ChemInform Abstract: The Al—B—Nb—Ti System. Part 2. Thermodynamic Description of the Constituent Ternary System B—Nb—Ti.

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

doi:10.1002/chin.200829013

Cited by 23 publications

(31 citation statements)

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“…[39] This is due to the thermodynamic instability of AlB 2 due to the aforementioned decomposition reaction (Eq 1), though it should be noted that the transformation rate is slow. [26,40] The computationally determined Al-Ti-B isotherms generated by Witusiewicz et al [41] have been confirmed by experimental results and provide reliable equilibrium phase relations at 1000°C (Fig. 1c).…”

Section: 22mentioning

confidence: 55%

“…Fig. 1 Isothermal ternary diagrams at 1000°C of, (a) Al-B-C system as presented by Grytsiv; [36] (b) Al-Ti-C system as presented by Pietzka and Schuster, where H and P represent the Ti 2 AlC and Ti 3 AlC phases, respectively, [30] and; (c) Al-Ti-B system as presented by Witusiewicz et al [41] b 2.2 Processing 2.2.1 Preparation of Carbide Preforms. The Ti 2 AlC/ B 4 C powders were mixed in the molar ratios of 4.5:5 and 7:4 for the BR and TiR composites, respectively.…”

Section: Methodsmentioning

confidence: 99%

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Reactions Between Ti2AlC, B4C, and Al and Phase Equilibria at 1000 °C in the Al-Ti-B-C Quaternary System

Agne

Anasori

Barsoum

2015

J. Phase Equilib. Diffus.

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As automotive, aerospace and the power industries increasingly look to carbide and boride based aluminum, Al, composites for their high specific strengths and increased thermal stability, it is important to characterize the equilibrium phase relations at temperatures common for processing these composites. Herein, two composites were fabricated starting with Al, Ti 2 AlC, and B 4 C. The Ti 2 AlC/B 4 C powders were mixed in both 50/50 and 75/25 vol.% ratios and cold pressed into 53% dense preforms. The preforms were pressureless melt infiltrated in the 900-1050°C temperature range with Al. Ten hour equilibration experiments were also conducted at 1000°C. X-ray diffraction and scanning electron microscopy confirmed that neither Ti 2 AlC nor B 4 C was an equilibrium phase. A number of reaction phases-AlB 2 , Al 3 BC, TiB 2 , TiC, TiAl 3 and Al 4 C 3 -could be found in the non-equilibrated samples. However, the equilibrium phases were found to be Al, TiB 2 , Al 3 BC, and Al 4 C 3 for the more B-rich composite and Al, TiB 2 , TiC, and Al 4 C 3 for the Tirich composite. From these results, the 1000°C quaternary phase diagram adjacent to the AlTiB 2 -Al 4 C 3 triangle and in the Al-rich corner was developed for the first time. This study is a requisite first step for the development and use of advanced composites in the Al-Ti-B-C system.

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Section: 22mentioning

confidence: 55%

Section: Methodsmentioning

confidence: 99%

Reactions Between Ti2AlC, B4C, and Al and Phase Equilibria at 1000 °C in the Al-Ti-B-C Quaternary System

Agne

Anasori

Barsoum

2015

J. Phase Equilib. Diffus.

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“…The lattice parameters of TiB hardly differ in the binary and ternary alloys, which agrees well with EMPA data, according to which the solubility of aluminum in this boride is no more than 0.05 at.%. As shown by DTA, the greater aluminum content, the higher the melting temperature of the alloys and the temperature of β + TiB ↔ α phase transition [31].…”

Section: As-cast Ternary Alloysmentioning

confidence: 98%

“…For this reason, a scientifically sound selection of a doping agent is hardly possible. The previous papers focused on examining the phase equilibria and constructing the phase diagrams in titanium corners of the following ternary systems: Ti-Al-B [32], Ti-Si-B [12,33], Ti-Ge-B [34,35], and Ti-Sn-B [36] ( Table 2). The objective of this paper is to analyze how doping with p-elements (Al, Si, Ge, Sn) and zirconium influences the structure and mechanical properties (hardness from room temperature to 900°C, strength, and plasticity) of alloys based on the two-phase titanium-boride eutectic.…”

