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At least 37 records · Page 2
All sourcesNASA NTRSDOE OSTI
DOE OSTI2023

Progression of creep deformation from grain boundaries to grain interior in Al-Cu-Mn-Zr alloys

Creep mechanisms are studied in θ'-Al 2 Cu-strengthened Al-Cu-Mn-Zr alloys at 300 and 350°C for (i) ACMZ, a base alloy without further alloying elements and (ii) RR350, a commercial alloy with additions of Ni and Co forming distinct grain-boundary precipitates. At high stresses, creep is dominated by dislocations bypassing θ' precipitates within grains via the Orowan mechanism, as evidenced by (i) very high stress exponent (n~20-25) and (ii) α-Al and θ' lattice strains (measured via in-situ neutron diffraction) evolving during creep in a manner consistent with load transfer from the plastically-deforming α-Al matrix to elastically-deforming θ' precipitates. At intermediate stresses, both alloys exhibit a n~3 regime, where α-Al and θ' lattice strains scale near-linearly with applied stress while remaining largely unaffected by strain accumulation, indicating that Orowan looping or dislocation pile-up around θ' is now inactive within the grains. Rather, dislocation motion occurs solely in θ'-precipitate-free zones (θ'-PFZ) where high dislocation densities are observed via TEM after creep deformation. Plastic flow at θ'-PFZ and/or localized pipe diffusion are expected to enable grain-boundary sliding (GBS), which is proposed as the rate-limiting mechanism in the n~3 regime. Ni/Co-rich precipitates at RR350 grain-boundaries, with negligible θ'-PFZ around them, share load (as determined via neutron diffraction) with the α-Al matrix more effectively than θ-Al 2 Cu precipitates at ACMZ grain-boundaries, with wide surrounding θ'-PFZ. So, high creep resistance in the n~3 GBS regime of RR350 is enabled by coarsening-resistant grain-boundary precipitates, forming without concomitant development of weak θ'-PFZ, which effectively share load with the grains.

36 MATERIALS SCIENCE↗
DOE OSTI2023

Microstructural evolution of rapidly solidified hypoeutectic Al 10Cu alloy during non-isothermal annealing transients induced by nano-second laser pulses

The evolution of characteristic nonequilibrium features presenting in morphologically distinct regions of rapid solidification (RS) microstructures in a hypoeutectic Al—10Cu (atomic %) in response to non-isothermal annealing transients has been studied by transmission electron microscopy (TEM). The capabilities of the Movie-Mode Dynamic TEM (MM-DTEM) instrument were used to expose select regions of the RS microstructure to sequences of rapid heating and cooling transients induced by nanosecond laser pulses while permitting in-situ observation. Partial melting, microstructural scale coarsening, morphological changes of the nonequilibrium features in the multi-phase RS microstructure, and solid-state phase transformation were observed. Heterogeneous nucleation of nanoscale θ-Al 2 Cu phase involved metastable supersaturated α-Al and the θ'-Al 2 Cu phases, establishing different sets of orientation relationships for the stable θ-Al 2 Cu and α-Al phases. Replacement of banded morphology grains that formed under conditions driven farthest from equilibrium by an equiaxed nanocrystalline structure comprised of α-Al phase, the primary solidification product, and an intergranular network of Al 2 Cu crystals has been attributed to local remelting. Here the experimental approach explored, permitted discovery of mechanistic details of location-specific transformation pathways activated in the multi-phase RS microstructure of hypoeutectic Al—Cu during subsequent nonisothermal transients.

