The Influence of the Thermomechanical Processing on the Mechanical Properties of Beta III Titanium Alloy

摘要

The effects of extrusion and cold swaging on the structure and properties of Beta III titanium were investigated; die loads for extrusion were determined at various temperatures and compared to die loads for other alloys; the effects of age hardening after various thermal and mechanical treatments were studied. Optimum tensile properties were obtained in extruded and aged material when the extrusion temperature was low and the cooling rate was high. The die loads during extrusion compared favorably with those of other titanium alloys. Cold swaging prior to age hardening increased hardness and tensile strength but caused embrittlement when the amount of deformation was small. Ductility was restored by large amounts of cold swaging. Fracture toughness was universely proportional to ultimate tensile strength. These observations are explained on the basis of metallography, electron microscopy, and x-ray diffraction. (Author)