Studies on Dissimilar Friction Stir Welded Al–4Cu–TiB₂ In Situ Composites with Base Alloy

Abstract:

Friction stir welding was performed on Al–4Cu alloy and Al–4Cu in situ composites reinforced with TiB₂ with various reinforcement contents (3wt% and 6wt%), which were fabricated using a stir-casting route. The fully annealed and solutionized alloy and the in situ composites were friction stir welded using an M6 threaded pin tool operated at a constant rotational speed (1400 r/min) and traverse speed (40 mm/min); the welding was performed with the composites to base alloy on both the advancing and retreating sides of the welding tool in different experiments. Mechanical properties such as hardness and tensile behavior were evaluated for samples in both the as-welded and post-weld-aged conditions. An increase in the amount of reinforcement material in the Al-based composites caused the retreating side to exhibit better mechanical properties than the advancing side. The hardness values of the first mode and second mode in the weld nugget varied with respect to the reinforcement content of the composite and with respect to whether the composite in the retreating side or the advancing side in the weldments. The fractography details are also presented.

• Periodical: Advanced Materials Research (Volume 1148)
• Pages: 165-175
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1148.165
• Online since: June 2018
• Authors: Sangathoti Haribabu*, M. Ashfaq, Katakam Sivaprasad, S. Muthukumaran, R. Narayanasamy
• Keywords: Aluminum Metal Matrix Composites (AMMC), Fractography, Friction Stir Welding Zones, Microhardness

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