Synthesis of Al/Al 3Ti two-phase alloys by mechanical alloying

Abstract

We have mechanically alloyed mixtures of elemental powders to prepare fine-grained two-phase Al/Al 3Ti powders at the compositions Al-20at.%Ti and Al-10at.%Ti. Hexane was used to prevent agglomeration of the powder during mechanical alloying. Carbon from the decomposition of the hexane was incorporated in the powder and reacted with titanium to form a fine dispersion of carbides in the final hot-pressed compact. We consolidated the mechanically alloyed powders by hot pressing. Yield strength and ductility were measured in compression. At 25°C, the compressive yield strengths were 1.25 and 0.6 GPa for the Al-20at.%Ti and Al-10at.%Ti alloys respectively. The ductility of the Al-10at.%Ti alloy exceeded 20% for 25 < T < 500°C.