ChemInform Abstract: The Al—B—Nb—Ti System. Part 4. Experimental Study and Thermodynamic Re‐Evaluation of the Binary Al—Nb and Ternary Al—Nb—Ti Systems.

Witusiewicz, V.T.; Bondar, A. А.; Hecht, U.; Velikanova, Т. Ya.

doi:10.1002/chin.200924012

Cited by 27 publications

(93 citation statements)

References 1 publication

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“…For the Co-Al system the data of McAllister [16] are accepted except that the current DTA data show that the melting point of CoAl is at 1675°C. The Al-Nb system is adopted from Ref 17 except for the melting point of NbAl 3 and the temperature and the composition of the eutectic L M NbAl 3 + Nb 2 Al which have been recently experimentally measured and assessed, respectively, by Witusiewicz et al [13] The Co-Nb system has been re-investigated within the scope of the present project [2,15] except for the Nb-rich part which is adopted from the assessment by Hari Kumar et al [1] The compositions of the investigated alloys, of the primary phase, i.e., the phase that formed first from the melt, and of the eutectics measured by SEM-EDS and electron probe miroanalysis (EPMA), as well as liquidus temperatures and temperatures of the invariant reactions determined by DTA are summarised in Table 2. Figure 1 shows a number of micrographs of samples which are decisive for establishing the liquidus projection.…”

Section: Methodsmentioning

confidence: 99%

Liquidus Projection and Reaction Scheme of the Co-Al-Nb System

Palm

Dovbenko

et al. 2012

J. Phase Equilib. Diffus.

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By metallographic observation of the as-cast microstructures, determination of the liquidus temperatures and the temperatures of invariant reactions by differential thermal analysis, and measurement of the compositions of the primary phases and the eutectic residuals by electron probe miroanalysis, a liquidus projection for the Co-Al-Nb system has been established for the first time. The binary Co-Nb intermetallic phases have a large solid solubility for Al and their melting temperatures increase markedly by the addition of Al. The only ternary compound, the Heusler phase NbCo 2 Al, melts incongruently at about 1485°C. By CALPHAD modelling the consistency of the experimental data has been checked. Calculated and experimentally determined temperatures of the invariant reactions are in good agreement and are summarised within a reaction scheme.

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Section: Methodsmentioning

confidence: 99%

Liquidus Projection and Reaction Scheme of the Co-Al-Nb System

Palm

Dovbenko

et al. 2012

J. Phase Equilib. Diffus.

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“…More detailed analysis of the phase diagram shows that this ternary phase is formed in eutectoid reaction from bcc beta phase at 1260 K. It seems that identified in the sample beta phase is the result of the alloy preparation process, in which ternary phase did not manage to precipitate yet. Pandat Software [21] and the data optimized by Witusiewicz et al [22] were used to complete these calculations.…”

Section: Ti6al7nb Alloy Phase Compositionmentioning

confidence: 99%

Electrochemical synthesis of oxide nanotubes on Ti6Al7Nb alloy and their interaction with the simulated body fluid

Stępień

Handzlik

Fitzner

2016

J Solid State Electrochem

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The aim of the present work was to investigate electrochemical behavior of the Ti6Al7Nb alloy in the simulated body fluid (SBF) containing Ca 2+ , HCO 3 − , and HPO 4 2 − ions. At first, optimal conditions necessary for oxide nanotube formation were determined. The experiments were conducted in the 1 M (NH 4 ) 2 SO 4 with 0.5 wt% NH 4 F electrolyte at room temperature. Anodization of the alloy samples was carried out under variable external voltage U in the range from 10 to 40 V at room temperature. Obtained surface morphology was examined by SEM and X-ray techniques. Nanotube diameter was calculated and correlated with the imposed voltage. Having control over the size of nanotubes, samples with the obtained nanostructures of a chosen diameter were immersed into SBF solution with pH = 7.4 for a fixed period of time. Then, they were removed from the fluid and subjected to the electrochemical investigation. Corrosion current and corrosion potential were determined, and it was found that the best anticorrosion properties were obtained for heat-treated nanotube layer: i corr = 39 nA/cm 2 and E corr = −0.236 V vs Ag/AgCl. Finally, the interaction between the oxide surface and the solution was studied using polarization and electrochemical impedance spectroscopy (EIS) techniques.

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“…The phase diagram of Nb rich γ-TiAl based alloys is rather complex and still under research [25,26] even though it is composed of only three elements. At temperatures up to service temperature (about 700 °C to 800 °C ) γ-TiAl alloys mainly consist of the tetragonal γ-TiAl phase (L10 structure, P4/mmm) and the hexagonal α2-Ti3Al phase (D019 structure, P63/mmc).…”

Section: Development Of Phase Constitution With Temperature For Ti-42mentioning

confidence: 99%

In Situ High-Energy X-ray Diffraction during Hot-Forming of a Multiphase TiAl Alloy

Stark

Rackel

Tankoua

et al. 2015

Metals

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Intermetallic γ-TiAl based alloys exhibit excellent high-temperature strength combined with low density. This makes them ideal candidates for replacing the twice as dense Ni base super-alloys, currently used in the medium temperature range (~700 °C ) of industrial and aviation gas turbines. An important step towards the serial production of TiAl parts is the development of suitable hot-forming processes. Thermo-mechanical treatments often result in mechanical anisotropy due to the formation of crystallographic textures. However, with conventional texture analysis techniques, their formation can only be studied after processing. In this study, in situ high-energy X-ray diffraction measurements with synchrotron radiation were performed during hot-forming. Thus, it was possible to record the evolution of the phase constitution as well as the formation of crystallographic texture of different phases directly during processing. Several process temperatures (1100 °C to 1300 °C ) and deformation rates were investigated. Based on these experiments, a process window can be recommended which results in the formation of an optimal reduced texture. OPEN ACCESSMetals 2015, 5 2253

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ChemInform Abstract: The Al—B—Nb—Ti System. Part 4. Experimental Study and Thermodynamic Re‐Evaluation of the Binary Al—Nb and Ternary Al—Nb—Ti Systems.

Cited by 27 publications

References 1 publication

Liquidus Projection and Reaction Scheme of the Co-Al-Nb System

Liquidus Projection and Reaction Scheme of the Co-Al-Nb System

Electrochemical synthesis of oxide nanotubes on Ti6Al7Nb alloy and their interaction with the simulated body fluid

In Situ High-Energy X-ray Diffraction during Hot-Forming of a Multiphase TiAl Alloy

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