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Xue Na,Liu Wenqing,Zhu Liu,T. Muthuramalingam 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.12
In the present scenario, it is much needed of developing Al–Sc and Al–Sc–Zr alloys owing to its higher strength to weightfor aerospace applications. The present study is dealt about effect of Scandium on micro hardness and micro structure ofsynthesized Al–Sc alloy and Al–Sc–Zr alloy under different weight percentage. The precipitation strengthening of as-caststructure, Al–Sc alloy and Al–Sc–Zr alloy have been analyzed during aging at 350 °C. From the experimental investigation,only little difference in micro hardness of developed alloys was observed during initial stage of aging. The peak hardnessof Al–Sc–Zr alloy was maintained for a relatively longer period for producing better thermal stability. Three-dimensionalatomic probing indicated that the precipitation of Zr in the precipitate at the initial stage of aging which can inhibit thegrowth of the precipitate’s size. TEM results showed that the Al–Sc–Zr alloy formed two precipitates of different sizes atthe over-aging phase after the peak state of hardness.
M. Manoj,G.R. Jinu,T. Muthuramalingam,R. Leo Bright Singh 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.4
The ceramic particles reinforced with aluminium metal matrix composites(AMMCs) has found its usage in variousapplications due to its distinct performance parameters. In the present study, an effort was made to synthesize and analysethe mechanical characteristics of TiB2 reinforced Al7075 metal matrix composites (MMCs) using stir casting technique byvarying the weight percentage of TiB2. The micro Vickers hardness, tensile strength, flexural properties are considered as theperformance measures in the present investigation. It was found that the addition of TiB2 could enhance the mechanicalcharacteristics of the MMCs significantly. The enhancement in hardness of the MMCs is due to the amalgamation of rigorousreinforcement in the matrix. The TiB2 reinforcement in the matrix alloy was found to increase the tensile and flexural strengthof AMMCs considerably. The TiB2 particles are consistently disseminated in aluminium matrix alloy with considerablebonding strength.