MECHANISMS OF PRIMARY CREEP IN ALPHA BETA TITANIUM-ALLOYS AT LOWER TEMPERATURES/

Creep occurs in two phase alpha/beta Ti alloys at room temperature and at stresses below the yield strength. In polycrystalline Ti alloys, c reep strain exhibits two distinct power-law regimes, an initial higher exponent which exhausts to a constant value at longer times. However, the exhaustion is much more gradual than that for other metals at low er homologous temperatures. The deformation mode in creep involves het erogeneous planar dislocation arrays. This paper describes the details of the dislocation processes and the observations of dislocation inte raction with alpha/beta interface boundaries in lamellar colony struct ures. (C) 1997 Elsevier Science S.A.