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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Zr5Al3 by Materials Project

Zr5Al3 crystallizes in the tetragonal I4/mcm space group. The structure is three-dimensional. there are two inequivalent Zr sites. In the first Zr site, Zr is bonded in a 6-coordinate geometry to two equivalent Zr and four equivalent Al atoms. Both Zr–Zr bond lengths are 2.70 Å. All Zr–Al bond lengths are 2.90 Å. In the second Zr site, Zr is bonded in a 6-coordinate geometry to six Al atoms. There are a spread of Zr–Al bond distances ranging from 2.92–3.14 Å. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 10-coordinate geometry to eight equivalent Zr and two equivalent Al atoms. Both Al–Al bond lengths are 2.70 Å. In the second Al site, Al is bonded in a distorted q6 geometry to ten Zr atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zr5Al3 by Materials Project

Zr5Al3 crystallizes in the hexagonal P6_3/mcm space group. The structure is three-dimensional. there are two inequivalent Zr sites. In the first Zr site, Zr is bonded in a 8-coordinate geometry to two equivalent Zr and six equivalent Al atoms. Both Zr–Zr bond lengths are 2.77 Å. All Zr–Al bond lengths are 2.92 Å. In the second Zr site, Zr is bonded in a 5-coordinate geometry to five equivalent Al atoms. There are a spread of Zr–Al bond distances ranging from 2.86–3.07 Å. Al is bonded in a 9-coordinate geometry to nine Zr atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2023

Development and characterization of a low-density TiNbZrAlTa refractory high entropy alloy with enhanced compressive strength and plasticity

A new refractory high entropy alloy (RHEA) is designed by combining refractory elements Nb and Ta with Ti, Zr, and Al, resulting in a (TiNbZr) 89 (AlTa) 11 alloy composition with a low-density of 6.0 g/cm 3 . The novel RHEA features a BCC matrix with B2 and Zr 5 Al 3 nano precipitates, exhibiting a compressive yield strength of ~890 MPa and specific yield strength of ~148.3 MPa g -1 cm 3 . Remarkably, the alloy demonstrates excellent compressive plasticity of ~70% at 298 K. As the temperature increases to 873 K, 1073 K, and 1273 K, the yield strength of the RHEA gradually decreases to ~610 MPa, ~ 210 MPa, and ~ 60 MPa, respectively. These results indicate that this novel RHEA showcases a combination of good specific strength and plasticity. Post-compression, B2, and Zr 5 Al 3 phases are observed. In conclusion, the second-phase particles dispersed throughout the grains hinder dislocation motion and contribute to the formation of sub-grain boundaries during hot compression.

36 MATERIALS SCIENCE↗