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In this paper,aging response of a recently developed near β Ti-25Nb-2Mo-4Sn(wt%) alloy with high strength and low modulus was investigated intensively.The experimental results from X-ray diffraction and transmission electron microscopy showed that the aging production of the Ti-2524 alloy was(β+ω) or(β+α) even under the same aging treatment condition,depending on the pre-treatments prior to the aging.Solid evidence confirmed the competition between stable α phase and metastable ω phase during the decomposition of β phase on aging.Different aging response of Ti-2524 alloy can be attributed to high-density dislocations and grain boundaries which suppress the formation of ω,and alternatively promote a phase formation.This provides a thermo-mechanical approach to inhibit deleterious ω phase formation and assist fine α phase precipitation.Upon an appropriate aging treatment,superior mechanical properties of high ultimate tensile strength(1233 MPa) and low elastic modulus(77 GPa) were achieved in Ti-2524 alloy.
In this paper, aging response of a previously advanced β Ti-25Nb-2Mo-4Sn (wt%) alloy with high strength and low modulus was investigated intensively. The experimental results from X-ray diffraction and transmission electron microscopy showed that the aging production of the Ti-2524 alloy was (β + ω) or (β + α) even under the same aging treatment condition, depending on the pre-treatments prior to the aging. Solid evidence confirmed the competition between stable α phase and metastable ω phase during the decomposition of β phase on aging. Different aging response of Ti-2524 alloy can be attributed to high-density dislocations and grain boundaries which suppress the formation of ω, and optionally promote a phase formation. This provides a thermo-mechanical approach to inhibit deleterious ω phase formation and assist fine α phase precipitation. where an appropriate aging treatment, superior mechanical properties of high ultimate tensile strength (1233 MPa) and low elastic modulus (77 GPa) were achieved in Ti-2524 alloy.