Phase Composition, Nanohardness and Young's Modulus in Ti-Fe Alloys after Heat Treatment and High Pressure Torsion

Four titanium-iron binary alloys were studied. They were preliminarily annealed in the (alpha + beta) and (alpha + TiFe) regions of the Ti-Fe phase diagram. The changes in the phase composition, nanohardness, and Young's modulus of the annealed alloys before and after high pressure torsion (HPT) were investigated. Alloys with high iron content after HPT contain a large fraction of the omega phase. The nanohardness of the material in the middle of the radius of the HPT samples varies in the same range of values between 4.4 and 5.8 GPa, regardless of the preliminary annealing. Young's modulus is a parameter sensitive to structural and phase changes in the material. After HPT, it increases by a factor of 1.5 after preliminary annealing in the (alpha + beta) region in comparison with that in (alpha + TiFe) region.

Automated summary

Four titanium-iron binary alloys were studied, with changes in phase composition, nanohardness, and Young's modulus investigated before and after high pressure torsion (HPT). Alloys with higher iron content after HPT exhibited a larger fraction of the omega phase. Nanohardness values of the material at the center of the HPT samples ranged between 4.4 and 5.8 GPa, regardless of preliminary annealing conditions. Young's modulus was found to be a sensitive parameter to structural and phase changes, increasing by a factor of 1.5 after annealing in the (alpha + beta) region compared to the (alpha + TiFe) region.