36 MATERIALS SCIENCE↗
DOE OSTI2022

Effect of grain-boundary θ-Al 2 Cu precipitates on tensile and compressive creep properties of cast Al–Cu–Mn–Zr alloys

Tensile and compressive creep tests were performed at 300 °C on high-temperature Al–Cu–Mn–Zr (ACMZ) alloys with 6 wt% Cu (6Cu) and 9 wt% Cu (9Cu) to evaluate the effect on creep properties of micron-size θ-Al 2 Cu intergranular precipitates. For compressive creep, the increased volume fraction of θ-precipitates at grain boundaries (from ~0.7% in 6Cu to ~ 6% in 9Cu) does not affect deformation rates across the investigated stress range of 15–110 MPa, consistent with creep being controlled by submicron θ'-Al 2 Cu precipitates within grains, whose size and fractions are the same in both alloys. In contrast, for tensile creep, 9Cu creeps faster than 6Cu at stresses above 20 MPa, and this difference increases with the stress level. Additionally, this discrepancy between tensile and compressive creep behavior is explained by cavitation during tensile creep, which is favored by higher volume fraction and larger size of intergranular θ precipitates in 9Cu. Conversely, larger precipitates impede cavity linkage resulting in improved creep ductility of 9Cu as compared to 6Cu at 300 °C.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Al3Cu2 by Materials Project

Cu2Al3 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. Cu is bonded in a body-centered cubic geometry to eight Al atoms. There are a spread of Cu–Al bond distances ranging from 2.46–2.58 Å. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 6-coordinate geometry to six equivalent Cu atoms. In the second Al site, Al is bonded in a 5-coordinate geometry to five equivalent Cu atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on AlCu3 by Materials Project

Cu3Al is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. there are two inequivalent Cu sites. In the first Cu site, Cu is bonded in a 8-coordinate geometry to eight equivalent Cu and six equivalent Al atoms. All Cu–Cu bond lengths are 2.53 Å. All Cu–Al bond lengths are 2.92 Å. In the second Cu site, Cu is bonded in a distorted body-centered cubic geometry to four equivalent Cu and four equivalent Al atoms. All Cu–Al bond lengths are 2.53 Å. Al is bonded in a distorted body-centered cubic geometry to fourteen Cu atoms.

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 AlCu3 by Materials Project

Cu3Al is beta Cu3Ti structured and crystallizes in the orthorhombic Pmmn space group. The structure is three-dimensional. there are two inequivalent Cu sites. In the first Cu site, Cu is bonded to eight equivalent Cu and four equivalent Al atoms to form CuAl4Cu8 cuboctahedra that share corners with eight equivalent AlCu12 cuboctahedra, corners with ten CuAl4Cu8 cuboctahedra, edges with eighteen CuAl4Cu8 cuboctahedra, faces with six equivalent AlCu12 cuboctahedra, and faces with fourteen CuAl4Cu8 cuboctahedra. There are a spread of Cu–Cu bond distances ranging from 2.59–2.61 Å. There are two shorter (2.59 Å) and two longer (2.60 Å) Cu–Al bond lengths. In the second Cu site, Cu is bonded to eight Cu and four equivalent Al atoms to form CuAl4Cu8 cuboctahedra that share corners with four equivalent AlCu12 cuboctahedra, corners with fourteen CuAl4Cu8 cuboctahedra, edges with six equivalent AlCu12 cuboctahedra, edges with twelve CuAl4Cu8 cuboctahedra, faces with four equivalent AlCu12 cuboctahedra, and faces with sixteen CuAl4Cu8 cuboctahedra. There are a spread of Cu–Cu bond distances ranging from 2.58–2.60 Å. There are a spread of Cu–Al bond distances ranging from 2.59–2.61 Å. Al is bonded to twelve Cu atoms to form AlCu12 cuboctahedra that share corners with two equivalent AlCu12 cuboctahedra, corners with sixteen CuAl4Cu8 cuboctahedra, edges with six equivalent AlCu12 cuboctahedra, edges with twelve equivalent CuAl4Cu8 cuboctahedra, faces with six equivalent AlCu12 cuboctahedra, and faces with fourteen CuAl4Cu8 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on AlCu by Materials Project

