Abstract
Friction Stir Welding (FSW) is a solid state joining technique developed to join high strength aluminum alloys and different ceramic reinforced Metal Matrix Composite (MMCs). FSW produces sound welds in MMCs without any detrimental reaction between reinforcement and matrix. In this work, AA6061-10 wt.% B4C Metal Matrix composites (MMCs) are joined using Friction Stir Welding (FSW) process. Different tool rotational speeds are developed to weld the MMCs and the effect of tool rotational speed on mechanical and metallurgical properties of the weldments has been investigated. The different tool rotational speeds, i.e. 800 rpm, 900 rpm, 1000 rpm, 1100 rpm and 1200 rpm are used to obtain defect free welds. It has been observed that, the joint welded with 1000 rpm of tool rotational speed exhibited better mechanical properties compared to the other tool rotational speeds. Weld nugget has finer grains compared to other weld zones and B4C particulates are homogeneously present in Al matrix both in weld and parent metal.
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