Enhancement of the Strength and the Corrosion Resistance of a PT-7M Titanium Alloy Using Rotary Forging

Чувильдеев, В. Н.; Копылов, В. И.; Нохрин, А. В.; Bakhmet’ev, A. M.; Tryaev, P. V.; Tabachkova, N. Yu.; Чегуров, М. К.; Kozlova, N. A.; Mikhailov, A. S.; Ershova, A. V.; Gryaznov, M. Yu.; Shadrina, Ya. S.; Likhnitskii, K. V.; Степанов, С. П.; Myshlyaev, М. M.

doi:10.1134/s0036029521050050

Cited by 4 publications

(1 citation statement)

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“…Previous studies devoted to the effect of RF on the microstructure of steels and nonferrous metals have shown effective refinement of grains and second phases in highnitrogen steel [25]; improved performance characteristics of the low-carbon steels [26], titanium alpha alloy PT-7M [27], titanium pseudo-beta alloy Ti-15V-3Cr-3Al-3Sn-1Zr-1Mo [28]; and enhancement of such properties as shape memory, corrosion resistance and increased mechanical properties in biocompatible alloys Zr-2.5Nb, nitinols [29,30], and titanium β-alloys Ti-25Nb-15Zr, Ti-15Mo with metastable β-phase [31,32]. However, there is a lack of information in the literature regarding the use of RF for biocompatible alloys based on mechanically stable β-solid solution.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Physico-Mechanical Properties of Biocompatible Titanium Alloy Ti-39Nb-7Zr after Rotary Forging

Illarionov,

Mukanov,

Stepanov

et al. 2024

Metals

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The evolution of microstructure, phase composition and physico-mechanical properties of the biocompatible Ti-39Nb-7Zr alloy (wt.%) after severe plastic deformation by rotary forging (RF) was studied using various methods including light optical microscopy, scanning and transmission electron microscopies, X-ray diffraction, microindentation, tensile testing and investigation of thermophysical properties during continuous heating. The hot-rolled Ti-39Nb-7Zr with initial single β-phase structure is subjected to multi-pass RF at 450 °C with an accumulated degree of true deformation of 1.2, resulting in the formation of a fibrous β-grain structure with imperfect 500 nm subgrains characterized by an increased dislocation density. Additionally, nano-sized α-precipitates formed in the body and along the β-grain boundaries. These structural changes resulted in an increase in microhardness from 215 HV to 280 HV and contact modulus of elasticity from 70 GPa to 76 GPa. The combination of strength and ductility of Ti-39Nb-7Zr after RF approaches that of the widely used Ti-6Al-4V ELI alloy in medicine, however, Ti-39Nb-7Zr does not contain elements with limited biocompatibility and has a modulus of elasticity 1.5 times lower than Ti-6Al-4V ELI. The temperature dependences of physical properties (elastic modulus, heat capacity, thermal diffusivity) of the Ti-39Nb-7Zr alloy after RF are considered and sufficient thermal stability of the alloy up to 450 °C is demonstrated.

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