Abstract
This paper reports the effect of powder density variation on the
premixed Ti-6Al-4V/Cu and Ti-6Al-4V/2Cu Composites. Two sets
of experiment were conducted in this study. Five deposits each
were made for the two premixed composites. Laser powers were
varied between 600 W and 1700 W while a scanning speed of 0.3
m/min is kept constant throughout the experiment. Investigations
were conducted on the microstructures and microhardness of the
laser deposited premixed Ti-6Al-4V/Cu and Ti-6Al-4V/2Cu
composites. It was found that the evolving microstructures of the
composites were characterised with the formation of macroscopic
banding and Widmanstatten; and disappears as it grows towards the
fusion zone (FZ) and this could be attributed to the changes in the
distribution of heat input. Sample A2 of premixed Ti-6Al-4V/Cu
composite gives the highest hardness of 393 ± 6.36VHN0.5 while
sample B4 of premixed Ti-6Al-4V/2Cu composites depicts the
highest hardness value of 373 ± 9.18VHN0.5.