Abstract
In the present work, nanocrystalline AA 6061 alloy powders reinforced with fine titania particles were mechanically blended with coarse-grain AA 6061 alloy powders to produce a trimodal microstructure. The nanocrystallite and trimodaled composite powders were consolidated by cold uniaxial compaction, followed by sintering under controlled atmosphere. The microstructural features for the developed trimodaled composite were evaluated using an optical microscope, a scanning electron microscope, and a transmission electron microscope. The mechanical behavior of these consolidates were evaluated at room temperature. It was observed that trimodal bulk nanocomposite had exhibited balanced mechanical properties of enhanced yield strength and improved ductility compared to nanocrystallite composite.