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4 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Localized corrosion at nm-scale hardening precipitates in Al-Cu-Li alloys

The localized corrosion of Li-containing nm hardening precipitates in the 3rd generation of Al-Cu-Li alloys was investigated based on a quasi in situ approach by sequentially exposing the material to NaCl solution and characterizing the structural, chemical, and electrochemical evolution at atomic scale using electron microscopy, spectroscopy, 3D tomography, electrochemical measurements, and DFT calculations. Localized corrosion of Al 7.5 Cu 4 Li (TB phase) initiated along {001} family of planes through the dealloying of Al and Li due to a low surface work function. Cu was enriched along the Cu (110) // T B (011) // Al (100) orientations on and around corroded T B precipitates. No strong galvanic interactions were observed at the T B and Al matrix interface due to the formation of a Li-C-O rich passivation layer during electrolyte exposure. Similarities and differences between T B and other common Al-Cu-Li precipitates (Al 2 CuLi, Al 6 CuLi 3 , and Al 3 Li) with respect to corrosion are discussed. Overall, the reported corrosion mechanism can assist in the assessment of the localized corrosion susceptibility of precipitation-hardened Al alloys and assist in the design of new alloys.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LiAlCu2 by Materials Project

LiCu2Al is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Li is bonded in a body-centered cubic geometry to eight equivalent Cu and six equivalent Al atoms. All Li–Cu bond lengths are 2.55 Å. All Li–Al bond lengths are 2.94 Å. Cu is bonded in a body-centered cubic geometry to four equivalent Li and four equivalent Al atoms. All Cu–Al bond lengths are 2.55 Å. Al is bonded in a distorted body-centered cubic geometry to six equivalent Li and eight equivalent Cu atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Li4(AlCu2)3 by Materials Project

Li4(Cu2Al)3 is Frank-Kasper $\mu$ Phase-derived structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are four inequivalent Li sites. In the first Li site, Li is bonded in a 1-coordinate geometry to three equivalent Li, nine equivalent Cu, and four Al atoms. All Li–Li bond lengths are 2.93 Å. There are three shorter (2.79 Å) and six longer (2.97 Å) Li–Cu bond lengths. There are one shorter (2.62 Å) and three longer (2.86 Å) Li–Al bond lengths. In the second Li site, Li is bonded in a 1-coordinate geometry to three equivalent Li, nine equivalent Cu, and four Al atoms. There are three shorter (2.79 Å) and six longer (2.97 Å) Li–Cu bond lengths. There are one shorter (2.62 Å) and three longer (2.86 Å) Li–Al bond lengths. In the third Li site, Li is bonded in a 6-coordinate geometry to six equivalent Cu and six Al atoms. All Li–Cu bond lengths are 2.71 Å. All Li–Al bond lengths are 3.15 Å. In the fourth Li site, Li is bonded in a 6-coordinate geometry to six equivalent Cu and six Al atoms. All Li–Cu bond lengths are 2.72 Å. All Li–Al bond lengths are 3.15 Å. Cu is bonded to five Li, four equivalent Cu, and three Al atoms to form CuLi5Al3Cu4 cuboctahedra that share corners with two equivalent AlLi6Cu6 cuboctahedra, corners with thirteen equivalent CuLi5Al3Cu4 cuboctahedra, edges with five equivalent CuLi5Al3Cu4 cuboctahedra, faces with three equivalent AlLi6Cu6 cuboctahedra, and faces with ten equivalent CuLi5Al3Cu4 cuboctahedra. There are two shorter (2.42 Å) and two longer (2.48 Å) Cu–Cu bond lengths. There are one shorter (2.49 Å) and two longer (2.63 Å) Cu–Al bond lengths. There are four inequivalent Al sites. In the first Al site, Al is bonded to six Li and six equivalent Cu atoms to form AlLi6Cu6 cuboctahedra that share corners with twelve equivalent CuLi5Al3Cu4 cuboctahedra, edges with six equivalent AlLi6Cu6 cuboctahedra, and faces with eighteen equivalent CuLi5Al3Cu4 cuboctahedra. In the second Al site, Al is bonded in a 1-coordinate geometry to seven Li, six equivalent Cu, and one Al atom. All Al–Cu bond lengths are 2.63 Å. The Al–Al bond length is 2.74 Å. In the third Al site, Al is bonded in a 1-coordinate geometry to seven Li, six equivalent Cu, and one Al atom. The Al–Li bond length is 2.62 Å. The Al–Al bond length is 2.74 Å. In the fourth Al site, Al is bonded in a 1-coordinate geometry to seven Li, six equivalent Cu, and one Al atom. There are one shorter (2.62 Å) and six longer (3.15 Å) Al–Li bond lengths. All Al–Cu bond lengths are 2.63 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LiAl2Cu by Materials Project

Al2CuLi is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Li is bonded in a distorted body-centered cubic geometry to six equivalent Cu and eight equivalent Al atoms. All Li–Cu bond lengths are 3.01 Å. All Li–Al bond lengths are 2.60 Å. Cu is bonded in a distorted body-centered cubic geometry to six equivalent Li and eight equivalent Al atoms. All Cu–Al bond lengths are 2.60 Å. Al is bonded in a body-centered cubic geometry to four equivalent Li and four equivalent Cu atoms.

36 MATERIALS SCIENCE↗