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At least 19 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2021

Mechanical Behavior of Al–Al2Cu–Si and Al–Al2Cu Eutectic Alloys

In this study, laser rapid solidification technique was used to refine the microstructure of ternary Al–Cu–Si and binary Al–Cu eutectic alloys to nanoscales. Micropillar compression testing was performed to measure the stress–strain response of the samples with characteristic microstructure in the melt pool regions. The laser-remelted Al–Al2Cu–Si ternary alloy was observed to reach the compressive strength of 1.59 GPa before failure at a strain of 28.5%, which is significantly better than the as-cast alloy with a maximum strength of 0.48 GPa at a failure strain of 4.8%. The laser-remelted Al–Cu binary alloy was observed to reach the compressive strength of 2.07 GPa before failure at a strain of 26.5%, which is significantly better than the as-cast alloy with maximum strength of 0.74 GPa at a failure strain of 3.3%. The enhanced compressive strength and improved compressive plasticity were interpreted in terms of microstructural refinement and hierarchical eutectic morphology.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Al2Cu by Materials Project

Al2Cu crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Cu is bonded in a body-centered cubic geometry to eight equivalent Al atoms. All Cu–Al bond lengths are 2.51 Å. Al is bonded in a 4-coordinate geometry to four equivalent Cu atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Al2Cu by Materials Project

Al2Cu is Khatyrkite structured and crystallizes in the tetragonal I4/mcm space group. The structure is three-dimensional. Cu is bonded in a 10-coordinate geometry to two equivalent Cu and eight equivalent Al atoms. Both Cu–Cu bond lengths are 2.41 Å. All Cu–Al bond lengths are 2.59 Å. Al is bonded in a 4-coordinate geometry to four equivalent Cu atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Al2Cu by Materials Project

Al2Cu is Fluorite structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Cu is bonded in a body-centered cubic geometry to eight equivalent Al atoms. All Cu–Al bond lengths are 2.50 Å. Al is bonded to four equivalent Cu atoms to form a mixture of corner and edge-sharing AlCu4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca(Al2Cu)4 by Materials Project

Ca(CuAl2)4 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ca is bonded in a 12-coordinate geometry to eight equivalent Cu and twelve Al atoms. All Ca–Cu bond lengths are 3.39 Å. There are four shorter (3.09 Å) and eight longer (3.22 Å) Ca–Al bond lengths. Cu is bonded to two equivalent Ca, two equivalent Cu, and eight Al atoms to form a mixture of distorted edge, face, and corner-sharing CuCa2Al8Cu2 cuboctahedra. Both Cu–Cu bond lengths are 2.56 Å. There are four shorter (2.57 Å) and four longer (2.70 Å) Cu–Al bond lengths. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 10-coordinate geometry to one Ca, four equivalent Cu, and five Al atoms. There are a spread of Al–Al bond distances ranging from 2.68–2.82 Å. In the second Al site, Al is bonded in a 12-coordinate geometry to two equivalent Ca, four equivalent Cu, and six Al atoms. Both Al–Al bond lengths are 2.76 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(Al2Cu)4 by Materials Project

Al8Cu4Y crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Y is bonded in a 12-coordinate geometry to eight equivalent Cu and twelve Al atoms. All Y–Cu bond lengths are 3.37 Å. There are four shorter (3.06 Å) and eight longer (3.21 Å) Y–Al bond lengths. Cu is bonded in a 12-coordinate geometry to two equivalent Y, two equivalent Cu, and eight Al atoms. Both Cu–Cu bond lengths are 2.57 Å. There are four shorter (2.56 Å) and four longer (2.69 Å) Cu–Al bond lengths. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 10-coordinate geometry to one Y, four equivalent Cu, and five Al atoms. There are one shorter (2.67 Å) and four longer (2.81 Å) Al–Al bond lengths. In the second Al site, Al is bonded in a 12-coordinate geometry to two equivalent Y, four equivalent Cu, and six Al atoms. Both Al–Al bond lengths are 2.73 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sm(Al2Cu)4 by Materials Project

Sm(CuAl2)4 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Sm is bonded in a 12-coordinate geometry to eight equivalent Cu and twelve Al atoms. All Sm–Cu bond lengths are 3.38 Å. There are four shorter (3.08 Å) and eight longer (3.23 Å) Sm–Al bond lengths. Cu is bonded to two equivalent Sm, two equivalent Cu, and eight Al atoms to form a mixture of distorted edge, face, and corner-sharing CuSm2Al8Cu2 cuboctahedra. Both Cu–Cu bond lengths are 2.58 Å. There are four shorter (2.57 Å) and four longer (2.70 Å) Cu–Al bond lengths. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 10-coordinate geometry to one Sm, four equivalent Cu, and five Al atoms. There are a spread of Al–Al bond distances ranging from 2.67–2.82 Å. In the second Al site, Al is bonded in a 12-coordinate geometry to two equivalent Sm, four equivalent Cu, and six Al atoms. Both Al–Al bond lengths are 2.75 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ce(Al2Cu)4 by Materials Project

