|
Ultra fine grained (UFG) Al5083 based hybrid composite reinforced by SiC and
MoS2 particles was prepared by Friction Stir Processing (FSP). A constant tool travel speed of
50 mm/min and different rotation speeds from 630 up to 1600 rpm were used. The
microstructure of the Al based composite were investigated and compared to base metal and
FSPed samples. It was found that although FSP resulted in decreasing the mean grain size of
the base metal to about 2 µm, the addition of reinforcing particles in microstructure led to the
more decrease in grain size of the alloy. An ultra fine grained hybrid composite with 500 nm
grain size was obtained through rotation speed of 1250 rpm. Moreover, this hybrid composite
showed the highest wear resistance and hardness in comparison to all samples due to the
modification of microstructure and the addition of particles.
Keywords: ultra fine grained materials; Friction Stir Processing; hybrid composite; wear |
full paper (pdf, 1360 Kb)