CuAl crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are three inequivalent Cu sites. In the first Cu site, Cu is bonded in a 6-coordinate geometry to four Cu and six Al atoms. There are two shorter (2.56 Å) and two longer (2.57 Å) Cu–Cu bond lengths. There are four shorter (2.51 Å) and two longer (2.62 Å) Cu–Al bond lengths. In the second Cu site, Cu is bonded in a 11-coordinate geometry to four Cu and seven Al atoms. There are two shorter (2.64 Å) and one longer (2.66 Å) Cu–Cu bond lengths. There are a spread of Cu–Al bond distances ranging from 2.40–2.79 Å. In the third Cu site, Cu is bonded in a 11-coordinate geometry to four Cu and seven Al atoms. There are a spread of Cu–Al bond distances ranging from 2.52–2.68 Å. There are three inequivalent Al sites. In the first Al site, Al is bonded in a 6-coordinate geometry to six Cu atoms. In the second Al site, Al is bonded in a 6-coordinate geometry to six Cu atoms. In the third Al site, Al is bonded in a 8-coordinate geometry to eight Cu atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Al4Cu9 by Materials Project

Al4Cu9 is gamma-brass-like structured and crystallizes in the cubic P-43m space group. The structure is three-dimensional. there are six inequivalent Cu sites. In the first Cu site, Cu is bonded in a 12-coordinate geometry to six Cu and six Al atoms. There are three shorter (2.51 Å) and three longer (2.64 Å) Cu–Cu bond lengths. There are three shorter (2.59 Å) and three longer (2.60 Å) Cu–Al bond lengths. In the second Cu site, Cu is bonded in a 12-coordinate geometry to nine Cu and three equivalent Al atoms. There are a spread of Cu–Cu bond distances ranging from 2.53–2.61 Å. All Cu–Al bond lengths are 2.58 Å. In the third Cu site, Cu is bonded in a distorted trigonal planar geometry to nine Cu and three equivalent Al atoms. There are three shorter (2.57 Å) and three longer (2.66 Å) Cu–Cu bond lengths. All Cu–Al bond lengths are 2.46 Å. In the fourth Cu site, Cu is bonded in a 4-coordinate geometry to seven Cu and six Al atoms. There are one shorter (2.51 Å) and four longer (2.79 Å) Cu–Cu bond lengths. There are four shorter (2.53 Å) and two longer (2.81 Å) Cu–Al bond lengths. In the fifth Cu site, Cu is bonded in a 9-coordinate geometry to nine Cu and four equivalent Al atoms. There are a spread of Cu–Cu bond distances ranging from 2.47–2.73 Å. All Cu–Al bond lengths are 2.74 Å. In the sixth Cu site, Cu is bonded in a 5-coordinate geometry to six Cu and five Al atoms. There are a spread of Cu–Al bond distances ranging from 2.53–2.60 Å. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 9-coordinate geometry to nine Cu atoms. In the second Al site, Al is bonded in a 11-coordinate geometry to eleven 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 Al3Cu by Materials Project

CuAl3 crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Cu is bonded in a distorted body-centered cubic geometry to eight equivalent Al atoms. All Cu–Al bond lengths are 2.62 Å. There are two inequivalent Al sites. In the first Al site, Al is bonded to twelve Al atoms to form AlAl12 cuboctahedra that share corners with twenty AlAl12 cuboctahedra, edges with eight equivalent AlAl4Cu4 cuboctahedra, and faces with eight equivalent AlAl12 cuboctahedra. There are four shorter (2.83 Å) and eight longer (2.86 Å) Al–Al bond lengths. In the second Al site, Al is bonded to four equivalent Cu and four equivalent Al atoms to form distorted AlAl4Cu4 cuboctahedra that share corners with sixteen AlAl12 cuboctahedra, edges with sixteen AlAl12 cuboctahedra, and faces with six equivalent AlAl4Cu4 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on AlCu3 by Materials Project

