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Enhancement of Microstructure and Mechanical Property of AlSi10Mg-Er-Zr Alloys Fabricated by Selective Laser Melting |
YANG Tianye, CUI Li( ), HE Dingyong, HUANG Hui |
Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China |
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Abstract The AlSi10Mg alloy fabricated using selective laser melting (SLM) has attracted attention because of its excellent quality and properties. However, the mechanical properties of SLM AlSi10Mg alloy cannot meet the requirements of the high strength of aluminum alloys in the aerospace industry. To improve the mechanical properties of SLM AlSi10Mg alloy, AlSi10Mg-Er-Zr powders were prepared using in situ alloying mechanism and gas atomization. The relative density, microstructure, and mechanical properties of SLM AlSi10Mg-Er-Zr alloys have been investigated. The results show that the relative density of AlSi10Mg-Er-Zr alloys fabricated using SLM reaches 99.20%. The SLM AlSi10Mg-Er-Zr alloy has a microhardness value of 156.5 HV. The ultimate tensile strength (UTS) and yield strength (YS) of the SLM AlSi10Mg-Er-Zr alloy can reach 461 and 304 MPa, respectively. Compared with the conventional AlSi10Mg alloy, the microhardness has been increased by 25.8%; the UTS and YS are increased by 22.6% and 26.7%, respectively. The fine-grain and solid solution strengthening associated with SLM processing with the addition of Er and Zr elements, as a result of increased grain size refinement and solid solubility of Si element in the α-Al matrix, are responsible for the improvement in the mechanical properties.
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Received: 26 February 2021
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Fund: National Natural Science Foundation of China(51621003) |
Corresponding Authors:
CUI Li
E-mail: cuili@bjut.edu.cn
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About author: CUI Li, professor, Tel: 13311267636, E-mail: cuili@bjut.edu.cn
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