Журнал прикладного машиностроения

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Investigation of Fracture Toughness on FSW Joints of Nano Fly Ash Reinforced Aluminium Composites

Narasa Raju Gosangi and Lingaraju Dumpala

The fracture toughness is a desirable structural property which governs the life of materials and impact strength is the measure of toughness in terms of absorbed energy. In this research work, nano fly ash (NFA) reinforced Al6063 matrix based composites are prepared with different %wt. of NFA and consequently the friction stir weld (FSW) joints of composites are fabricated with tool rotational & traverse speeds as welding process parameters. The energy absorption behavior is studied on FSW joints by Charpy impact test. Higher toughness values were observed on the FSW joints compared to base Al6063 alloy due to the influence of FSW process parameters. Reduced impact strength on FSW joints was observed with increased NFA reinforcement in the fabricated composites. The NFA particles acts as obstacles to dislocation motion thereby decreases the ductility of fabricated composites. The increased brittleness with hard NFA particle inclusion in the composites leads to the reduction in fracture toughness.