Reasonably complete information is available on the constitution and structure of binary and ternary alloys of titanium. Thus, reliable partial or complete phase diagrams have been determined for 37 binary titanium alloy systems. In addition, some solid-solubility data and information on inter-metallic compounds have been obtained in 14 other binary titanium alloy systems.nSimilarly, alloy-constitution data are available for 67 ternary titanium alloy systems. Almost half (33) of these are concerned with a study of interstitial-element (oxygen, nitrogen, carbon, and hydrogen) combinations, either alone (11systems) or in combination with substitutional alloying addi?tions (2 systems).Phase-diagram information has been obtained on most of the ternary alloy systems of commercial interest, e. g., Ti-Al-Mo and Ti-Al-V. Unfortunately, much of the work with ternary Ti-Al-base alloys was carried out before ordering in the titanium-rich alpha phase of Ti-Al alloys was recognized. Consequently, a good understanding of the effects of ternary alloy additions on the structure of Ti-Al-base alloys is not yet available.
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