Formation of Metastable Aluminides in Al–Sc–Ti (Zr, Hf) Cast Alloys

Попова, Э. А.; Kotenkov, P. V.; Шубин, А. Б.; Gilev, I. O.

doi:10.1007/s12540-019-00397-x

Cited by 14 publications

(4 citation statements)

References 27 publications

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“…The cruciform geometry of Al 3 Ti core in Fig. 2 correlates well with literature report on typical morphology characteristics of trialuminides 37,38 . L1 2 Al 3 Ti can also be fabricated via mechanical alloying with or without a ternary element 30,39 .…”

Section: Discussionsupporting

confidence: 87%

RETRACTED: Additive manufacturing of an ultrastrong, deformable Al alloy with nanoscale intermetallics

Zhang

Shang

Stegman

et al. 2023

Preprint

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Light-weight, high-strength, aluminum (Al) alloys have widespread industrial applications. However, most commercially available high-strength Al alloys, like AA7075, are not suitable for additive manufacturing due to their high susceptibility to solidification cracking. In this work, a custom Al alloy Al92Ti2Fe2Co2Ni2 was fabricated by selective laser melting. Heterogeneous nanoscale medium-entropy intermetallic lamella form in the as-printed Al alloy. Macroscale compression tests reveal a combination of high strength, over 900 MPa, and prominent plastic deformability. Micropillar compression tests display significant back stress in all regions, and certain regions have flow stresses exceeding 1 GPa. Post-deformation TEM analyses surprisingly reveal that, in addition to abundant dislocation activities in Al matrix, complex dislocation structures and stacking faults form in monoclinic Al9Co2 type brittle intermetallics. This study shows that proper introduction of heterogeneous microstructures and nanoscale medium entropy intermetallics offer an alternative solution to the design of ultrastrong, deformable Al alloys via additive manufacturing.

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Section: Discussionsupporting

confidence: 87%

RETRACTED: Additive manufacturing of an ultrastrong, deformable Al alloy with nanoscale intermetallics

Zhang

Shang

Stegman

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…The cruciform geometry of Al 3 Ti core in Fig. 2 correlates well with literature reports on typical morphology characteristics of trialuminides 43 , 44 . L1 2 Al 3 Ti can also be fabricated via mechanical alloying with or without a ternary element 30 , 45 .…”

Section: Discussionsupporting

confidence: 86%

Additive manufacturing of an ultrastrong, deformable Al alloy with nanoscale intermetallics

Shang,

Stegman,

Choy

et al. 2024

Nat Commun

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Light-weight, high-strength, aluminum (Al) alloys have widespread industrial applications. However, most commercially available high-strength Al alloys, like AA 7075, are not suitable for additive manufacturing due to their high susceptibility to solidification cracking. In this work, a custom Al alloy Al92Ti2Fe2Co2Ni2 is fabricated by selective laser melting. Heterogeneous nanoscale medium-entropy intermetallic lamella form in the as-printed Al alloy. Macroscale compression tests reveal a combination of high strength, over 700 MPa, and prominent plastic deformability. Micropillar compression tests display significant back stress in all regions, and certain regions have flow stresses exceeding 900 MPa. Post-deformation analyses reveal that, in addition to abundant dislocation activities in Al matrix, complex dislocation structures and stacking faults form in monoclinic Al9Co2 type brittle intermetallics. This study shows that proper introduction of heterogeneous microstructures and nanoscale medium entropy intermetallics offer an alternative solution to the design of ultrastrong, deformable Al alloys via additive manufacturing.

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“…This suggestion is supported indirectly by the fact that the mean grain sizes in the alloys of the Al-Zr-Sc-Hf system (alloys #5 and 6) after annealing at 400 °C for 2 h appeared larger essentially than the ones in the alloys of the Al-0.25%Zr-0.1%Sc composition (~150–200 μm) and in the Al-0.25%Zr-0.1%Hf one (~200 μm). In our opinion, this means that the additional alloying of the Sc-containing Al alloys by Hf leads to formation of the incoherent Al 3 (Sc,Hf) particles during annealing (see [ 42 , 43 ]). The fast growth of the Al 3 (Sc,Hf) non-coherent particles will lead to an intensive grain boundary migration and, as a consequence, to the formation of more coarse-grained microstructure in the course of annealing that was observed in the experiment.…”

Section: Discussionmentioning

confidence: 99%

Investigation of Thermal Stability of Microstructure and Mechanical Properties of Bimetallic Fine-Grained Wires from Al–0.25%Zr–(Sc,Hf) Alloys

et al. 2021

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Thermal stability of composite bimetallic wires from five novel microalloyed aluminum alloys with different contents of alloying elements (Zr, Sc, and Hf) is investigated. The alloy workpieces were obtained by induction-casting in a vacuum, preliminary severe plastic deformation, and annealing providing the formation of a uniform microstructure and the nucleation of stabilizing intermetallide Al3(Zr,Sc,Hf) nanoparticles. The wires of 0.26 mm in diameter were obtained by simultaneous deformation of the Al alloy with Cu shell. The bimetallic wires demonstrated high strength and improved thermal stability. After annealing at 450–500 °C, a uniform fine-grained microstructure formed in the wire (the mean grain sizes in the annealed Al wires are 3–5 μm). An increased hardness and strength due to nucleation of the Al3(Sc,Hf) particles was observed. A diffusion of Cu from the shell into the surface layers of the Al wire was observed when heating up to 400–450 °C. The Cu diffusion depth into the annealed Al wire surfaces reached 30–40 μm. The maximum elongation to failure of the wires (20–30%) was achieved after annealing at 350 °C. The maximum values of microhardness (Hv = 500–520 MPa) and of ultimate strength (σb = 195–235 MPa) after annealing at 500 °C were observed for the wires made from the Al alloys alloyed with 0.05–0.1% Sc.

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Formation of Metastable Aluminides in Al–Sc–Ti (Zr, Hf) Cast Alloys

Cited by 14 publications

References 27 publications

RETRACTED: Additive manufacturing of an ultrastrong, deformable Al alloy with nanoscale intermetallics

RETRACTED: Additive manufacturing of an ultrastrong, deformable Al alloy with nanoscale intermetallics

Additive manufacturing of an ultrastrong, deformable Al alloy with nanoscale intermetallics

Investigation of Thermal Stability of Microstructure and Mechanical Properties of Bimetallic Fine-Grained Wires from Al–0.25%Zr–(Sc,Hf) Alloys

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