High strength nanocrystalline Ll(2)-Al-3(Ti,Zr) intermetallic synthesized by mechanical alloying

Nanocrystalline L1(2)-Al-3(Ti,Zr) intermetallic has been synthesized directly by mechanical alloying of elemental blends of the nominal composition Al-75(Ti25-xZrx) for x = 0, 5, 10, 15, 20 and 25. The Ion g range order parameter is found to increase with the Zr content. The lattice parameter difference between the L1(2)-Al-3(Ti,Zr) and Al was minimum for the alloy with 10% Zr. A very high hardness of 3.23 GPa was achieved for the L1(2) phase in the A1(75)Ti(15)Zr(10) composition in the green compact condition with a relative density of 77.6%. (c) 2006 Elsevier Ltd. All rights reserved.