Mechanical Synthesis and Rapid Consolidation of Nanocrystalline TiAl-Al<SUB>2</SUB>O<SUB>3</SUB> Composites by High Frequency Induction Heated Sintering

Abstract

Nano-powders of 1.5TiAl and Al 2 O 3 were synthesized from 1.5TiO 2 and 3.5Al powders by high energy ball milling. Nanocrystalline Al 2 O 3 reinforced composite was consolidated by high frequency induction heated sintering within 2 min from mechanochemically synthesized powders of Al 2 O 3 and 1.5TiAl. The relative density of the composite was 99%. The average hardness and fracture toughness values obtained were 1340 kg/mm 2 and 9 MPaÁm 1=2 , respectively.

Effect of Target Power on Microstructure, Tribological Performance and Biocompatibility of Magnetron Sputtered Amorphous Carbon Coatings

“…Since the actual thickness of the coating was too low (70 nm) to obtain the Young's modulus without substrate influence, this value was taken from our earlier report in which the coating was deposited in similar conditions with a thickness of 200 nm [31]. The properties such as the Young's modulus [33,34] and Poisson's ratio [35,36] of the Al 2 O 3 tip and silicon substrate were taken from earlier reports. After wear generation, the silicon substrate will exhibit high friction [37], which may lead to high wear generation and high von Mises stress during simulation.…”