Section: Introductionmentioning

confidence: 99%

“…Self-propagating synthesis [26], laser deposition [27], and ingot metallurgy [28,29] are also used. As to the last method, melting of these materials promotes a eutectic formed by the titanium phase and TiB boride in the binary and multicomponent systems [30,31]. Eutectic alloys that can be regarded as in-situ composites are of interest as materials that mainly show good casting properties and high thermal stability.…”

Section: Introductionmentioning

confidence: 99%

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Effect of doping with p-elements (Al, Si, Ge, Sn) and zirconium on the structure and properties of titanium-boride eutectic alloys

Tsyganenko

Bondar

Bilous

et al. 2011

Powder Metall Met Ceram

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The effect of silicon, germanium, tin (X), and aluminum on the structure, physicochemical and mechanical properties of 8.5 at.% Al and 7.5 at.% B) quaternary alloys is studied by metallography, scanning electron microscopy (SEM), X-ray diffraction, differential thermal analysis (DTA), microhardness measurements, Vickers hardness measurements (from room temperature to 900°C), bending tests (room temperature), and compression tests (from room temperature to 700°C). The alloys are melted in an arc furnace from pure materials. Doping with p-elements (Al, Si, Ge, and Sn) does not change the specific titanium-boride eutectic structure in the two-phase (Ti) + TiB field. The doping additions hardly change the chemical composition of the eutectic and only decrease the boron content by 1-2 at.%. The Al, Si, Ge, and Sn (p-elements) are not soluble in TiB titanium borides and completely concentrate in the metal matrix in two-phase (Ti) + TiB alloys. The temperature of incipient sharp softening is shown to be exclusively connected with the matrix composition. It is determined that p-elements increase the hardness and strength of titanium-boride eutectic alloys in the entire temperature range of interest and increase the temperature of incipient sharp softening from 500 to 600-650°C. INTRODUCTIONTitanium monoboride (TiB) is a promising compound for reinforcement of titanium alloys and producing titanium-matrix composites. It is in thermodynamic equilibrium with the titanium-based phase characterized by low boron solubility. The boride and titanium phases have close thermal expansion coefficients and show favorable crystallographic coherency (the structure of the phases is shown in Table 1). Titanium boride is refractory and hard and has good wear resistance and high Young's modulus.Analysis of scientific publications of the last years shows that the number of papers focusing on titanium-matrix boride-reinforced composites increases. Test materials are mainly produced with powder metallurgy

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Experimental Investigation on the Phase Equilibria of the Nb-Ti-Si-B System at 1500 °C

Sun

Yang

Guo

et al. 2011

J. Phase Equilib. Diffus.

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The phase equilibria at 1500°C of the Nb-Ti-Si-B quaternary at the Nb-rich region were carefully studied. Seven alloys were arc-melted and subsequently annealed at 1500°C for 150 h. BSE image, XRD and EPMA results show that Nbss + T2 + Nb 3 B 2 , Nbss + T2 + Nb 3 Si and Nbss + T2 + Nb 3 B 2 + Nb 3 Si were present in these alloys. Extensive solubility of Ti and Si were found in the Nb 3 B 2 phase. The experimental findings were compared favorably with the calculated phase equilibria. The phase equilibria in the Nb-rich region of the Nb-Ti-Si-B system have Nbss + T2, Nbss + T2 + Nb 3 B 2 , Nbss + T2 + Nb 3 Si and Nbss + T2 + Nb 3 B 2 + Nb 3 Si. This work provides important guide lines on the effect of B addition to the microstructure of the Nb-rich Nb-Ti-Si alloys.

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ChemInform Abstract: The Al—B—Nb—Ti System. Part 2. Thermodynamic Description of the Constituent Ternary System B—Nb—Ti.

Cited by 23 publications

References 1 publication

Reactions Between Ti2AlC, B4C, and Al and Phase Equilibria at 1000 °C in the Al-Ti-B-C Quaternary System

Reactions Between Ti2AlC, B4C, and Al and Phase Equilibria at 1000 °C in the Al-Ti-B-C Quaternary System

Effect of doping with p-elements (Al, Si, Ge, Sn) and zirconium on the structure and properties of titanium-boride eutectic alloys

Experimental Investigation on the Phase Equilibria of the Nb-Ti-Si-B System at 1500 °C

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