Strain hardening of titanium alloys doped

Abstract

The work is dedicated to study of deformation laws of hardening of some Ti-based alloys. It is also offered to use the definition of the parameter of deformation hardening n, which numerical value is possible to determine a phase, which controls deformation of a material, for study of features of deformation of complex alloyed Ti alloys (it is possible for them to change the ratio of α-, β- и ω-phases in wide range by alloying and thermo-mechanical treatment). The influence of phase structure of an alloy and morphology of phase components on numerical value of n is illustrated. The parameter of deformation hardening changes from 0,51 in a case of lamellar structures; when β-phase is located on borders of α-plates, to 0,81 in the case of globular morphology of β-phase. It is determined that for Ti β-alloys with BCC lattice the parameter n can change in an interval 0,5—1,0, in spite of the fact, that it is usual for BCC metals to have a parameter n = 0,5. It is caused by allocation of dispersed precipitations of the ω-phases inside β-grains, sharply reducing quantity of systems of sliding at deformation of an alloy. Alloys with initial stages of precipitations of ω-phases have the parameter n close to 0,5. Alloys with more complete precipitations of the ω-phases are characterized by a parameter n closing to 1.