Creep resistant gamma titanium aluminide

Predominantly gamma titanium aluminide alloy consisting essentially of, in weight %, about 57 to about 66% Ti, about 30 to about 34% Al, about 3 to about 6% Nb and about 1 to about 3.5% Mn with oxygen present in the range of about 900 to about 1500 parts per million by weight to increase high temperature creep resistance.

Predominantly gamma titanium aluminide alloy consisting essentially of, in weight %, about 59.5 to about 63.5% Ti, about 31 to about 33% Al, about 4 to about 5% Nb and about 1.5 to about 2.5% Mn with oxygen present in the range of about 900 to about 1500 parts per million by weight to increase high temperature creep resistance.

A predominantly gamma titanium aluminide article comprising titanium in the range of about 55 to about 71 weight % and aluminum in the range of about 29 to 35 weight % wherein oxygen is intentionally included in the article in an amount greater than about 800 parts per million by weight effective to increase high temperature creep resistance of the article.

A predominantly gamma titanium aluminide article consisting essentially of, in weight %, about 57 to about 66% Ti, about 30 to about 34% Al, about 3 to about 6% Nb and about 1 to about 3.5% Mn with oxygen present in the range of about 900 to about 1500 parts per million by weight to increase high temperature creep resistance.

A method of making a titanium aluminide material having improved high temperature creep resistance, comprising forming a melt consisting essentially of about 55 to about 71 weight % Ti and about 29 to about 35 weight % Al and adding an oxygen-containing material to the melt to control the oxygen content thereof in an amount greater than about 800 parts per million by weight to increase high temperature creep resistance of predominantly gamma titanium aluminide solidified from said melt.