Subramani Murugan, Huang Song-Jeng, Borodianskiy Konstantin
Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan.
Department of Chemical Engineering, Ariel University, Ariel 40700, Israel.
Materials (Basel). 2022 Jan 28;15(3):1004. doi: 10.3390/ma15031004.
Magnesium alloys are attractive for the production of lightweight parts in modern automobile and aerospace industries due to their advanced properties. Their mechanical properties are usually enhanced by the incorporation with reinforcement particles. In the current study, reinforced AZ31 magnesium alloy was fabricated through the addition of bulk Al and the incorporation of SiC nanoparticles using a stir casting process to obtain AZ31-SiC nanocomposites. Scanning electron microscope (SEM) investigations revealed the formation of MgAl lamellar intermetallic structures and SiC clusters in the nanocomposites. Energy dispersive spectroscopy (EDS) detected the uniform distribution of SiC nanoparticles in the AZ31-SiC nanocomposites. Enhancements in hardness and yield strength (YS) were detected in the fabricated nanocomposites. This behavior was referred to a joint strengthening mechanisms which showed matrix-reinforcement coefficient of thermal expansion (CTE) and elastic modulus mismatches, Orowan strengthening, and load transfer mechanism. The mechanical properties and wear resistance were gradually increased with an increase in SiC content in the nanocomposite. The maximum values were obtained from nanocomposites containing 1 wt% of SiC (AZ31-1SiC). AZ31-1SiC nanocomposite YS and hardness were improved by 27% and 30%, respectively, compared to AZ31 alloy. This nanocomposite also exhibited the highest wear resistance; its wear mass loss and depth of the worn surface decreased by 26% and 15%, respectively, compared to AZ31 alloy.
由于其先进的性能，镁合金在现代汽车和航空航天工业中对于生产轻质部件具有吸引力。通过与增强颗粒结合，其机械性能通常会得到增强。在当前的研究中，通过添加块状铝并使用搅拌铸造工艺加入碳化硅纳米颗粒来制备增强型AZ31镁合金，以获得AZ31-SiC纳米复合材料。扫描电子显微镜（SEM）研究揭示了纳米复合材料中MgAl层状金属间化合物结构和SiC团簇的形成。能量色散光谱（EDS）检测到AZ31-SiC纳米复合材料中SiC纳米颗粒的均匀分布。在所制备的纳米复合材料中检测到硬度和屈服强度（YS）的提高。这种行为归因于联合强化机制，该机制表现出基体与增强体的热膨胀系数（CTE）和弹性模量不匹配、奥罗万强化以及载荷传递机制。随着纳米复合材料中SiC含量的增加，其机械性能和耐磨性逐渐提高。含有1 wt% SiC的纳米复合材料（AZ31-1SiC）获得了最大值。与AZ31合金相比，AZ31-1SiC纳米复合材料的YS和硬度分别提高了27%和30%。这种纳米复合材料还表现出最高的耐磨性；与AZ31合金相比，其磨损质量损失和磨损表面深度分别降低了26%和15%。
