Effect of La and Sc Co-Addition on the Mechanical Properties and Thermal Conductivity of As-Cast Al-4.8% Cu Alloys
The effects of La and La+Sc addition on mechanical properties and thermal conductivity of Al-4.8Cu alloy were comprehensively studied. The as-cast samples were characterized by optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and first-principles methods. The resu...
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MDPI AG
2021-11-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/11/11/1866 |
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| author | Zhao-Xi Song Yuan-Dong Li Wen-Jing Liu Hao-Kun Yang Yang-Jing Cao Guang-Li Bi |
| author_facet | Zhao-Xi Song Yuan-Dong Li Wen-Jing Liu Hao-Kun Yang Yang-Jing Cao Guang-Li Bi |
| author_sort | Zhao-Xi Song |
| collection | DOAJ |
| description | The effects of La and La+Sc addition on mechanical properties and thermal conductivity of Al-4.8Cu alloy were comprehensively studied. The as-cast samples were characterized by optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and first-principles methods. The results reveal that the grain morphology of Al-4.8Cu alloy changes from dendrite to fine equiaxed grain with La, La+Sc addition. The average grain size of Al-Cu-La (Al-4.8Cu-0.4La) and Al-Cu-La-Sc (Al-4.8Cu-0.4La-0.4Sc) decreased by 37.2% (70.36 μm) and 63.3% (119.64 μm) respectively compared with Al-Cu (Al-4.8Cu). Al-Cu-La has the highest elongation among the three which is 34.4% (2.65%) higher than Al-Cu. Al-Cu-La-Sc has the highest ultimate tensile strength and yield strength which are 55.1% (80.9 MPa) and 65.2% (62.1 MPa) higher than Al-Cu, respectively. The thermal conductivity of Al-Cu-La and Al-Cu-La-Sc is 10.0% (18.797 W·m<sup>−1</sup>·k<sup>−1</sup>) and 6.5% (12.178 W·m<sup>−1</sup>·k<sup>−1</sup>) higher than Al-Cu alloy respectively. Compared with Al-Cu, Al-Cu-La has less shrinkage and porosity, the presence of Al<sub>4</sub>La and AlCu<sub>3</sub> contribute a lot to the decrease of specific heat capacity and the increase of plasticity and toughness. The porosity of Al-Cu-La-Sc does not significantly decrease compared with Al-Cu-La, the presence of Al<sub>3</sub>Sc and AlCuSc bring about the increase of specific heat capacity and brittleness. |
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| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T05:16:41Z |
| publishDate | 2021-11-01 |
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| spelling | doaj.art-568e3022e48e43a299bc4b7ee7b950072023-11-23T00:24:48ZengMDPI AGMetals2075-47012021-11-011111186610.3390/met11111866Effect of La and Sc Co-Addition on the Mechanical Properties and Thermal Conductivity of As-Cast Al-4.8% Cu AlloysZhao-Xi Song0Yuan-Dong Li1Wen-Jing Liu2Hao-Kun Yang3Yang-Jing Cao4Guang-Li Bi5State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, ChinaState Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, ChinaState Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, ChinaState Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, ChinaState Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, ChinaState Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, ChinaThe effects of La and La+Sc addition on mechanical properties and thermal conductivity of Al-4.8Cu alloy were comprehensively studied. The as-cast samples were characterized by optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and first-principles methods. The results reveal that the grain morphology of Al-4.8Cu alloy changes from dendrite to fine equiaxed grain with La, La+Sc addition. The average grain size of Al-Cu-La (Al-4.8Cu-0.4La) and Al-Cu-La-Sc (Al-4.8Cu-0.4La-0.4Sc) decreased by 37.2% (70.36 μm) and 63.3% (119.64 μm) respectively compared with Al-Cu (Al-4.8Cu). Al-Cu-La has the highest elongation among the three which is 34.4% (2.65%) higher than Al-Cu. Al-Cu-La-Sc has the highest ultimate tensile strength and yield strength which are 55.1% (80.9 MPa) and 65.2% (62.1 MPa) higher than Al-Cu, respectively. The thermal conductivity of Al-Cu-La and Al-Cu-La-Sc is 10.0% (18.797 W·m<sup>−1</sup>·k<sup>−1</sup>) and 6.5% (12.178 W·m<sup>−1</sup>·k<sup>−1</sup>) higher than Al-Cu alloy respectively. Compared with Al-Cu, Al-Cu-La has less shrinkage and porosity, the presence of Al<sub>4</sub>La and AlCu<sub>3</sub> contribute a lot to the decrease of specific heat capacity and the increase of plasticity and toughness. The porosity of Al-Cu-La-Sc does not significantly decrease compared with Al-Cu-La, the presence of Al<sub>3</sub>Sc and AlCuSc bring about the increase of specific heat capacity and brittleness.https://www.mdpi.com/2075-4701/11/11/1866Al-Cu alloymircrostructuremechanical propertiesthermal conductivityfirst-principles |
| spellingShingle | Zhao-Xi Song Yuan-Dong Li Wen-Jing Liu Hao-Kun Yang Yang-Jing Cao Guang-Li Bi Effect of La and Sc Co-Addition on the Mechanical Properties and Thermal Conductivity of As-Cast Al-4.8% Cu Alloys Metals Al-Cu alloy mircrostructure mechanical properties thermal conductivity first-principles |
| title | Effect of La and Sc Co-Addition on the Mechanical Properties and Thermal Conductivity of As-Cast Al-4.8% Cu Alloys |
| title_full | Effect of La and Sc Co-Addition on the Mechanical Properties and Thermal Conductivity of As-Cast Al-4.8% Cu Alloys |
| title_fullStr | Effect of La and Sc Co-Addition on the Mechanical Properties and Thermal Conductivity of As-Cast Al-4.8% Cu Alloys |
| title_full_unstemmed | Effect of La and Sc Co-Addition on the Mechanical Properties and Thermal Conductivity of As-Cast Al-4.8% Cu Alloys |
| title_short | Effect of La and Sc Co-Addition on the Mechanical Properties and Thermal Conductivity of As-Cast Al-4.8% Cu Alloys |
| title_sort | effect of la and sc co addition on the mechanical properties and thermal conductivity of as cast al 4 8 cu alloys |
| topic | Al-Cu alloy mircrostructure mechanical properties thermal conductivity first-principles |
| url | https://www.mdpi.com/2075-4701/11/11/1866 |
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