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Results for “Al-Ce-Ni”

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8 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2023

Effect of Mn on eutectic phase equilibria in Al-rich Al-Ce-Ni alloys

Microstructural analysis of additively manufactured (AM) Al-Ce-Ni-Mn alloys has identified phases not predicted from existing ternary liquidus projections in the Al-Ce-Ni system. Because the rapid cooling rate of AM is orders of magnitude above that of traditional casting, it is unclear if these additional phases arose from the non-equilibrium processing conditions of AM, a drastic shift in phase stability in the system due to the addition of 1 wt% Mn, or some combination of these two influences. The phases and microstructure of cast samples of Al-Ce-Ni and Al-Ce-Ni-Mn alloys were characterized for several annealing conditions which revealed the equilibrium phases at different temperatures. Phase analysis confirmed that minute levels of Mn substituted for Ni in the system drastically shifts the liquidus projection in the Al-rich corner of the ternary phase diagram such that the eutectic Al 3 Ni phase is suppressed in favor of the Al 23 Ni 6 (Ce,Mn) 4 phase. Further addition of Mn promotes the formation of Al 20 Mn 2 Ce and Al 10 Mn 2 Ce phases. The phase analysis data was then used to improve the CALPHAD modeling of the liquidus projection and isothermal sections for the Al-rich Al-Ce-Ni-Mn quaternary system. Thermodynamic modeling and experimental analysis on phases in the AM sample of Al-Ce-Ni with Mn confirmed that the phases present are consistent with Mn-containing Al-Ce-Ni cast samples. Here, this investigation demonstrates the potential for using secondary alloying elements to drastically alter phase stability and microstructure in alloy systems.

36 MATERIALS SCIENCE↗
DOE OSTI2025

Corrosion analysis of Al-Ce-Ni and Al-Cu-Ce cast alloys in dilute boric acid at room and elevated temperatures

Two Al-Ce-Ni cast alloys, and an Al-Cu-Ce cast alloy, as candidate wet storage materials for spent nuclear fuels, were tested in 0.23 wt% H 3 BO 3 solution to assess the alloy corrosion resistance. Electrochemical and gravimetric corrosion data suggest that the three Al alloys are unlikely to undergo any severe corrosion in dilute H 3 BO 3 at or below 50 °C. Post-exposure characterization of the three Al alloys, including scanning and transmission electron microscopy and electron dispersive spectroscopy, revealed a corrosion product layer, mostly Al 2 O 3 , on the exposed surface and local penetration of oxygen into the alloy matrix. The degree of oxide layer growth and oxygen penetration is greater at 80 °C than the temperature at/below 50 °C. The Al-Cu-Ce alloy is considered less corrosion resistant than the other two alloys studied.

Al-Ce alloy↗
DOE OSTI2025

Shining light on nanoscale ‘vine-on-stick’ eutectic structures in the Al-Ce-Ni system

Multiphase eutectics often comprise entangled solid phases with nanoscale periodicity, making it difficult to unravel their 3D connectivity using conventional 2D techniques. Among such systems, the three-phase eutectic Al-Al 11 Ce 3 -Al 3 Ni stands out for its ultrafine (∼100 nm) interphase spacing and promising creep resistance, yet its microstructure remains relatively unexplored despite its potential for high-temperature applications. Here, we use scanning hard X-ray microscopy with an unprecedented ∼10 nm pixel size to resolve its 3D morphology. Reconstructions reveal a novel “vine-on-stick” motif, wherein Al 11 Ce 3 wraps around Al 3 Ni pillars. Analysis of phase tortuosities confirms that Al 11 Ce 3 exhibits more convoluted morphologies than Al 3 Ni. No orientation relationship was observed between the two intermetallics, suggesting that growth is controlled by local solute gradients rather than epitaxy. Fragmentation of intermetallics along their longitudinal axis suggests a Rayleigh-type breakup mechanism in solid state. The “vine-on-stick” pattern may generalize to other alloy systems with variable interfacial anisotropies and low mutual solubilities.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CeAlNi by Materials Project

CeNiAl crystallizes in the hexagonal P-62m space group. The structure is three-dimensional. Ce is bonded in a 5-coordinate geometry to five Ni and six equivalent Al atoms. There are four shorter (2.88 Å) and one longer (2.92 Å) Ce–Ni bond lengths. There are two shorter (3.11 Å) and four longer (3.24 Å) Ce–Al bond lengths. There are two inequivalent Ni sites. In the first Ni site, Ni is bonded in a 9-coordinate geometry to three equivalent Ce and six equivalent Al atoms. All Ni–Al bond lengths are 2.58 Å. In the second Ni site, Ni is bonded in a 9-coordinate geometry to six equivalent Ce and three equivalent Al atoms. All Ni–Al bond lengths are 2.71 Å. Al is bonded in a 12-coordinate geometry to six equivalent Ce, four Ni, and two equivalent Al atoms. Both Al–Al bond lengths are 2.77 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CeAl3Ni2 by Materials Project

CeNi2Al3 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Ce is bonded in a 6-coordinate geometry to six equivalent Ni and twelve equivalent Al atoms. All Ce–Ni bond lengths are 3.05 Å. All Ce–Al bond lengths are 3.33 Å. Ni is bonded in a 9-coordinate geometry to three equivalent Ce and six equivalent Al atoms. All Ni–Al bond lengths are 2.53 Å. Al is bonded to four equivalent Ce and four equivalent Ni atoms to form a mixture of distorted edge, face, and corner-sharing AlCe4Ni4 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CeAl4Ni by Materials Project

