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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Al3Ni by Materials Project

Al3Ni is Cementite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Ni is bonded in a 9-coordinate geometry to nine Al atoms. There are a spread of Ni–Al bond distances ranging from 2.43–2.70 Å. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 2-coordinate geometry to three equivalent Ni atoms. In the second Al site, Al is bonded in a 3-coordinate geometry to three equivalent Ni atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Gd(Al3Ni)3 by Materials Project

GdNi3Al9 crystallizes in the trigonal R32 space group. The structure is three-dimensional. Gd is bonded in a 11-coordinate geometry to six equivalent Ni and eleven Al atoms. There are three shorter (3.29 Å) and three longer (3.30 Å) Gd–Ni bond lengths. There are a spread of Gd–Al bond distances ranging from 3.00–3.17 Å. Ni is bonded in a 8-coordinate geometry to two equivalent Gd and eight Al atoms. There are a spread of Ni–Al bond distances ranging from 2.33–2.63 Å. There are six inequivalent Al sites. In the first Al site, Al is bonded in a distorted trigonal non-coplanar geometry to one Gd, three equivalent Ni, and seven Al atoms. There are a spread of Al–Al bond distances ranging from 2.77–2.84 Å. In the second Al site, Al is bonded in a 2-coordinate geometry to two equivalent Gd, two equivalent Ni, and six Al atoms. There are two shorter (2.63 Å) and four longer (2.81 Å) Al–Al bond lengths. In the third Al site, Al is bonded in a linear geometry to two equivalent Ni and six Al atoms. There are two shorter (2.81 Å) and two longer (2.84 Å) Al–Al bond lengths. In the fourth Al site, Al is bonded in a 3-coordinate geometry to two equivalent Gd, three equivalent Ni, and five Al atoms. There are one shorter (2.71 Å) and one longer (2.78 Å) Al–Al bond lengths. In the fifth Al site, Al is bonded in a distorted trigonal non-coplanar geometry to three equivalent Ni and seven Al atoms. The Al–Al bond length is 2.87 Å. In the sixth Al site, Al is bonded in a distorted trigonal non-coplanar geometry to one Gd, three equivalent Ni, and seven Al atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Er(Al3Ni)3 by Materials Project

ErNi3Al9 crystallizes in the trigonal R32 space group. The structure is three-dimensional. Er is bonded in a 11-coordinate geometry to six equivalent Ni and eleven Al atoms. There are three shorter (3.27 Å) and three longer (3.28 Å) Er–Ni bond lengths. There are a spread of Er–Al bond distances ranging from 2.98–3.15 Å. Ni is bonded in a 8-coordinate geometry to two equivalent Er and eight Al atoms. There are a spread of Ni–Al bond distances ranging from 2.33–2.62 Å. There are six inequivalent Al sites. In the first Al site, Al is bonded in a 3-coordinate geometry to two equivalent Er, three equivalent Ni, and five Al atoms. There are a spread of Al–Al bond distances ranging from 2.71–2.79 Å. In the second Al site, Al is bonded in a distorted trigonal non-coplanar geometry to one Er, three equivalent Ni, and seven Al atoms. There are three shorter (2.81 Å) and one longer (2.84 Å) Al–Al bond lengths. In the third Al site, Al is bonded in a 2-coordinate geometry to two equivalent Er, two equivalent Ni, and six Al atoms. Both Al–Al bond lengths are 2.64 Å. In the fourth Al site, Al is bonded in a distorted trigonal non-coplanar geometry to three equivalent Ni and seven Al atoms. There are three shorter (2.83 Å) and one longer (2.87 Å) Al–Al bond lengths. In the fifth Al site, Al is bonded in a distorted trigonal non-coplanar geometry to one Er, three equivalent Ni, and seven Al atoms. All Al–Al bond lengths are 2.80 Å. In the sixth Al site, Al is bonded in a linear geometry to two equivalent Ni and six Al atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2021

Microstructure and creep properties of cast near-eutectic Al–Ce–Ni alloys

This study investigates the as-cast and aged microstructures, thermal stability, ambient temperature strengthening, and creep resistance of three ternary Al–Ce–Ni alloys (wt%): near-eutectic Al–10Ce–5Ni (with both eutectic and hypoeutectic regions), hypoeutectic Al-7.5Ce-3.75Ni (with numerous primary Al dendrites), and hypereutectic Al-12.5Ce-6.25Ni (with coarse, blocky primary Al3Ni and Al11Ce3 precipitates and some primary Al dendrites). Depending on the alloy composition and local solidification conditions, the following eutectic morphologies are found: (i) coarse Al–Ce eutectic colonies where Al 11 Ce 3 is in the form of “Chinese script”, (ii) intermingled regions of binary Al–Ce and Al–Ni eutectic colonies, with finer Al 3 Ni and Al 11 Ce 3 fibers, (iii) large ternary eutectic colonies, where the binary Al 3 Ni and Al 11 Ce 3 phases are alternating or intertwining within the individual, fine fibers (diameters of ~60–170 nm, depending on solidification rates), and (iv) ternary eutectic zones (between primary Al dendrites), where fine Al 3 Ni and Al 11 Ce 3 build up a 3D-interconnected network. The high volume fraction of intermetallic phases and extremely fine eutectic spacing/fiber diameter both contribute to high ambient strengthening (higher as-cast microhardness than binary Al–Ce or Al–Ni), and also provide enhanced creep resistance at 300 and 350 °C. Additionally, the alloys are coarsening-resistant up to 425 °C for extended periods, with a gradual decrease in microhardness. The alloys aged at 400 °C to 1050 h show fiber fragmentation and coarsening of the resulting particles, with the faster-diffusing Ni driving more rapid coarsening of the Al 3 Ni particles which engulf finer, more stable Al 11 Ce 3 particles. Severe overaging (performed at 590 °C for 24 h) leads to Al 3 Ni and Al 11 Ce 3 spheroids which remain submicron-sized in eutectic colonies, but micron-sized at colony boundary and at Al dendrite-eutectic interface. Creep resistance at 300 °C of overaged Al–10Ce–5Ni remains substantial, consistent with load-transfer based composite strengthening being an important strengthening mechanism in these alloys, making them excellent candidates for replacement of heavier steel or titanium parts operating under stress up to 300 °C.

36 MATERIALS SCIENCE↗