The life span of many engineering components depends upon their surface properties. The improved surface properties of the materials are essential for enhancing the mechanical and tribological performance of the material. In many applications, the components required only improved surface properties without changing the entire volume properties of the material. The friction stir process (FSP) is a novel processing technique for the fabrication of such surface composites. In the present investigation, the surface composites were fabricated by incorporating molybdenum disulfide ( MoS2) and graphite (Gr) as reinforcement on the surface of aluminum alloy (Al 1120) through the friction stir process (FSP) at tool rotational speed of 1400 rpm and tool feed rate of 40 mm/min process parameters using square profile FSP tool. The tribological behaviors of fabricated surface composites were calculated by using a pin on disk tribometer. It was observed that the wear resistance of surface composites improved as compared to the matrix material.

    Abstract
    1 Introduction
    2 Materials and methods
        2.1 Matrix material
        2.2 Reinforcement materials
        2.3 Surface composites fabrication
    3 Results and discussion
        3.1 Microstructure characterization
        3.2 Hardness
        3.3 Tribological properties
    4 Conclusions
    References

• Manoj Kumar Gupta(Mechanical Engineering Department, H.N.B Garhwal University)