Phase-stability dependence of plastic deformation behavior in Ti-Nb-Ta-Zr-O alloys |
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Authors: | J Hwang S Kuramoto T Furuta K Nishino T Saito |
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Affiliation: | (1) Toyota Central R&D Laboratories Inc., 41-1, Yokomichi, Nagakute, 480-1192 Aichi, Japan |
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Abstract: | The authors investigated the effects of alloy content on mechanical properties to make clear a correlation between plastic
deformation behavior and β-phase stability in Ti-Nb-Ta-Zr-O alloys. It was realized that there was specific compositional
area in which the alloy exhibited little work hardening and minimum Young’s modulus value. The specific area was expressed
by the bond order (Bo), based on theDV-Xα method, of 2.87 and the averaged electron/atom ratio (e/a) of 4.24, which corresponded to those of a multifunctional β titanium
alloy, “Gum Metal.” These electronic conditions also minimized ideal strength required for plastic deformation without any
dislocation activity. The deformation behavior of alloys in the specific compositional area revealed that the unique behavior
could be characterized by a “giant fault.” It was also confirmed that such a compositional area corresponded to the phase
boundary between the α″ martensite and β phases at room temperature.
This paper was presented at the Beta Titanium Alloys of the 00’s Symposium sponsored by the Titanium Committee of TMS, held
during the 2005 TMS Annual Meeting & Exhibition, February 13–16, 2005 in San Francisco, CA. |
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Keywords: | β -phase stability plastic deformation behavior work hardening Young’ s modulus |
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