Al8Cu4Ce crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ce is bonded in a 12-coordinate geometry to eight equivalent Cu and twelve Al atoms. All Ce–Cu bond lengths are 3.39 Å. There are four shorter (3.09 Å) and eight longer (3.22 Å) Ce–Al bond lengths. Cu is bonded to two equivalent Ce, two equivalent Cu, and eight Al atoms to form a mixture of distorted face, edge, and corner-sharing CuCe2Al8Cu2 cuboctahedra. Both Cu–Cu bond lengths are 2.56 Å. There are four shorter (2.58 Å) and four longer (2.71 Å) Cu–Al bond lengths. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 10-coordinate geometry to one Ce, four equivalent Cu, and five Al atoms. There are a spread of Al–Al bond distances ranging from 2.70–2.83 Å. In the second Al site, Al is bonded in a 12-coordinate geometry to two equivalent Ce, four equivalent Cu, and six Al atoms. Both Al–Al bond lengths are 2.76 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Np(Al2Cu)4 by Materials Project

Np(CuAl2)4 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Np is bonded in a 12-coordinate geometry to eight equivalent Cu and twelve Al atoms. All Np–Cu bond lengths are 3.37 Å. There are four shorter (3.04 Å) and eight longer (3.18 Å) Np–Al bond lengths. Cu is bonded in a 12-coordinate geometry to two equivalent Np, two equivalent Cu, and eight Al atoms. Both Cu–Cu bond lengths are 2.54 Å. There are four shorter (2.56 Å) and four longer (2.68 Å) Cu–Al bond lengths. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 10-coordinate geometry to one Np, four equivalent Cu, and five Al atoms. There are a spread of Al–Al bond distances ranging from 2.73–2.84 Å. In the second Al site, Al is bonded in a 12-coordinate geometry to two equivalent Np, four equivalent Cu, and four equivalent Al atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pr(Al2Cu)4 by Materials Project

Pr(CuAl2)4 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Pr is bonded in a 12-coordinate geometry to eight equivalent Cu and twelve Al atoms. All Pr–Cu bond lengths are 3.41 Å. There are four shorter (3.11 Å) and eight longer (3.27 Å) Pr–Al bond lengths. Cu is bonded to two equivalent Pr, two equivalent Cu, and eight Al atoms to form a mixture of distorted face, edge, and corner-sharing CuPr2Al8Cu2 cuboctahedra. Both Cu–Cu bond lengths are 2.60 Å. There are four shorter (2.59 Å) and four longer (2.73 Å) Cu–Al bond lengths. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 12-coordinate geometry to two equivalent Pr, four equivalent Cu, and six Al atoms. There are a spread of Al–Al bond distances ranging from 2.80–2.84 Å. In the second Al site, Al is bonded in a 10-coordinate geometry to one Pr, four equivalent Cu, and five Al atoms. The Al–Al bond length is 2.69 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tm(Al2Cu)4 by Materials Project

Tm(CuAl2)4 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Tm is bonded in a 12-coordinate geometry to eight equivalent Cu and twelve Al atoms. All Tm–Cu bond lengths are 3.36 Å. There are four shorter (3.05 Å) and eight longer (3.20 Å) Tm–Al bond lengths. Cu is bonded in a 12-coordinate geometry to two equivalent Tm, two equivalent Cu, and eight Al atoms. Both Cu–Cu bond lengths are 2.56 Å. There are four shorter (2.56 Å) and four longer (2.68 Å) Cu–Al bond lengths. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 12-coordinate geometry to two equivalent Tm, four equivalent Cu, and four equivalent Al atoms. There are two shorter (2.80 Å) and two longer (2.82 Å) Al–Al bond lengths. In the second Al site, Al is bonded in a 10-coordinate geometry to one Tm, four equivalent Cu, and five Al atoms. The Al–Al bond length is 2.68 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Gd(Al2Cu)4 by Materials Project

Gd(CuAl2)4 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Gd is bonded in a 12-coordinate geometry to eight equivalent Cu and twelve Al atoms. All Gd–Cu bond lengths are 3.37 Å. There are four shorter (3.06 Å) and eight longer (3.22 Å) Gd–Al bond lengths. Cu is bonded to two equivalent Gd, two equivalent Cu, and eight Al atoms to form a mixture of distorted corner, edge, and face-sharing CuGd2Al8Cu2 cuboctahedra. Both Cu–Cu bond lengths are 2.57 Å. There are four shorter (2.57 Å) and four longer (2.69 Å) Cu–Al bond lengths. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 12-coordinate geometry to two equivalent Gd, four equivalent Cu, and six Al atoms. There are two shorter (2.74 Å) and four longer (2.81 Å) Al–Al bond lengths. In the second Al site, Al is bonded in a 10-coordinate geometry to one Gd, four equivalent Cu, and five Al atoms. The Al–Al bond length is 2.69 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Nd(Al2Cu)4 by Materials Project

