Effect of aging on the tensile and creep behavior of a fully lamellar near γ-TiAl alloy

An investigation on the effect of aging on the tensile properties and creep behavior of a fully lamellar (FL) Ti–47Al–2Nb–1Mn–0.5W–0.5Mo–0.2Si (at.%) alloy is presented. Aging at intermediate temperatures produces precipitate particles predominantly along α2/γ lamellar interfaces or within α2 lamellae. Most of the precipitates are β-particles with fewer silicides. Aging at intermediate temperatures leads to increased tensile strength as a result of precipitation of β and silicide particles. In addition, aging yields an increased primary creep resistance but a shortened creep life for the FL structure. The shortened creep life of the aged FL structures could be a result of early decomposition of α2 lamellae during creep.