Microstructural Investigation Of GYP/Al Surface Composites Fabricated By friction Stir Processing

摘要

Strengthening the mechanical properties of AA 1100 is important especially for its possible application in bone tissue engineering (BTE). Gypsum is a non-ferrous material already used in the fabrication of scaffolds needed in BTE. A composite emanating from these two materials may provide a mechanically and biocompatible viable option to gypsum (GYP) alone in the fabrication of BTE components. In this study, surface composites with gypsum powder particles as reinforcement in AA 1100 matrix were developed by means of friction stir processing (FS P). Surface analysis of the composite showed well-distributed gypsum particles in the matrix. The average surface roughness measured (Ra = 1.97 μm) is comparable to those found in literature for similar application. The hardness acquired via a Vickers hardness machine showed an improvement (Up to 36.62HV) when compared to as received AA 1100 without reinforcement (23HV). The determined coefficient of friction (COF) for 1 and 10 N were, 1.048 and 0.838 respectively which are sufficiently high and seen as an indication of the roughness of the surface composite. It is found that gypsum powder particles bound well in the AA 1100 matrix.