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An Investigation of the Gamma Phase of the Titanium-Aluminum Binary Alloy with Zirconium Additions
AIR FORCE INSTITUTE OF TECHNOLOGY WRIGHT-PATTERSON AFB OH WRIGHT-PATTERSON AFB
The titanium-aluminum equiatomic alloy has qualities of excellent corrosion resistance, good strength to weight ratio, and good hot hardness. These qualities would make this alloy a desirable structural material were it not for an inherent brittleness and lack of ductility. The brittleness is attributed to an ordered-face-centered-tetragonal cell with a ca ratio of 1.020. Several attempts have been made to reduce the ca ratio to unity through ternary additions. A reduction of this ratio to 1.006 has been reported with zirconium as the ternary addition however, this value was attained outside of the gamma phase. During this investigation the limit of solubility of zirconium in the gamma phase at 2325F was determined to be slightly less than 10ao at 55ao aluminum and slightly more than 10ao at 60ao aluminum. The ca ratio varied with composition from 1.016 to 1.030.
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