Zhang Fuxu, Zhang Zhenyu, Gu Qinming, Hou Xuezhang, Meng Fanning, Zhuang Xuye, Li Li, Liu Bingxin, Feng Junyuan
Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education, School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, China.
School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China.
Materials (Basel). 2023 Jan 31;16(3):1222. doi: 10.3390/ma16031222.
AlSi10Mg has a good forming ability and has been widely accepted as an optimal material for selective laser melting (SLM). However, the strength and elongation of unmodified AlSi10Mg are insufficient, which limits its application in the space industry. In this paper, yttrium oxide (YO) nanoparticles modified AlSi10Mg composites that were manufactured using SLM. The effects of YO nanoparticles (0~2 wt.% addition) on the microstructure and mechanical properties of AlSi10Mg alloys were investigated. An ultimate tensile strength of 500.3 MPa, a yield strength of 322.3 MPa, an elongation of 9.7%, a good friction coefficient of 0.43, and a wear rate of (3.40 ± 0.09) ×10 mm·N·m were obtained with the addition of 0.5 wt.% YO nanoparticles, and all these parameters were higher than those of the SLMed AlSi10Mg alloy. The microhardness of the composite with 1.0 wt.% YO reached 145.6 HV, which is an increase of approximately 22% compared to the unreinforced AlSi10Mg. The improvement of tensile properties can mainly be attributed to Orowan strengthening, fine grain strengthening, and load-bearing strengthening. The results show that adding an appropriate amount of YO nanoparticles can significantly improve the properties of the SLMed AlSi10Mg alloy.
AlSi10Mg具有良好的成型能力，已被广泛公认为选择性激光熔化（SLM）的理想材料。然而，未改性的AlSi10Mg的强度和伸长率不足，这限制了其在航天工业中的应用。本文采用SLM制造了氧化钇（YO）纳米颗粒改性的AlSi10Mg复合材料。研究了YO纳米颗粒（添加量为0~2 wt.%）对AlSi10Mg合金微观结构和力学性能的影响。添加0.5 wt.%的YO纳米颗粒时，获得了500.3 MPa的极限抗拉强度、322.3 MPa的屈服强度、9.7%的伸长率、0.43的良好摩擦系数以及(3.40±0.09)×10 mm·N·m的磨损率，所有这些参数均高于SLM制备的AlSi10Mg合金。添加1.0 wt.% YO的复合材料的显微硬度达到145.6 HV，与未增强的AlSi10Mg相比提高了约22%。拉伸性能的提高主要归因于奥罗万强化、细晶强化和承载强化。结果表明，添加适量的YO纳米颗粒可以显著改善SLM制备的AlSi10Mg合金的性能。
