Stir casting process is a prominent technique for the fabrication of aluminium matrix composites (AlMMCs). Regular feeding, two-step feeding, capsulate feeding, pre-melt feeding and double-layer feeding are different feeding methods used in stir casting technique. In this study, Al7075-MMCs reinforced with nano-sized Al₂O₃ are manufactured through five different feeding methods. The bonding between the matrix and ceramic interface, agglomeration of the particles and porosity are evaluated through scanning electron microscope. From the micro-structural characterization results, it is observed that double-layer feeding method ensures the better particle distribution and improved bonding between the Al7075 and Al₂O₃. Alumina particles of 50 nm size, 2.5 wt% are incorporated to the Al7075 matrix. The intensive porosity and high agglomeration are noticed in other methods. It is understood from the results that double-layer feeding technique is a promising route for producing the defect-free Al7075-MMCs. The density, micro-hardness, and tensile strength of the resultant composites are measured according to ASTM standards. Due to homogenous particle distribution, the ultimate tensile strength is increased from 280 to 387 MPa, which is 38% higher than Al7075. The yield strength of the composite is increased from 140 to 198 MPa. The micro-hardness is increased from 661 to 878 MPa.

搅拌铸造工艺是制造铝基复合材料（AlMMCs）的一项重要技术。常规浇铸，两步浇铸，胶囊浇铸，预熔融浇铸和双层浇铸是搅拌铸造技术中使用的不同浇铸方法。在这项研究中，通过五种不同的进料方法制造了用纳米级Al ₂ O ₃增强的Al7075-MMC 。通过扫描电子显微镜评估基体和陶瓷界面之间的键合，颗粒的团聚和孔隙率。从微观结构表征结果可以看出，双层进料方法可确保更好的颗粒分布并改善Al7075与Al ₂ O ₃之间的键合。将50nm尺寸，2.5wt％的氧化铝颗粒结合到Al7075基体中。在其他方法中也注意到了高孔隙率和高附聚性。从结果可以理解，双层进料技术是生产无缺陷Al7075-MMCs的有前途的途径。所得复合材料的密度，显微硬度和拉伸强度根据ASTM标准进行测量。由于颗粒分布均匀，极限抗拉强度从280 MPa增加到387 MPa，比Al7075高38％。复合材料的屈服强度从140 MPa增加到198 MPa。显微硬度从661 MPa增加到878 MPa。