Cu3Al is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Cu is bonded to eight equivalent Cu and four equivalent Al atoms to form CuAl4Cu8 cuboctahedra that share corners with twelve equivalent CuAl4Cu8 cuboctahedra, edges with eight equivalent AlCu12 cuboctahedra, edges with sixteen equivalent CuAl4Cu8 cuboctahedra, faces with four equivalent AlCu12 cuboctahedra, and faces with fourteen equivalent CuAl4Cu8 cuboctahedra. All Cu–Cu bond lengths are 2.60 Å. All Cu–Al bond lengths are 2.60 Å. Al is bonded to twelve equivalent Cu atoms to form AlCu12 cuboctahedra that share corners with twelve equivalent AlCu12 cuboctahedra, edges with twenty-four equivalent CuAl4Cu8 cuboctahedra, faces with six equivalent AlCu12 cuboctahedra, and faces with twelve equivalent CuAl4Cu8 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on AlCu by Materials Project

CuAl is Tetraauricupride structured and crystallizes in the cubic Pm-3m 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 2.60 Å. Al is bonded in a body-centered cubic geometry to eight equivalent Cu atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Al3Cu by Materials Project

CuAl3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Cu is bonded to twelve equivalent Al atoms to form CuAl12 cuboctahedra that share corners with twelve equivalent CuAl12 cuboctahedra, edges with twenty-four equivalent AlAl8Cu4 cuboctahedra, faces with six equivalent CuAl12 cuboctahedra, and faces with twelve equivalent AlAl8Cu4 cuboctahedra. All Cu–Al bond lengths are 2.77 Å. Al is bonded to four equivalent Cu and eight equivalent Al atoms to form AlAl8Cu4 cuboctahedra that share corners with twelve equivalent AlAl8Cu4 cuboctahedra, edges with eight equivalent CuAl12 cuboctahedra, edges with sixteen equivalent AlAl8Cu4 cuboctahedra, faces with four equivalent CuAl12 cuboctahedra, and faces with fourteen equivalent AlAl8Cu4 cuboctahedra. All Al–Al bond lengths are 2.77 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on AlCu3 by Materials Project

Cu3Al is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Cu is bonded to eight equivalent Cu and four equivalent Al atoms to form CuAl4Cu8 cuboctahedra that share corners with four equivalent AlCu12 cuboctahedra, corners with fourteen equivalent CuAl4Cu8 cuboctahedra, edges with six equivalent AlCu12 cuboctahedra, edges with twelve equivalent CuAl4Cu8 cuboctahedra, faces with four equivalent AlCu12 cuboctahedra, and faces with sixteen equivalent CuAl4Cu8 cuboctahedra. There are six shorter (2.59 Å) and two longer (2.62 Å) Cu–Cu bond lengths. All Cu–Al bond lengths are 2.60 Å. Al is bonded to twelve equivalent Cu atoms to form AlCu12 cuboctahedra that share corners with six equivalent AlCu12 cuboctahedra, corners with twelve equivalent CuAl4Cu8 cuboctahedra, edges with eighteen equivalent CuAl4Cu8 cuboctahedra, faces with eight equivalent AlCu12 cuboctahedra, and faces with twelve equivalent CuAl4Cu8 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on AlCu4 by Materials Project

AlCu4 crystallizes in the cubic P2_13 space group. The structure is three-dimensional. there are two inequivalent Cu sites. In the first Cu site, Cu is bonded in a 12-coordinate geometry to nine Cu and three equivalent Al atoms. There are a spread of Cu–Cu bond distances ranging from 2.53–2.67 Å. There are a spread of Cu–Al bond distances ranging from 2.56–2.68 Å. In the second Cu site, Cu is bonded in a 3-coordinate geometry to nine equivalent Cu and three equivalent Al atoms. All Cu–Al bond lengths are 2.36 Å. Al is bonded to twelve Cu atoms to form a mixture of distorted corner and face-sharing AlCu12 cuboctahedra.

36 MATERIALS SCIENCE↗