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4 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2025

Quantitative assessment of Ni + and He + ion irradiation damage in a tungsten heavy alloy under the simulated nuclear fusion environment

A 90W-7Ni-3Fe (wt.%) tungsten heavy alloy has been sequentially Ni + and He + ion irradiated at 700 °C to simulate the high temperature irradiation environment of a fusion reactor interior. W/Ni–Fe-W dual-phase alloys have been proposed to serve as plasma facing materials and require detailed investigation of their behavior under fusion relevant conditions to assess their overall applicability. To evaluate material performance under five years of simulated fusion reactor service, microstructural characterization of the nanoscale defect distribution has been performed on both constituent phases, revealing peak swelling in the W phase of approximately 0.03%. The γ-phase (Ni–Fe-W) is found to swell approximately 0.68% under the same irradiation conditions, indicating significant cavity formation and growth. Additionally, a novel multi-projection imaging approach has been applied to determine the extent of damage segregation along the dual-phase W-to-γ interface and exposes that these interfaces act as sink sites for the accumulation of cavities. Interphase boundaries are noted to possess an 11.8% areal coverage of defects along the boundary plane, primarily on the γ-phase side of the boundary. The accumulation of cavities at these interphase boundaries is anticipated to adversely affect overall material toughness, and this work reveals a pressing need for mechanical property testing of irradiated W–Ni-Fe dual-phase alloys.

70 PLASMA PHYSICS AND FUSION TECHNOLOGY↗
DOE OSTI2020

Materials Data on Fe7W6 by Materials Project

Fe7W6 is Frank-Kasper $\mu$ Phase structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are three inequivalent W sites. In the first W site, W is bonded in a 6-coordinate geometry to six equivalent W and six equivalent Fe atoms. There are three shorter (3.02 Å) and three longer (3.05 Å) W–W bond lengths. There are three shorter (2.71 Å) and three longer (2.76 Å) W–Fe bond lengths. In the second W site, W is bonded in a 12-coordinate geometry to four W and twelve Fe atoms. There are one shorter (2.67 Å) and three longer (2.86 Å) W–W bond lengths. There are a spread of W–Fe bond distances ranging from 2.72–2.86 Å. In the third W site, W is bonded in a 6-coordinate geometry to eight W and six equivalent Fe atoms. The W–W bond length is 2.56 Å. All W–Fe bond lengths are 2.62 Å. There are two inequivalent Fe sites. In the first Fe site, Fe is bonded to six equivalent W and six equivalent Fe atoms to form FeFe6W6 cuboctahedra that share corners with twelve equivalent FeFe5W7 cuboctahedra, edges with six equivalent FeFe6W6 cuboctahedra, and faces with eighteen equivalent FeFe5W7 cuboctahedra. All Fe–Fe bond lengths are 2.41 Å. In the second Fe site, Fe is bonded to seven W and five Fe atoms to form FeFe5W7 cuboctahedra that share corners with fifteen FeFe6W6 cuboctahedra, edges with five equivalent FeFe5W7 cuboctahedra, and faces with thirteen FeFe6W6 cuboctahedra. There are two shorter (2.36 Å) and two longer (2.40 Å) Fe–Fe bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Fe2W by Materials Project

Fe2W is Hexagonal Laves structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. W is bonded in a 12-coordinate geometry to four equivalent W and twelve Fe atoms. There are one shorter (2.83 Å) and three longer (2.91 Å) W–W bond lengths. There are a spread of W–Fe bond distances ranging from 2.73–2.81 Å. There are two inequivalent Fe sites. In the first Fe site, Fe is bonded to six equivalent W and six equivalent Fe atoms to form a mixture of face, edge, and corner-sharing FeFe6W6 cuboctahedra. All Fe–Fe bond lengths are 2.39 Å. In the second Fe site, Fe is bonded to six equivalent W and six Fe atoms to form a mixture of face, edge, and corner-sharing FeFe6W6 cuboctahedra. There are two shorter (2.29 Å) and two longer (2.39 Å) Fe–Fe bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Fe74W13 by Materials Project

