Microstructures and mechanical properties including elastic modulus were investigated in
terms of ternary alloying elements Si addition, Nb content variations and tensile test. Martensite
structure with α'(hcp) or α"(orthorhombic) was observed in Ti-xNb-1.5at.%Si, where x=10-20at.%.
The crystal structure of martensite formed from water quenching process was largely dependent upon
Nb content but does not on Si content. On the basis of experimental results obtained, it is suggested
that Si has an effective role to suppress the precipitation of ω phase leading to reduction in elastic
modulus in the metastable β phase region. Metastable β phase region was superior to reduce the
elastic modulus than stable β phase region in the present alloy system. The minimum value of elastic
modulus was measured to 48GPa. We have found that stress-induced martensitic transformation
takes place during the deformation in the present alloys. Within the alloys having β(bcc) phase
studied Nb-poor region appeared to exhibit a dominant behavior for stress-induced martensitic
transformation than Nb-rich region. This result suggests that metastable β phase is superior to stable β
phase for the occurrence of stress-induced martensitic transformation in the present alloy system.
Correction to: Effect of Nb Content on Microstructures and Mechanical Properties of Ti-xNb-2Fe Alloys