CeNiAl4 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Ce is bonded in a 9-coordinate geometry to two equivalent Ni and thirteen Al atoms. Both Ce–Ni bond lengths are 3.23 Å. There are a spread of Ce–Al bond distances ranging from 2.99–3.35 Å. Ni is bonded in a 7-coordinate geometry to two equivalent Ce and seven Al atoms. There are a spread of Ni–Al bond distances ranging from 2.32–2.50 Å. There are three inequivalent Al sites. In the first Al site, Al is bonded in a 10-coordinate geometry to four equivalent Ce and six Al atoms. There are four shorter (2.90 Å) and two longer (2.97 Å) Al–Al bond lengths. In the second Al site, Al is bonded in a 1-coordinate geometry to three equivalent Ce, one Ni, and four equivalent Al atoms. In the third Al site, Al is bonded in a 3-coordinate geometry to three equivalent Ce, three equivalent Ni, and one Al atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CeAl5Ni2 by Materials Project

CeNi2Al5 crystallizes in the orthorhombic Immm space group. The structure is three-dimensional. Ce is bonded in a 12-coordinate geometry to four equivalent Ni and fourteen Al atoms. All Ce–Ni bond lengths are 3.16 Å. There are a spread of Ce–Al bond distances ranging from 3.30–3.53 Å. Ni is bonded in a 9-coordinate geometry to two equivalent Ce and seven Al atoms. There are a spread of Ni–Al bond distances ranging from 2.30–2.53 Å. There are two inequivalent Al sites. In the first Al site, Al is bonded in a linear geometry to two equivalent Ce and two equivalent Ni atoms. In the second Al site, Al is bonded in a distorted trigonal non-coplanar geometry to three equivalent Ce and three equivalent Ni atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ce4Al23Ni6 by Materials Project

Ce4Ni6Al23 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are two inequivalent Ce sites. In the first Ce site, Ce is bonded in a 11-coordinate geometry to two equivalent Ni and thirteen Al atoms. Both Ce–Ni bond lengths are 3.26 Å. There are a spread of Ce–Al bond distances ranging from 3.06–3.41 Å. In the second Ce site, Ce is bonded in a 11-coordinate geometry to two equivalent Ni and thirteen Al atoms. Both Ce–Ni bond lengths are 3.29 Å. There are a spread of Ce–Al bond distances ranging from 3.07–3.38 Å. There are three inequivalent Ni sites. In the first Ni site, Ni is bonded in a 7-coordinate geometry to two equivalent Ce and seven Al atoms. There are a spread of Ni–Al bond distances ranging from 2.37–2.53 Å. In the second Ni site, Ni is bonded in a 7-coordinate geometry to nine Al atoms. There are a spread of Ni–Al bond distances ranging from 2.42–2.81 Å. In the third Ni site, Ni is bonded in a 10-coordinate geometry to two equivalent Ce and eight Al atoms. There are a spread of Ni–Al bond distances ranging from 2.39–2.55 Å. There are twelve inequivalent Al sites. In the first Al site, Al is bonded in a distorted bent 150 degrees geometry to two equivalent Ce, two Ni, and five Al atoms. There are a spread of Al–Al bond distances ranging from 2.72–2.89 Å. In the second Al site, Al is bonded in a distorted trigonal planar geometry to three Ni and two Al atoms. There are one shorter (2.72 Å) and one longer (2.73 Å) Al–Al bond lengths. In the third Al site, Al is bonded in a 12-coordinate geometry to four Ce and eight Al atoms. There are a spread of Al–Al bond distances ranging from 2.88–3.19 Å. In the fourth Al site, Al is bonded to two Ce, two equivalent Ni, and eight Al atoms to form distorted face-sharing AlCe2Al8Ni2 cuboctahedra. There are two shorter (2.74 Å) and one longer (2.84 Å) Al–Al bond lengths. In the fifth Al site, Al is bonded in a 3-coordinate geometry to one Ce, three equivalent Ni, and six Al atoms. There are two shorter (2.62 Å) and one longer (2.66 Å) Al–Al bond lengths. In the sixth Al site, Al is bonded in a 3-coordinate geometry to three equivalent Ce and three equivalent Ni atoms. In the seventh Al site, Al is bonded in a distorted bent 150 degrees geometry to three Ce, two Ni, and three Al atoms. In the eighth Al site, Al is bonded in a distorted single-bond geometry to three Ce, one Ni, and four Al atoms. Both Al–Al bond lengths are 2.91 Å. In the ninth Al site, Al is bonded in a 3-coordinate geometry to two equivalent Ce, three Ni, and one Al atom. In the tenth Al site, Al is bonded in a 2-coordinate geometry to three Ce, two equivalent Ni, and one Al atom. In the eleventh Al site, Al is bonded in a 12-coordinate geometry to four equivalent Ce and six Al atoms. In the twelfth Al site, Al is bonded in a distorted trigonal non-coplanar geometry to one Ce, three Ni, and one Al atom.

36 MATERIALS SCIENCE↗