Wu Liyun, Zhao Zhanyong, Bai Peikang, Zhang Zhen, Li Yuxin, Liang Minjie, Du Wenbo
Department of Mechanical Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China.
School of Materials Science and Engineering, North University of China, Taiyuan 030051, China.
Materials (Basel). 2022 Dec 9;15(24):8786. doi: 10.3390/ma15248786.
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.
本文研究了硅相形态和尺寸对通过选择性激光熔化（SLM）制备的AlSi10Mg合金的微观结构、力学性能和耐腐蚀性的影响。对SLM制备的合金采用不同的热处理条件，分析了其微观结构特征和力学性能。还通过动电位极化、电化学和浸泡试验进行了腐蚀行为分析。结果表明，通过SLM直接制备的AlSi10Mg合金具有连续的共晶硅网络，其腐蚀驱动力小，有利于腐蚀产物的沉积并生成致密的保护膜。相反，大尺寸孤立且均匀分布的硅颗粒的形成在热处理后产生更大的腐蚀驱动力，这使得大部分腐蚀产物转移到溶液中。通过SLM直接制备的AlSi10Mg合金的耐腐蚀性优于经过热处理的合金。此外，由于固溶强化效果的降低，热处理降低了AlSi10Mg合金的硬度。
