Phase diagram modeling for titanium alloys with light element impurities |
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Authors: | N Saunders L Chandrasekaran |
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Affiliation: | 1. Department of Materials Science and Engineering, University of Surrey, GU2 5XH, Guildford, Surrey, UK
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Abstract: | It is well known that low levels of light element impurities, such as oxygen and nitrogen, can significantly modify phase
equilibria in conventional titanium alloys. However, although the role of nitrogen and oxygen as alpha stabilizers is well
established, little quantitative work exists in ternary and higher order systems. Moreover the effect of such elements on
equilibria with phases other than cx-and P-Ti is often unknown. The problems in measuring light elements at the microscopic
level adds to the difficulty of establishing partitioning, and old axioms are often transferred to new alloys with little
evidence that they are applicable. As part of a current program on titanium alloys, phase diagram modeling has been performed
for a variety of titanium alloys with additions of oxygen and nitrogen. This paper presents results for the system Ti-Al-V-O-(N,C)
with particular reference to the O additions to the commercially important alloy Ti-6A1-4V.
This paper was presented at the International Phase Diagram Prediction Symposium sponsored by the ASM/MSD Thermodynamics and
Phase Equilibria Committee at Materials Week, October 21–23,1991, in Cincinnati, OH. The symposium was organized by John Morral,
University of Connecticut, and Philip Nash, Illinois Institute of Technology. |
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