Metallurgical and mechanical characterization of stir cast AA6061-T6–AlNp composite

An attempt has been made to manufacture aluminium (6061-T6) matrix composites reinforced with aluminium nitride particles (AlNp) of size 3–4 μ using indigenously developed modified stir casting method with bottom pouring arrangement in controlled argon environment. To improve the wettability of AlNp with molten Al matrix, 2% Mg has been added. AA6061–AlNp composites have been successfully produced at different weight percentages (viz 0, 5, 10, 15 and 20) of AlNp and their metallurgical and mechanical properties have been analysed. Macrohardness, microhardness, Yield strength and ultimate tensile strength of the composite have improved with the addition of AlNp in the Al matrix. Optical and SEM micrographs reveal the homogeneous distribution of reinforcement particles in the matrix and X-ray diffraction patterns ensure the dispersion of AlNp reinforcement in AA6061 matrix.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► AA6061–AlNp composite is produced by modified stir casting process. ► Clustered AlN particles are distributed homogeneously in the AA6061 matrix. ► Clear interface is noticed between particle and matrix. ► Mechanical properties are increased by the addition of AlNp.