In this study, nano-sized SiC particles are added to AZ91 magnesium alloy using friction stir processing (FSP) and friction stir vibration processing (FSVP) to produce surface nano-composite layers. FSVP is a modified method of FSP in which the specimen is vibrated during FSP. The influence of FSP and FSVP pass numbers on mechanical and microstructural behaviors of the developed surfaces is investigated. It is indicated that nano-composite layers produced by FSVP have finer microstructures compared to those produced by FSP, and nano-sized particles are distributed more homogeneously. Furthermore, mechanical properties including hardness, scratch resistance, ductility, and strength of FSV processed specimens, were higher than those related to FS processed specimens. The results show a decline in the porosity content as the FSP passes are increased. Also, the compressive strength of the FSVP-ed composites is higher than those for the FSP-ed samples. It is also noticed that an increase in the vibration frequency during the FSVP process causes a more uniform dispersion of composite particles and thus, decreases particle clustering.

在这项研究中，使用搅拌摩擦加工 (FSP) 和摩擦搅拌振动加工 (FSVP) 将纳米尺寸的 SiC 颗粒添加到 AZ91 镁合金中，以产生表面纳米复合层。FSVP 是一种改进的 FSP 方法，其中试样在 FSP 期间振动。研究了 FSP 和 FSVP 道次数对开发表面的机械和微观结构行为的影响。结果表明，FSVP制备的纳米复合层与FSP制备的纳米复合层相比，具有更精细的微观结构，纳米颗粒分布更均匀。此外，FSV 加工试样的硬度、抗划伤性、延展性和强度等机械性能高于 FS 加工试样的相关机械性能。结果表明，随着 FSP 道次增加，孔隙率下降。此外，FSVP-ed 复合材料的抗压强度高于 FSP-ed 样品的抗压强度。还注意到在 FSVP 过程中振动频率的增加会导致复合颗粒更均匀的分散，从而减少颗粒聚集。