W13Fe74 is alpha-derived structured and crystallizes in the orthorhombic Fmm2 space group. The structure is three-dimensional. there are six inequivalent W sites. In the first W site, W is bonded in a 3-coordinate geometry to sixteen Fe atoms. There are a spread of W–Fe bond distances ranging from 2.51–3.00 Å. In the second W site, W is bonded in a 3-coordinate geometry to one W and fifteen Fe atoms. The W–W bond length is 2.86 Å. There are a spread of W–Fe bond distances ranging from 2.51–2.98 Å. In the third W site, W is bonded in a 3-coordinate geometry to sixteen Fe atoms. There are a spread of W–Fe bond distances ranging from 2.52–2.99 Å. In the fourth W site, W is bonded in a 3-coordinate geometry to one W and fifteen Fe atoms. The W–W bond length is 2.86 Å. There are a spread of W–Fe bond distances ranging from 2.51–2.98 Å. In the fifth W site, W is bonded in a 3-coordinate geometry to sixteen Fe atoms. There are a spread of W–Fe bond distances ranging from 2.52–3.00 Å. In the sixth W site, W is bonded in a 12-coordinate geometry to four W and twelve Fe atoms. There are two shorter (2.76 Å) and ten longer (2.77 Å) W–Fe bond lengths. There are twenty-three inequivalent Fe sites. In the first Fe site, Fe is bonded to three W and nine Fe atoms to form distorted FeFe9W3 cuboctahedra that share corners with six FeFe9W3 cuboctahedra, a cornercorner with one FeFe12W4 tetrahedra, edges with eight FeFe9W3 cuboctahedra, faces with eleven FeFe9W3 cuboctahedra, and a faceface with one FeFe12W4 tetrahedra. There are a spread of Fe–Fe bond distances ranging from 2.33–2.77 Å. In the second Fe site, Fe is bonded to four W and eight Fe atoms to form distorted FeFe8W4 cuboctahedra that share corners with six FeFe9W3 cuboctahedra, edges with eight FeFe8W4 cuboctahedra, and faces with eleven FeFe8W4 cuboctahedra. There are a spread of Fe–Fe bond distances ranging from 2.32–2.60 Å. In the third Fe site, Fe is bonded to three W and nine Fe atoms to form distorted FeFe9W3 cuboctahedra that share corners with six FeFe9W3 cuboctahedra, a cornercorner with one FeFe12W4 tetrahedra, edges with eight FeFe9W3 cuboctahedra, faces with eleven FeFe9W3 cuboctahedra, and a faceface with one FeFe12W4 tetrahedra. There are a spread of Fe–Fe bond distances ranging from 2.33–2.76 Å. In the fourth Fe site, Fe is bonded to four W and eight Fe atoms to form a mixture of distorted corner, edge, and face-sharing FeFe8W4 cuboctahedra. There are a spread of Fe–Fe bond distances ranging from 2.33–2.62 Å. In the fifth Fe site, Fe is bonded to three W and nine Fe atoms to form distorted FeFe9W3 cuboctahedra that share corners with six FeFe9W3 cuboctahedra, a cornercorner with one FeFe12W4 tetrahedra, edges with eight FeFe8W4 cuboctahedra, faces with eleven FeFe9W3 cuboctahedra, and a faceface with one FeFe12W4 tetrahedra. There are a spread of Fe–Fe bond distances ranging from 2.33–2.76 Å. In the sixth Fe site, Fe is bonded to three W and nine Fe atoms to form distorted FeFe9W3 cuboctahedra that share corners with six equivalent FeFe9W3 cuboctahedra, a cornercorner with one FeFe12W4 tetrahedra, edges with eight FeFe9W3 cuboctahedra, faces with eleven FeFe9W3 cuboctahedra, and a faceface with one FeFe12W4 tetrahedra. There are a spread of Fe–Fe bond distances ranging from 2.32–2.76 Å. In the seventh Fe site, Fe is bonded to three W and nine Fe atoms to form distorted FeFe9W3 cuboctahedra that share corners with six FeFe9W3 