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Ti-2Al-2.5Zr and Ti-4Al-2V alloy at 300 ℃ characteristics of water vapor in the oxide layer


00 ℃ under the TZM alloy particles reinforced Norton index of 12, while the substrate is only 5. Clearly, the particles reinforced leading index increased Norton, enhanced by the particles detected ZrO diameter of about 24nm, molybdenum carbide particle size of about 60150nm. Also found that creep at 1400 ℃ for 80h with more than short-term creep strengthening particles that occur at that temperature caused the precipitation of carbide grain boundary carbide particles intensive. TZM alloy at 1600 ℃ after creep 183.5h strengthened into a diameter of about 100nm particles of titanium-rich small pieces. (5) bitmap using EBSD to detect the initial state and the creep and the formation of abnormal texture pole figures were studied, found in the molybdenum plate is {100} texture was in the TZM alloy {111} texture. Two kinds of materials, development of creep and middle area on the surface are different in the pure molybdenum sheet,[link widoczny dla zalogowanych], the surface area mainly f100} texture in the middle area to reduce this type of texture, and large numbers of { 111l texture. In the TZM alloy is the {111} texture is stronger than the surface area middle zone. Liao Chang Quoted international \-2AI a 2.5Zr and T BU 4AI a 2V alloy 300oG characteristics of water vapor in the Ti oxide layer of a 2A1-2.5Zr and Ti 4A1-2V alloy is a 2 new O / titanium alloy, mainly used in aviation , nuclear reactions, and other special areas of the pipeline system. Currently, the research has focused on the alloy after deformation,[link widoczny dla zalogowanych], deformation stress-strain behavior, texture, crystallization kinetics, and injection of N surface modification of the tongue. As the alloy is also used for the neutral environment,[link widoczny dla zalogowanych], the oxidation behavior is essential. Therefore, using the x-ray diffraction analysis (XRD), X-ray spectroscopy (XPS), Auger electron spectroscopy (AES),[link widoczny dla zalogowanych], transmission electron microscopy (TEM) by means of these two kinds of alloys at 300 ℃ characteristics of water vapor in the oxide layer were studied. Test sample size 30mmx20mmx2mm, sample 8.5MPa, pH value of 7.0 and 0.5 of water vapor in the exposure of 300 ℃ 500h and 1000h, with continuous quality analysis method for the determination of non-alloy oxidation kinetics. Alloy oxidation kinetics showed that the oxidation of alloys 2 and conform to the parabolic law, with the oxidation of the conduct of Phase 1 oxidation rate increases rapidly, then decreased. Ti 2A1-2.5Zr alloy samples of a surface layer of dense protective layer, the thickness ratio of Ti 4A1-2V alloy of a thinner. Before and after the two kinds of oxide alloy XRD analysis showed that two kinds of alloy surface before oxidation are O / phase, oxidation is the formation of anatase TiO, with increasing oxidation time, two kinds of TiO the alloy diffraction peak intensity increases and a new diffraction peaks, indicating that the oxide thickness increased. The Raman spectroscopy analysis of the surface by TiO 6 features the band, respectively, and the XRD spectra corresponding to TiO. With the AES composition of oxide layer was measured, the results show that, with the oxide layer increases, the atomic fraction of titanium increased, the atomic fraction of oxygen reduction, vanadium and zirconium content changed little, and found in the Al-rich zone near the surface, indicating oxidation of Al in the surface segregation. XPS analysis shows that, Tin mainly in the surface, with the oxidation depth increases, there Ti3 +, TiE +, and TiE + content increased. Visible, TiO was formed in the near-surface, The depth of the formation of TiO,, TiO, which is the oxygen from the media environment of the lateral oxide / metal side of the spread of the results. From the TEM images can also be seen on the outer surface of TiO, the inner layer is TiO. Analysis,[link widoczny dla zalogowanych], exist in a steam environment, the size of the hydroxyl ions is smaller than the oxide ions, and low power consumption and hydroxyl ions in the oxide layer plays a major role in the transmission. A 2A1-2.5Zr and Ti Ti 4A1-2V alloy in a high temperature, high pressure, strong alkaline water vapor, the surface of brookite-type TiO, oxidation of water vapor in the neutral form is also the main anatase TiO is the role of hydroxyl ions. As for the oxidation mechanism and the different types of hydroxyl ions on the formation of TiO situation needs further study. Zhou Quoted ((Journal0fAll0vsandCompounds>)

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