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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Al3Fe by Materials Project

FeAl3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Fe is bonded to twelve equivalent Al atoms to form FeAl12 cuboctahedra that share corners with six equivalent FeAl12 cuboctahedra, corners with twelve equivalent AlAl8Fe4 cuboctahedra, edges with eighteen equivalent AlAl8Fe4 cuboctahedra, faces with eight equivalent FeAl12 cuboctahedra, and faces with twelve equivalent AlAl8Fe4 cuboctahedra. There are six shorter (2.66 Å) and six longer (2.69 Å) Fe–Al bond lengths. Al is bonded to four equivalent Fe and eight equivalent Al atoms to form AlAl8Fe4 cuboctahedra that share corners with four equivalent FeAl12 cuboctahedra, corners with fourteen equivalent AlAl8Fe4 cuboctahedra, edges with six equivalent FeAl12 cuboctahedra, edges with twelve equivalent AlAl8Fe4 cuboctahedra, faces with four equivalent FeAl12 cuboctahedra, and faces with sixteen equivalent AlAl8Fe4 cuboctahedra. There are a spread of Al–Al bond distances ranging from 2.61–2.76 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sm(Al3Fe)3 by Materials Project

Sm(FeAl3)3 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Sm is bonded in a 12-coordinate geometry to six Fe and fourteen Al atoms. There are two shorter (3.38 Å) and four longer (3.40 Å) Sm–Fe bond lengths. There are a spread of Sm–Al bond distances ranging from 3.08–3.36 Å. There are two inequivalent Fe sites. In the first Fe site, Fe is bonded in a 12-coordinate geometry to two equivalent Sm and ten Al atoms. There are a spread of Fe–Al bond distances ranging from 2.53–2.75 Å. In the second Fe site, Fe is bonded in a 12-coordinate geometry to two equivalent Sm, two equivalent Fe, and eight Al atoms. Both Fe–Fe bond lengths are 2.53 Å. There are a spread of Fe–Al bond distances ranging from 2.50–2.66 Å. There are three inequivalent Al sites. In the first Al site, Al is bonded in a 12-coordinate geometry to two equivalent Sm, three Fe, and seven Al atoms. There are a spread of Al–Al bond distances ranging from 2.65–2.91 Å. In the second Al site, Al is bonded in a 10-coordinate geometry to one Sm, three Fe, and six Al atoms. There are one shorter (2.74 Å) and one longer (2.78 Å) Al–Al bond lengths. In the third Al site, Al is bonded in a distorted linear geometry to two equivalent Sm, two equivalent Fe, and eight Al atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Ultrafine-grained Al-Mg-Zr Alloy Processed by Shear-Assisted Extrusion with High Thermal Stability

Shear-assisted processing and extrusion (ShAPE) is used to consolidate Al-4.2Mg-1.6Zr-0.25Si-0.1Fe (wt.%) powders. The extruded alloy exhibits: (i) near-zero porosity; (ii) an attractive combination of tensile yield strength (~220 MPa), ultimate strength (330 MPa) and elongation (>20%); and (iii) excellent thermal stability at 400 ºC. The ultra-fine grain size in the gas-atomized powders – created and stabilized by primary L12-Al3Zr submicron precipitates - is maintained after consolidation and subsequent exposure at 400 ºC, contributing twice as much to strength as Mg in solid-solution. Electron microscopy reveals the microstructure of the L12-Al3Zr precipitates, and other precipitates (Mg2Si and Al3Fe) and dispersoids (oxides).

ShAPE, Friction Extrusion, aluminum powder, Shear ↗