Influence of yttrium on microstructure, mechanical properties and deformability of Ti-43Al-9V alloy

The influences of rare earth metal (Y) on microstructure, mechanical properties and deformability of Ti-43Al-9V alloy are reported. The results show that Ti-43Al-9V-0.3Y alloy is composed of gamma, alpha(2), B-2 and YAl2 phases. Adding 0.3at.% Y refines the grain size, decreases alpha(2)/gamma/B-2 lamellar thickness of Ti-43Al-9V alloy, and promotes the formation of fine alpha(2)/gamma lamellae. Mechanical property tests show that adding 0.3at.% Y can apparently enhance strength and plastic property of Ti-43Al-9V alloy. The hot deformation experiment at 1200 degrees C indicates that adding 0.3at.% Y can improve deformability of Ti-43Al-9V alloy, because Ti-43Al-9V-0.3Y alloy has smaller grain size, lower resistance to deformation. and fine and uniform recrystallized grains. (c) 2004 Elsevier Ltd. All rights reserved.