Al8Cu4Nd crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Nd is bonded in a 12-coordinate geometry to eight equivalent Cu and twelve Al atoms. All Nd–Cu bond lengths are 3.40 Å. There are four shorter (3.11 Å) and eight longer (3.26 Å) Nd–Al bond lengths. Cu is bonded to two equivalent Nd, two equivalent Cu, and eight Al atoms to form a mixture of distorted face, edge, and corner-sharing CuNd2Al8Cu2 cuboctahedra. Both Cu–Cu bond lengths are 2.60 Å. There are four shorter (2.59 Å) and four longer (2.72 Å) Cu–Al bond lengths. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 12-coordinate geometry to two equivalent Nd, four equivalent Cu, and six Al atoms. There are a spread of Al–Al bond distances ranging from 2.78–2.84 Å. In the second Al site, Al is bonded in a 10-coordinate geometry to one Nd, four equivalent Cu, and five Al atoms. The Al–Al bond length is 2.69 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Dy(Al2Cu)4 by Materials Project

Dy(CuAl2)4 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Dy is bonded in a 12-coordinate geometry to eight equivalent Cu and twelve Al atoms. All Dy–Cu bond lengths are 3.37 Å. There are four shorter (3.07 Å) and eight longer (3.21 Å) Dy–Al bond lengths. Cu is bonded in a 12-coordinate geometry to two equivalent Dy, two equivalent Cu, and eight Al atoms. Both Cu–Cu bond lengths are 2.57 Å. There are four shorter (2.56 Å) and four longer (2.69 Å) Cu–Al bond lengths. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 12-coordinate geometry to two equivalent Dy, four equivalent Cu, and six Al atoms. There are a spread of Al–Al bond distances ranging from 2.73–2.82 Å. In the second Al site, Al is bonded in a 10-coordinate geometry to one Dy, four equivalent Cu, and five Al atoms. The Al–Al bond length is 2.68 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tb(Al2Cu)4 by Materials Project

Tb(CuAl2)4 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Tb is bonded in a 12-coordinate geometry to eight equivalent Cu and twelve Al atoms. All Tb–Cu bond lengths are 3.38 Å. There are four shorter (3.07 Å) and eight longer (3.22 Å) Tb–Al bond lengths. Cu is bonded to two equivalent Tb, two equivalent Cu, and eight Al atoms to form a mixture of distorted edge, corner, and face-sharing CuTb2Al8Cu2 cuboctahedra. Both Cu–Cu bond lengths are 2.57 Å. There are four shorter (2.57 Å) and four longer (2.70 Å) Cu–Al bond lengths. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 10-coordinate geometry to one Tb, four equivalent Cu, and five Al atoms. There are a spread of Al–Al bond distances ranging from 2.70–2.83 Å. In the second Al site, Al is bonded in a 12-coordinate geometry to two equivalent Tb, four equivalent Cu, and six Al atoms. Both Al–Al bond lengths are 2.74 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Yb(Al2Cu)4 by Materials Project

YbCu4Al8 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Yb is bonded in a 12-coordinate geometry to eight equivalent Cu and twelve Al atoms. All Yb–Cu bond lengths are 3.38 Å. There are four shorter (3.07 Å) and eight longer (3.21 Å) Yb–Al bond lengths. Cu is bonded to two equivalent Yb, two equivalent Cu, and eight Al atoms to form a mixture of distorted edge, corner, and face-sharing CuYb2Al8Cu2 cuboctahedra. Both Cu–Cu bond lengths are 2.56 Å. There are four shorter (2.57 Å) and four longer (2.70 Å) Cu–Al bond lengths. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 10-coordinate geometry to one Yb, four equivalent Cu, and five Al atoms. There are a spread of Al–Al bond distances ranging from 2.70–2.83 Å. In the second Al site, Al is bonded in a 12-coordinate geometry to two equivalent Yb, four equivalent Cu, and six Al atoms. Both Al–Al bond lengths are 2.74 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2022

Dislocation-θ' (Al2Cu) interactions during creep deformation of an Al-Cu alloy

While precipitate-dislocation interactions are well-understood for Al-Cu alloys in tension, creep behavior has seen far less study. New, thermally-stabilized Al-Cu alloys have θ' (Al 2 Cu) as strengthening precipitates that remain stable up to 300 °C (~60% of the melting temperature) and higher, where creep becomes essential to the mechanical behavior. This investigation identifies the precipitate-dislocation interactions in such an Al-Cu alloy using in-situ neutron diffraction and scanning transmission electron microscopy. Significant load transfer to the θ' precipitates occurs, which can be attributed to dislocation loops on the interfaces of θ' and the Al matrix. Thus, Orowan looping is identified to be the primary activity for precipitate-dislocation interactions. As Orowan looping and load transfer are associated with significant strain hardening, these results explain the excellent creep resistance seen in this alloy, and provide insights into the design of precipitation strengthened alloys with superior creep performance.

36 MATERIALS SCIENCE↗