ChemInform Abstract: The Al—B—Nb—Ti System. Part 1. Re‐Assessment of the Constituent Binary Systems B—Nb and B—Ti on the Basis of New Experimental Data.

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

doi:10.1002/chin.200810012

Cited by 12 publications

(20 citation statements)

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“…8,9). At the same time, SEM analysis suggests that TiB 2 grains remain intact in all experiments, in agreement with a very low solubility of TiB 2 in liquid Al [3]. Therefore, it can be supposed that the Al x Ti particles are formed due to the reaction of liquid Al with TiO 2 existing on the surface of the substrate or with TiC particles found in the TiB 2 ceramics (Fig.…”

Section: Penetration and Interfacial Reactionssupporting

confidence: 54%

“…The composition of these particles is very uncertain for low temperatures, whereas after testing at 1400°C the stoichiometric Al 3 Ti phase (melting temperature T m = 1396°C [3]) with needle-like structure has been found to precipitate at the Al/TiB 2 interface and to grow into the molten aluminium (Figs. 8,9).…”

Section: Penetration and Interfacial Reactionsmentioning

confidence: 97%

“…In particular, TiB 2 with a melting temperature of about 3200°C [3] and a theoretical density of 4.52 g/cm 3 [1] is interesting as an electrode material in the aluminium industry, as temperature or wear protective coating or as constituent of light-weight composites for aerospace, automotive and defence applications [4][5][6]. Besides, titanium diboride is used for the microstructure refinement of cast Al-based alloys [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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High-temperature wetting and interfacial interaction between liquid Al and TiB2 ceramic

Kaban

Nowak³

et al. 2015

J Mater Sci

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The wetting behaviour and interfacial interactions between liquid Al and TiB 2 ceramic have been studied by the sessile drop technique in the temperature range from 700 to 1400°C. At about 800°C, liquid Al starts to wet TiB 2 and at about 1000°C it completely spreads over the ceramic. Al 3 Ti and Al 2 O 3 are found to be the main phases precipitating at the interface. Starting from 1000°C, liquid Al either fill pores or penetrates along the grain boundaries of the TiB 2 ceramic. Scanning electron microscopy analysis of the interfaces evidences that the TiB 2 grains remain intact after the aluminium melt/ceramic interaction even at 1400°C.

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Section: Penetration and Interfacial Reactionssupporting

confidence: 54%

Section: Penetration and Interfacial Reactionsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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High-temperature wetting and interfacial interaction between liquid Al and TiB2 ceramic

Kaban

Nowak³

et al. 2015

J Mater Sci

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“…The newly derived interaction parameters were listed along with those adopted from literature. [2009Wit]. A full reaction sequence from the computed results was also written.…”

Section: Ternary Phase Equilibriamentioning

confidence: 99%

“…Their results showed a miscibility gap in the liquid phase, which has no experimental support. Very recently, [2009Wit] carried out additional experiments on selected ternary and binary alloys and used the new results along with selected experimental data from the literature to recalculate in detail the phase equilibria. …”

mentioning

confidence: 99%

Al-B-Ti (Aluminum-Boron-Titanium)

Raghavan¹

2009

J. Phase Equilib. Diffus.

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The previous review of this ternary system by [2004Bon] presented partial liquidus and solidus surfaces, partial isothermal sections at 1000, 820, and 727°C and a vertical section at 98 mass% Al. [2005Rag] reviewed briefly the experimental and calculated results of [2001Fje] and presented for Al-rich alloys a schematic liquidus projection, a reaction scheme and two isothermal sections at 1000 and 800°C. These reviews concluded that the diborides AlB 2 and TiB 2 do not form a continuous solid solution and that there are no stable ternary phases in the system. In their thermodynamic treatment, [2005Gro] ignored ternary interactions and based their calculations solely on the binary parameters. Their results showed a miscibility gap in the liquid phase, which has no experimental support. Very recently, [2009Wit] carried out additional experiments on selected ternary and binary alloys and used the new results along with selected experimental data from the literature to recalculate in detail the phase equilibria. Binary SystemsIn the Al-B system [2004Mir], two borides are known: AlB 2 (C32, AlB 2 -type hexagonal) and AlB 12 (AlB 12 -type tetragonal). The Al-Ti phase diagram [2006Sch] has the following intermediate phases: Ti 3 Al (D0 19 , Ni 3 Sn-type hexagonal, denoted a 2 ), TiAl (L1 0 , AuCu-type tetragonal, denoted c), TiAl 2 (HfGa 2 -type tetragonal, denoted g by [2009Wit]), TiAl 3 (HT) (D0 22 -type tetragonal, denoted e by [2009Wit]), and TiAl 3 (LT) (tetragonal, space group I4/ mmm, denoted e(l) by [2009Wit]). Based on their own assessment [2008Wit2], [2009Wit] included two previously known compounds: Ti 2+x Al 5Àx (tetragonal, space group P4/ mmm, denoted f) and Ti 3 Al 5 (tetragonal, space group P4/ mbm), which were excluded by [2006Sch] in their assessed diagram. The Ti-B phase diagram [2004Ma, 2008Wit1] shows three intermediate phases: TiB (B27, FeB-type orthorhombic), TiB 2 (C32, AlB 2 -type hexagonal) and Ti 3 B 4 (D7 b , Ta 3 B 4 -type orthorhombic). Ternary Phase EquilibriaWith starting metals of 99.99% Al, 99+% B and 99.9% Ti, [2009Wit] arc-melted under Ar atm 10 ternary alloys with B contents up to 2 at.% (with the exception of one alloy with 7.5 at.% B). Five binary alloys free of B were also made with Al/Ti atom ratio of either $1 or $3. The alloys were annealed between 1350 and 1400°C for 4-10 h. The phase equilibria were studied with the scanning electron microscope equipped with energy dispersive x-ray analyzer, x-ray powder diffraction and differential thermal analysis at heating/cooling rate of 20°C per min. The thermal arrests and the deduced phase changes were listed Ti Atomic Percent Aluminum A to m ic P e r c e n t T it a n iu m A to m ic P e r c e n t B o r o n Al B Fig. 1 Al-B-Ti computed liquidus projection [2009Wit] Atomic percent Aluminum Atomic percent Boron Fig. 2 Al-B-Ti computed partial liquidus projection showing the primary fields of (bTi), (aTi) and c [2009Wit]

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Interfaces and defects in a successfully hot-rolled steel-based composite Fe–TiB 2

et al. 2015

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ChemInform Abstract: The Al—B—Nb—Ti System. Part 1. Re‐Assessment of the Constituent Binary Systems B—Nb and B—Ti on the Basis of New Experimental Data.

Abstract: WITUSIEWICZ*, V. T.; BONDAR, A. A.; HECHT, U.; REX, S.; VELIKANOVA, T. Y.; J. Alloys Compd. 448 (2008) 1-2, 185-194; RWTH Aachen, ACCESS e.V.,

Cited by 12 publications

References 1 publication

High-temperature wetting and interfacial interaction between liquid Al and TiB2 ceramic

High-temperature wetting and interfacial interaction between liquid Al and TiB2 ceramic

Al-B-Ti (Aluminum-Boron-Titanium)

Interfaces and defects in a successfully hot-rolled steel-based composite Fe–TiB 2

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