INITIAL OBSERVATIONS OF THE EFFECTS OF SAMPLE SIZE ON MICROSTRUCTURE AND PROPERTIES OF HPT PROCESSED TITANIUM

摘要

The uniformity of microstructure in commercial purity titanium processed by High Pressure Torsion (HPT) is studied by X-ray diffraction (XRD) and microhardness measurements. The effects of increasing strain and imposed pressure are contrasted for 10 mm and 20 mm diameter samples. HPT causes grain refinement and α→ω phase transition at room temperature.