Weldability Study of LM25/ZrO2 Composites by Using Friction Welding

Karthikeyan Govindan


In this paper aluminum (LM25) alloy was chosen as a base matrix metal, and it was reinforced with 0, 3, 6, 9,
12% of Zirconium dioxide (ZrO2) particulates based on weight fraction method. Stir casting method was used
to cast LM25/ZrO2 composite material. The cast samples were subjected to physical and mechanical test viz,
density, hardness, tensile, compression and impact test. The feasibility trial weld was carried out on the
developed composite (similar metals) using Friction welding process (FSW) and then welded sample were
prepared for the various test. The welded samples were subjected to various mechanical tests such as tensile,
hardness and bend test to evaluate the strength of the friction welded joints. Then welded samples were also
subjected to optical microscopy analysis to evaluate microstructures of the base and the weld regions. The
tensile, hardness, compression and impact strength increases with increase in the percentage of ZrO2 in
LM25 alloy. The tensile, hardness and bending strength were high in the welded zone. The microstructures of
the welded tensile tested specimen were analyzed using the Scanning Electron Microscopy (SEM) in a
different region of the welded area. From the above results shows weldability of LM25/ZrO2 composites was
improved with the increase in weight percentage of ZrO2 reinforcement.

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