The Effect of Silicon Phase Morphology on Microstructure and Properties of AlSi10Mg Alloys Fabricated by Selective Laser Melting |
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| Authors: | Liyun Wu Zhanyong Zhao Peikang Bai Zhen Zhang Yuxin Li Minjie Liang Wenbo Du |
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| Affiliation: | 1.Department of Mechanical Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China;2.School of Materials Science and Engineering, North University of China, Taiyuan 030051, China;3.College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030051, China;4.National Key Laboratory for Remanufacturing, Academy of Army Armored Forces, Beijing 100072, China |
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| Abstract: | This paper investigated the effect of silicon phase morphology and size on microstructure, mechanical properties, and corrosion resistance of the AlSi10Mg alloys fabricated by selective laser melting (SLM). Using different heat treatment conditions for SLM-fabricated alloys, the microstructure characteristics and mechanical properties are analyzed. The corrosion behavior analysis is also performed using potentiodynamic polarization, electrochemical and immersion tests. Results show that the AlSi10Mg alloy directly fabricated by SLM has a continuous eutectic silicon network, which has a small driving force for corrosion and facilitates the deposition of corrosion products and generates a dense protective film. On the contrary, the formation of large isolated and uniformly distributed silicon particles produces a greater corrosion driving force after heat treatment, which makes most of the corrosion products transfer to the solution. The corrosion resistance of AlSi10Mg alloy directly fabricated by SLM is better than that of the alloys with heat treatment. Moreover, the heat treatment reduces the hardness of AlSi10Mg alloys due to the decrease in the solid solution strengthening effect. |
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| Keywords: | selective laser melting AlSi10Mg microstructure mechanical properties corrosion performance |
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