloy |
| title_full_unstemmed | Microstructure and Mechanical Properties of a Combination Interface between Direct Energy Deposition and Selective Laser Melted Al-Mg-Sc-Zr Alloy |
| title_short | Microstructure and Mechanical Properties of a Combination Interface between Direct Energy Deposition and Selective Laser Melted Al-Mg-Sc-Zr Alloy |
| title_sort | microstructure and mechanical properties of a combination interface between direct energy deposition and selective laser melted al mg sc zr alloy |
| topic | direct energy deposition selective laser melting Al-Mg-Sc-Zr alloy interface microstructure mechanical property |
| url | https://www.mdpi.com/2075-4701/11/5/801 |
| work_keys_str_mv | AT caodeng microstructureandmechanicalpropertiesofacombinationinterfacebetweendirectenergydepositionandselectivelasermeltedalmgsczralloy AT ruidili microstructureandmechanicalpropertiesofacombinationinterfacebetweendirectenergydepositionandselectivelasermeltedalmgsczralloy AT tiechuiyuan microstructureandmechanicalpropertiesofacombinationinterfacebetweendirectenergydepositionandselectivelasermeltedalmgsczralloy AT pengdaniu microstructureandmechanicalpropertiesofacombinationinterfacebetweendirectenergydepositionandselectivelasermeltedalmgsczralloy AT yinwang microstructureandmechanicalpropertiesofacombinationinterfacebetweendirectenergydepositionandselectivelasermeltedalmgsczralloy |