Decomposition Staging of

The decomposition of β-metastable phase in (α+β)-titanium alloys during continuous heating needs a detailed investigation in the range of relatively small temperatures. The staging of β-solid solution decay was studied on the solution treated and water quenched VT16 (Ti-3Al-5Mo-5V) used for fasteners production. The thermal exo-effects of β-phase decomposition were examined using DSK. Corresponding effects in the in situ X-Ray diffraction patterns and storage modulus temperature dependence in the DMA curves are discussed. A three stage layout of β-decay is reported during continuous heating of VT16 with (α+β)-structure after quenching.     Keywords: metastable phase, phase transformation, in situ XRD, storage modulus, decay, quenching, continuous heating, dynamic mechanical analysi

Relationship Between the Texture and Young’s modulus over the Section of Cold-rolled Rods of Low-modulus Biocompatible Alloy

The influence of the texture type on the Young’s modulus value in the different sections of cold-deformed rods of Zr-31Ti-18Nb alloy (IMP BAZALM) was studied. It was found, an increase in the compression deformation degree from 63 to 84 % of Zr-31Ti-18Nb alloy during cold rolling contributed to the improvement of {001} <110> deformation cube texture. This contributed to the preferential orientation of the directions <001> and <110> parallel to ND and RD (TD) directions, accordingly. The minimum values of the Young’s modulus were typical for areas where low-module <001> orientation prevailed, and the maximum values of the Young’s modulus were characteristic for areas with high-modules <110> orientations. So, in the alloy deformed by 84 %, the lowest values of the Young’s modulus were obtain in the rolling plane up to 53 GPa, and the highest values in plane perpendicular to the rolling direction up to 70 GPa.     Keywords: Zr-Ti-Nb system, biocompatible alloy, Young’s modulus, texture

Structural and Phase Transformation in a Cold-Deformed Titanium Alloy During Aging

The change of structure, phase composition and properties during aging of VT22 (Ti-5Al-5Mo-5V-1Fe-1Cr) titanium alloy rods, pre-quenched fro

Effect of Corbon Content on the Structure and Mechanical Properties of TI-10V-2Fe-3Al Alloy

The effect of carbon content on microstructure and mechanical properties of the transition (α+β)-titanium alloy Ti–10V–2Fe–3Al in a heat-strengthened state was studied. It was established that with the increase of carbon content in the alloy up to the limit of its solubility in a solid solution, the strength of the alloy increases, the plastic characteristics decrease. When the solubility limit of carbon in a solid solution in an alloy is exceeded, the appearance of titanium-based carbide particles was observed, while the strength of the alloy somewhat decreases, due to the decrease of the effect of solid-solution hardening from the elements present in the alloy, which are partially transferred from the solid solution to the titanium-based carbide particles.     Keywords: titanium alloys, titanium carbides, mechanical properties, hardening heat treatment

Cadmium-induced luminescence of recombinant photoprotein obelin.

AbstractIt has been shown for the first time that Cd2+ ions induce substantial bioluminescence of a Ca2+-binding photoprotein: recombinant obelin. The optimum pH for the bioluminescent reaction in the presence of Cd2+ ions is pH 6. The intensity, L, of the light emission for the Cd2+ ions is 75% of the intensity of the signal in the presence of Ca2+. The quantum yields of the reactions in the presence of Cd2+ and Ca2+ are 0.18 and 0.24 respectively. The slope of the straight line (between 5 and 90% of Lmax in the coordinates of log(L(Lmax-L)) vs. log([Cd2+]) is 1.75 ± 0.06, which indicates positive cooperative character of this reaction. At a concentration exceeding 1 · 10−3 M, Cd2+ inhibits the bioluminescent reaction