Microstructure, defects, and mechanical properties of wire + arc additively manufactured AlCu4.3-Mg1.5 alloy
The wire with a composition of AlCu4.3%Mg1.5% was customized and used to deposit the WAAM alloy with the power source of cold metal transfer. The microstructure, defect, and mechanical properties of the as-deposited and heat-treated WAAM alloys were studied. Key findings demonstrated that the micr...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2020-01-01
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| Series: | Materials & Design |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127519307956 |
| _version_ | 1811266964434190336 |
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| author | Jianglong Gu Minjie Gao Shouliang Yang Jing Bai Yuchun Zhai Jialuo Ding |
| author_facet | Jianglong Gu Minjie Gao Shouliang Yang Jing Bai Yuchun Zhai Jialuo Ding |
| author_sort | Jianglong Gu |
| collection | DOAJ |
| description | The wire with a composition of AlCu4.3%Mg1.5% was customized and used to deposit the WAAM alloy with the power source of cold metal transfer. The microstructure, defect, and mechanical properties of the as-deposited and heat-treated WAAM alloys were studied. Key findings demonstrated that the microstructure of the as-deposited alloy was characterized by a hierarchical distribution of dendrites, equiaxed grains, and a slight number of columnar grains. The volume fraction of the network-like scattered coarse particles of second phases θ + S reduced by 95% after the T6 heat treatment. With an average microhardness of 161.4 HV, the mean yield strength and ultimate tensile strength of the WAAM alloy increased by 116% and 66% achieving 399 MPa and 485 MPa in the horizontal direction after heat treatment. The precipitation of a high density of needle-shaped metastable S′ precipitates was responsible for the significantly enhanced mechanical properties. However, this WAAM alloy has exhibited an anisotropic tensile property. A considerable number of sharp-angled defects like linear and chain-like micropores, which generally depress the mechanical properties, were formed in the WAAM alloys. Keywords: Wire + arc additive manufacturing, Al alloy, Al-Cu-Mg, Microstructure, Defect, Mechanical property |
| first_indexed | 2024-04-12T20:53:48Z |
| format | Article |
| id | doaj.art-b142e19b246c4ddf8bbac49c5e2f4735 |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-04-12T20:53:48Z |
| publishDate | 2020-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-b142e19b246c4ddf8bbac49c5e2f47352022-12-22T03:17:03ZengElsevierMaterials & Design0264-12752020-01-01186Microstructure, defects, and mechanical properties of wire + arc additively manufactured AlCu4.3-Mg1.5 alloyJianglong Gu0Minjie Gao1Shouliang Yang2Jing Bai3Yuchun Zhai4Jialuo Ding5State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, PR China; Hebei Key Laboratory for Optimizing Metal Product Technology and Performance, Yanshan University, Qinhuangdao 066004, PR ChinaState Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, PR ChinaState Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, PR ChinaSchool of Materials Science and Engineering, Northeastern University, Shenyang 110819, PR China; Corresponding author.School of Materials Science and Engineering, Northeastern University, Shenyang 110819, PR ChinaWelding Engineering and Laser Processing Centre, Cranfield University, Bedfordshire MK430AL, UKThe wire with a composition of AlCu4.3%Mg1.5% was customized and used to deposit the WAAM alloy with the power source of cold metal transfer. The microstructure, defect, and mechanical properties of the as-deposited and heat-treated WAAM alloys were studied. Key findings demonstrated that the microstructure of the as-deposited alloy was characterized by a hierarchical distribution of dendrites, equiaxed grains, and a slight number of columnar grains. The volume fraction of the network-like scattered coarse particles of second phases θ + S reduced by 95% after the T6 heat treatment. With an average microhardness of 161.4 HV, the mean yield strength and ultimate tensile strength of the WAAM alloy increased by 116% and 66% achieving 399 MPa and 485 MPa in the horizontal direction after heat treatment. The precipitation of a high density of needle-shaped metastable S′ precipitates was responsible for the significantly enhanced mechanical properties. However, this WAAM alloy has exhibited an anisotropic tensile property. A considerable number of sharp-angled defects like linear and chain-like micropores, which generally depress the mechanical properties, were formed in the WAAM alloys. Keywords: Wire + arc additive manufacturing, Al alloy, Al-Cu-Mg, Microstructure, Defect, Mechanical propertyhttp://www.sciencedirect.com/science/article/pii/S0264127519307956 |
| spellingShingle | Jianglong Gu Minjie Gao Shouliang Yang Jing Bai Yuchun Zhai Jialuo Ding Microstructure, defects, and mechanical properties of wire + arc additively manufactured AlCu4.3-Mg1.5 alloy Materials & Design |
| title | Microstructure, defects, and mechanical properties of wire + arc additively manufactured AlCu4.3-Mg1.5 alloy |
| title_full | Microstructure, defects, and mechanical properties of wire + arc additively manufactured AlCu4.3-Mg1.5 alloy |
| title_fullStr | Microstructure, defects, and mechanical properties of wire + arc additively manufactured AlCu4.3-Mg1.5 alloy |
| title_full_unstemmed | Microstructure, defects, and mechanical properties of wire + arc additively manufactured AlCu4.3-Mg1.5 alloy |
| title_short | Microstructure, defects, and mechanical properties of wire + arc additively manufactured AlCu4.3-Mg1.5 alloy |
| title_sort | microstructure defects and mechanical properties of wire arc additively manufactured alcu4 3 mg1 5 alloy |
| url | http://www.sciencedirect.com/science/article/pii/S0264127519307956 |
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