Effects of Oxygen on Phase Stability and Mechanical Properties of Quenched Ti-Nb Alloys

Abstract:

The effects of oxygen content on microstructures, elastic modulus and tensile properties of quenched Ti-Nb alloys were investigated in order to design a desirable Ti based alloy through casting process. From the microstructural and phase analysis, it is evidently revealed that the volume fraction of β phase increased with increasing content of oxygen, and the occurrence of intermediate ω phase was suppressed in metastable β Ti-Nb based alloys. Martensite transformation temperature decreased with increasing content of oxygen. Therefore, it is suggested that oxygen acts to stabilize β phase rather than α stabilizer in quenched state. Yield strength increased with increasing content of oxygen without a large consumption of ductility in metastable β Ti-Nb based alloys. The variation of mechanical property was explained by the phase stability, phase formation and microstructure in correlation with oxygen and Nb content.

• Periodical: Solid State Phenomena (Volumes 124-126)
• Pages: 1377-1380
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.124-126.1377
• Online since: June 2007
• Authors: Won Yong Kim, Han Sol Kim, Sung Hwan Lim
• Keywords: Elastic Modulus, Mechanical Property, Phase Stability, Ti-Nb Alloy

References

[1] R. Boyer, G. Welsch, E. W. Collings: Materials Properties Handbook: Titanium Alloys, ASM Int., Materials Park (1994), pp.95-97.

[2] H. S. Kim, W. Y. Kim, S. H. Lim: Scripta Mater. Vol. 54 (2006), pp.887-891.