Article

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

School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Intermetallics DOI:10.1016/j.intermet.2004.07.014 pp.263-266

ABSTRACT The influences of rare earth metal (Y) on microstructure, mechanical properties and deformability of Ti–43A1–9V alloy are reported. The results show that Ti–43Al–9V–0.3Y alloy is composed of γ, α2, B2 and YAl2 phases. Adding 0.3at.% Y refines the grain size, decreases α2/γ/B2 lamellar thickness of Ti–43Al–9V alloy, and promotes the formation of fine α2/γ 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 °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.

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Keywords

decreases α2/γ/B2 lamellar thickness
 
deformation
 
fine α2/γ lamellae
 
hot deformation experiment
 
lower resistance
 
plastic property
 
rare earth metal
 
uniform recrystallized grains
 
YAl2 phases