Metals and materials international

The Korean Institute of Metals and Materials (대한금속재료학회)
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Oxygen Effects on the Mechanical Properties and Lattice Strain of Ti and Ti-6Al-4V

  • Oh, J.M. (Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources) ;
  • Lee, B.G. (Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources) ;
  • Cho, S.W. (Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources) ;
  • Lee, S.W. (Department of Metallurgical Engineering, Chungnam National University) ;
  • Choi, G.S. (Gangwon Industrial Technology Research Center, Research Institute of Industrial Science & Technology) ;
  • Lim, J.W. (Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources)
  • Published : 2011.10.20
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Abstract

The effects of oxygen on the mechanical properties and the lattice strain of commercial pure CP) Ti and Ti-6Al-4V alloys are discussed here in terms of the Vickers hardness, tensile strength and elongation. The Vickers hardness and tensile strength of the CP Ti and the Ti-6Al-4V alloys increased with an increase in the oxygen concentration. On the other hand, the elongation of the CP Ti decreased considerably as the oxygen concentration increased, while that of the Ti-6Al-4V alloys gradually decreased as the oxygen concentration increased. Thus, the oxygen concentration has a greater effect on the mechanical properties of CP Ti compared to its effects on the Ti-6Al-4V alloy. This can be explained in terms of the difference in the solid solution effect of oxygen between the CP Ti and the Ti-6Al-4V alloy. Where, the mechanical properties of Ti-6Al-4V alloy were previously affected by an earlier lattice expansion caused by an increment in the c/a ratio of the Ti-6Al-4V during the Al and V alloying process.

Keywords

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