Transmission Electron Microscopy Study of Structural Changes Hot Deformation of Titanium Alloys
The investigation of microstructural changes during hot deformation of titanium alloys is of great practical interest especially for the establishment of optimal regimes of high-temperature mechanical treatment and for the study of possibility of application of hot deformation of a+ß alloys in ß field. Deformation in the ß field offers well-known technological advantages as well as improvements in plane strain fracture toughness and creep strength resist ance.(1) At the same time, 13 deformation, as numerous investiga-tions reveal, decreases tensile ductility of the alloys in comparison with deformation in a+ß field. However in (1) it was demonstrated that the proper choice of deformation conditions in beta field of Ti-6A1-4V results in the same tensile ductility as after a+ß deformation. The main prerequisite being extensive deformation with no recrystallization.
KeywordsTitanium Alloy Dislocation Structure Creep Strength Water Quenching Subgrain Boundary
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