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5 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2024

TEM Characterization of Neutron Irradiated HfAl3-Al Composite Specimens

Particles comprised of a thermal neutron absorbing material (HfAl3) are dispersed in a metal matrix material with high thermal conductivity (aluminum) to conduct the heat generated by neutron capture away from the fuel and materials. This metal matrix composite is very promising for use as a conduction-cooled neutron absorber and has the potential to be useful as a shroud or heat sink for testing advanced fast reactor fuels and materials in an existing thermal reactor. To design and optimize the absorber block system for advanced reactor designs, fundamental understanding of the irradiation effect on material properties is necessary. This dataset contains TEM characterization results of neutron irradiated HfAl3-Al composite specimens. It is focused on the irradiation induced defects (dislocation lines and loops) characterization using the on-zone axis bright field STEM technique. This data was collected using a FEI Tecnai G2 F30 S/TEM at the Microscopy and Characterization Suite (MaCS), Center for Advanced Energy Studies (CAES).

Guillen, Donna↗
DOE OSTI2024

TEM Characterization of Neutron Irradiated HfAl3-Al Composite Specimens

Particles comprised of a thermal neutron absorbing material (HfAl3) are dispersed in a metal matrix material with high thermal conductivity (aluminum) to conduct the heat generated by neutron capture away from the fuel and materials. This metal matrix composite is very promising for use as a conduction-cooled neutron absorber and has the potential to be useful as a shroud or heat sink for testing advanced fast reactor fuels and materials in an existing thermal reactor. To design and optimize the absorber block system for advanced reactor designs, fundamental understanding of the irradiation effect on material properties is necessary. This dataset contains TEM characterization results of neutron irradiated HfAl3-Al composite specimens. It is focused on the irradiation induced defects (dislocation lines and loops) characterization using the on-zone axis bright field STEM technique. This data was collected using a FEI Tecnai G2 F30 S/TEM at the Microscopy and Characterization Suite (MaCS), Center for Advanced Energy Studies (CAES).

Guillen, Donna↗
DOE OSTI2020

Materials Data on HfAl3 by Materials Project

Al3Hf is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Hf is bonded to twelve Al atoms to form HfAl12 cuboctahedra that share corners with four equivalent HfAl12 cuboctahedra, edges with eight equivalent HfAl12 cuboctahedra, edges with sixteen equivalent AlHf4Al8 cuboctahedra, faces with four equivalent HfAl12 cuboctahedra, and faces with eight equivalent AlHf4Al8 cuboctahedra. There are four shorter (2.79 Å) and eight longer (2.98 Å) Hf–Al bond lengths. There are two inequivalent Al sites. In the first Al site, Al is bonded in a distorted square co-planar geometry to four equivalent Hf and eight equivalent Al atoms. All Al–Al bond lengths are 2.98 Å. In the second Al site, Al is bonded to four equivalent Hf and eight Al atoms to form AlHf4Al8 cuboctahedra that share corners with twelve equivalent AlHf4Al8 cuboctahedra, edges with eight equivalent HfAl12 cuboctahedra, edges with eight equivalent AlHf4Al8 cuboctahedra, faces with four equivalent HfAl12 cuboctahedra, and faces with ten equivalent AlHf4Al8 cuboctahedra. All Al–Al bond lengths are 2.79 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfAl3 by Materials Project

Al3Hf is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Hf is bonded to twelve Al atoms to form HfAl12 cuboctahedra that share corners with four equivalent AlHf4Al8 cuboctahedra, corners with eight equivalent HfAl12 cuboctahedra, edges with four equivalent HfAl12 cuboctahedra, edges with twenty AlHf4Al8 cuboctahedra, faces with five equivalent HfAl12 cuboctahedra, and faces with thirteen AlHf4Al8 cuboctahedra. There are a spread of Hf–Al bond distances ranging from 2.83–3.00 Å. There are three inequivalent Al sites. In the first Al site, Al is bonded to four equivalent Hf and eight Al atoms to form distorted AlHf4Al8 cuboctahedra that share corners with four equivalent HfAl12 cuboctahedra, corners with eight equivalent AlHf4Al8 cuboctahedra, edges with four equivalent HfAl12 cuboctahedra, edges with twenty AlHf4Al8 cuboctahedra, faces with five equivalent HfAl12 cuboctahedra, and faces with thirteen AlHf4Al8 cuboctahedra. There are four shorter (2.93 Å) and four longer (2.94 Å) Al–Al bond lengths. In the second Al site, Al is bonded to four equivalent Hf and eight Al atoms to form distorted AlHf4Al8 cuboctahedra that share corners with twelve AlHf4Al8 cuboctahedra, edges with eight equivalent HfAl12 cuboctahedra, edges with sixteen AlHf4Al8 cuboctahedra, faces with four equivalent HfAl12 cuboctahedra, and faces with fourteen AlHf4Al8 cuboctahedra. All Al–Al bond lengths are 2.83 Å. In the third Al site, Al is bonded to four equivalent Hf and eight Al atoms to form AlHf4Al8 cuboctahedra that share corners with twelve AlHf4Al8 cuboctahedra, edges with eight equivalent HfAl12 cuboctahedra, edges with sixteen AlHf4Al8 cuboctahedra, faces with four equivalent HfAl12 cuboctahedra, and faces with fourteen AlHf4Al8 cuboctahedra. All Al–Al bond lengths are 2.83 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfAl3 by Materials Project

Al3Hf is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Hf is bonded to twelve equivalent Al atoms to form HfAl12 cuboctahedra that share corners with twelve equivalent HfAl12 cuboctahedra, edges with twenty-four equivalent AlHf4Al8 cuboctahedra, faces with six equivalent HfAl12 cuboctahedra, and faces with twelve equivalent AlHf4Al8 cuboctahedra. All Hf–Al bond lengths are 2.89 Å. Al is bonded to four equivalent Hf and eight equivalent Al atoms to form AlHf4Al8 cuboctahedra that share corners with twelve equivalent AlHf4Al8 cuboctahedra, edges with eight equivalent HfAl12 cuboctahedra, edges with sixteen equivalent AlHf4Al8 cuboctahedra, faces with four equivalent HfAl12 cuboctahedra, and faces with fourteen equivalent AlHf4Al8 cuboctahedra. All Al–Al bond lengths are 2.89 Å.

36 MATERIALS SCIENCE↗