The sessile drop method combined with contact heating procedure was applied for the investigation of high-temperature interaction between liquid Gd and Y2O3 substrate. Real-time behavior of Gd sample in flowing inert gas (Ar) atmosphere upon heating to and at temperature of 1362 °C was recorded using high-speed high-resolution CCD camera. The results evidenced that molten Gd wets Y2O3 substrate (the contact angle θ < 90°) immediately after melting of metal sample observed at T = 1324 °C (Tm = 1312 °C). During the first 3 min of the sessile drop test, the contact angle dropped from θ = 52° to θ = 24° and then stabilized at the final value of θ f * = 33°. The solidified Gd/Y2O3 couple was subjected to structural characterization using optical microscopy, scanning electron microscopy coupled with x-ray energy-dispersive spectroscopy. The results evidenced that the wettability in the Gd/Y2O3 system has a reactive nature and the leading mechanism of the interaction between liquid Gd and Y2O3 is the dissolution of the ceramic in the liquid metal responsible for the formation of a deep crater in the substrate under the drop. Therefore, the final contact angle θf*, estimated from the side-view drop image, should be considered as an apparent value, compared to the more reliable value of θf = 70° measured on the cross section of the solidified couple.

Inert gas

Liquid metal

10.1007/s11665-019-03954-y

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Citations (3)

Wetting, reactivity, and phase formation at interfaces between Ni–Al melts and TiB₂ ultrahigh‐temperature ceramic

Journal of the American Ceramic Society (2017)

Lixia Xi I. Kaban R. Nowak Grzegorz Bruzda N. Sobczak

Abstract The wetting, reactivity, and phase formation at the liquid Ni–Al/TiB 2 ceramic interfaces have been investigated at the temperatures close to the Ni–Al liquidus line. The wetting kinetics has been studied by the sessile drop technique utilizing liquid drop dispension and high‐speed high‐resolution video imaging. It is established that the wetting behavior changes from a nonreactive for the Al‐rich melts to a dissolution‐reactive for the Ni‐rich melts. For the Ni concentration ≥40 at.%, TiB 2 precipitates are found in the solidified Ni–Al droplets after the high‐temperature interaction of the melts with TiB 2 substrates. Besides, new (Al,Ti)Ni 3 and (Al,Ti) 2 Ni 21 B 6 phases are formed due to dissolution of TiB 2 ceramic in Ni‐rich melts and subsequent solidification.

Liquidus

Dewetting

Reactivity

10.1111/jace.15188

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Citations (20)

Phase separation in ternary Co–Gd–Ti liquids

Journal of Physics Condensed Matter (2013)

Jun Han N. Mattern I. Kaban D. Holland‐Moritz Jozef Bednarčík

The phase equilibria and the solidification behavior of ternary Co–Gd–Ti (Co ≤35 at.%) alloys have been investigated. The phase transformation and equilibria in the liquid phase were studied in situ for two alloys, Co30Gd35Ti35 and Co30Gd50Ti20, by combining electrostatic levitation of the samples with high-energy synchrotron x-ray diffraction (XRD) at elevated temperature. The XRD patterns with two diffuse maxima for molten Co30Gd35Ti35 give direct evidence for liquid–liquid phase separation in this composition. In contrast, no indication for phase separation in the Co30Gd50Ti20 alloy is detected. Coarsened microstructures, typical for the phase-separating systems, are observed for the Co30Gd35Ti35, Co25Gd37.5Ti37.5, Co10Gd45Ti45 and Co30Gd20Ti50 cast alloys. Our findings suggest that the stable miscibility gap of binary Gd–Ti extends into the ternary Co–Gd–Ti system (up to about 30 at.% Co). Thermodynamic calculations of the ternary Co–Gd–Ti system by the CALPHAD method are in good agreement with the experimental results.

Spinodal decomposition

CALPHAD

Ternary numeral system

10.1088/0953-8984/25/24/245104

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Citations (10)

Local atomic arrangements and their topology in Ni–Zr and Cu–Zr glassy and crystalline alloys

Acta Materialia (2013)

I. Kaban P. Jóvári V. Kokotin O. Shuleshova B. Beuneu

Reverse Monte Carlo

Zirconium alloy

10.1016/j.actamat.2013.01.027

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Citations (90)