cuboctahedra, edges with eight FeFe9W3 cuboctahedra, faces with eleven FeFe9W3 cuboctahedra, and a faceface with one FeFe12W4 tetrahedra. There are a spread of Fe–Fe bond distances ranging from 2.36–2.77 Å. In the eighth Fe site, Fe is bonded to four W and eight Fe atoms to form distorted FeFe8W4 cuboctahedra that share corners with six FeFe9W3 cuboctahedra, a cornercorner with one FeFe12W4 tetrahedra, edges with eight FeFe8W4 cuboctahedra, and faces with eleven FeFe8W4 cuboctahedra. There are a spread of Fe–Fe bond distances ranging from 2.33–2.62 Å. In the ninth Fe site, Fe is bonded to three W and nine Fe atoms to form distorted FeFe9W3 cuboctahedra that share corners with six FeFe9W3 cuboctahedra, a cornercorner with one FeFe12W4 tetrahedra, edges with eight FeFe9W3 cuboctahedra, faces with eleven FeFe9W3 cuboctahedra, and a faceface with one FeFe12W4 tetrahedra. There are a spread of Fe–Fe bond distances ranging from 2.35–2.76 Å. In the tenth Fe site, Fe is bonded to three W and nine Fe atoms to form distorted FeFe9W3 cuboctahedra that share corners with six FeFe9W3 cuboctahedra, edges with eight FeFe9W3 cuboctahedra, faces with eleven FeFe9W3 cuboctahedra, and a faceface with one FeFe12W4 tetrahedra. There are a spread of Fe–Fe bond distances ranging from 2.35–2.77 Å. In the eleventh Fe site, Fe is bonded to four W and eight Fe atoms to form distorted FeFe8W4 cuboctahedra that share corners with six FeFe8W4 cuboctahedra, a cornercorner with one FeFe12W4 tetrahedra, edges with eight FeFe9W3 cuboctahedra, and faces with eleven FeFe9W3 cuboctahedra. There are a spread of Fe–Fe bond distances ranging from 2.35–2.62 Å. In the twelfth Fe site, Fe is bonded to four W and twelve Fe atoms to form a mixture of distorted corner and face-sharing FeFe12W4 tetrahedra. In the thirteenth Fe site, Fe is bonded in a 1-coordinate geometry to two equivalent W and eleven Fe atoms. There are a spread of Fe–Fe bond distances ranging from 2.55–2.68 Å. In the fourteenth Fe site, Fe is bonded in a 1-coordinate geometry to two equivalent W and eleven Fe atoms. There are a spread of Fe–Fe bond distances ranging from 2.53–2.68 Å. In the fifteenth Fe site, Fe is bonded in a 1-coordinate geometry to two W and eleven Fe atoms. There are a spread of Fe–Fe bond distances ranging from 2.55–2.68 Å. In the sixteenth Fe site, Fe is bonded in a 1-coordinate geometry to two W and eleven Fe atoms. There are a spread of Fe–Fe bond distances ranging from 2.54–2.68 Å. In the seventeenth Fe site, Fe is bonded in a 1-coordinate geometry to two W and eleven Fe atoms. There are a spread of Fe–Fe bond distances ranging from 2.55–2.69 Å. In the eighteenth Fe site, Fe is bonded in a 1-coordinate geometry to two equivalent W and eleven Fe atoms. Both Fe–Fe bond lengths are 2.68 Å. In the nineteenth Fe site, Fe is bonded in a 1-coordinate geometry to two W and eleven Fe atoms. Both Fe–Fe bond lengths are 2.68 Å. In the twentieth Fe site, Fe is bonded in a 1-coordinate geometry to two W and eleven Fe atoms. Both Fe–Fe bond lengths are 2.69 Å. In the twenty-first Fe site, Fe is bonded in a 1-coordinate geometry to two W and eleven Fe atoms. The Fe–Fe bond length is 2.55 Å. In the twenty-second Fe site, Fe is bonded in a 1-coordinate geometry to two W and eleven Fe atoms. The Fe–Fe bond length is 2.55 Å. In the twenty-third Fe site, Fe is bonded in a 1-coordinate geometry to two W and eleven Fe atoms.

36 MATERIALS SCIENCE↗